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class="breadcrumbs__link" href="/"><svg viewBox="0 0 24 24" class="breadcrumbHomeIcon_YNFT"><path d="M10 19v-5h4v5c0 .55.45 1 1 1h3c.55 0 1-.45 1-1v-7h1.7c.46 0 .68-.57.33-.87L12.67 3.6c-.38-.34-.96-.34-1.34 0l-8.36 7.53c-.34.3-.13.87.33.87H5v7c0 .55.45 1 1 1h3c.55 0 1-.45 1-1z" fill="currentColor"></path></svg></a></li><li itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item"><a class="breadcrumbs__link" itemprop="item" href="/docs/projects/cms"><span itemprop="name">CMS</span></a><meta itemprop="position" content="1"></li><li itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item"><a class="breadcrumbs__link" itemprop="item" href="/docs/projects/cms/gocontentful"><span itemprop="name">Gocontentful</span></a><meta itemprop="position" content="2"></li><li itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item breadcrumbs__item--active"><span class="breadcrumbs__link" itemprop="name">Play with the test API</span><meta itemprop="position" content="3"></li></ul></nav><div class="theme-doc-markdown markdown"><h1>Play with the test API</h1><p>Clone the gocontentful repository from <!-- -->[github.com/foomo/gocontentful]<!-- --> and open it
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in your IDE. </p><p>The repository includes an offline representation of a Contentful space that can is used for testing gocontentful
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without depending on an online connection and an existing Contentful space. </p><p>Create a file in the repository home directory and name it <code>untracked_test.go</code>. This ensures it's not tracked by git.
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Paste the following into the file:</p><div class="language-go codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-go codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token keyword" style="font-style:italic">package</span><span class="token plain"> main</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"></span><span class="token keyword" style="font-style:italic">import</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"testing"</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"github.com/foomo/gocontentful/test"</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"github.com/foomo/gocontentful/test/testapi"</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"github.com/sirupsen/logrus"</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"github.com/stretchr/testify/require"</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"></span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"></span><span class="token keyword" style="font-style:italic">func</span><span class="token plain"> </span><span class="token function" style="color:rgb(130, 170, 255)">TestTheAPI</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token plain">t </span><span class="token operator" style="color:rgb(137, 221, 255)">*</span><span class="token plain">testing</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token plain">T</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> testLogger </span><span class="token operator" style="color:rgb(137, 221, 255)">:=</span><span class="token plain"> logrus</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token function" style="color:rgb(130, 170, 255)">StandardLogger</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> cc</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"> errClient </span><span class="token operator" style="color:rgb(137, 221, 255)">:=</span><span class="token plain"> testapi</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token function" style="color:rgb(130, 170, 255)">NewOfflineContentfulClient</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token string" style="color:rgb(195, 232, 141)">"./test/test-space-export.json"</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> test</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token function" style="color:rgb(130, 170, 255)">GetContenfulLogger</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token plain">testLogger</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> test</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token plain">LogDebug</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token boolean" style="color:rgb(255, 88, 116)">true</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> require</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token function" style="color:rgb(130, 170, 255)">NoError</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token plain">t</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"> errClient</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> prods</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"> errProds </span><span class="token operator" style="color:rgb(137, 221, 255)">:=</span><span class="token plain"> cc</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token function" style="color:rgb(130, 170, 255)">GetAllProduct</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> require</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token function" style="color:rgb(130, 170, 255)">NoError</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token plain">t</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"> errProds</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> testLogger</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token function" style="color:rgb(130, 170, 255)">WithField</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token string" style="color:rgb(195, 232, 141)">"prods"</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"> </span><span class="token function" style="color:rgb(130, 170, 255)">len</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token plain">prods</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token function" style="color:rgb(130, 170, 255)">Info</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token string" style="color:rgb(195, 232, 141)">"Loaded products"</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"></span><span class="token punctuation" style="color:rgb(199, 146, 234)">}</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg class="copyButtonIcon_y97N" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>The first two lines in the unit test create a logger and an offline gocontentful client. This also
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caches the content of the space in memory and lets you play with the API. The space includes three
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content types (<code>brand</code>, <code>product</code> and <code>category</code>) and their relative entries.
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A product has a reference to a brand and to one or more categories. If you open the <code>./test/test-space-export.json</code> file
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you can see how the JSON representation of those entries is. </p><p>Getting all the products using the Contentful
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Content Delivery API would normally require dealing with the connection, query and JSON payload, having
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value object defined for all content types and functions to convert from/to those structs. With the Go API generated
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by gocontentful all you need to do to load all the products looks like this single line:</p><div class="language-go codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-go codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token plain"> prods</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"> errProds </span><span class="token operator" style="color:rgb(137, 221, 255)">:=</span><span class="token plain"> cc</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token function" style="color:rgb(130, 170, 255)">GetAllProduct</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg class="copyButtonIcon_y97N" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>Open a terminal and from the repository home directory run the test. Your output should looks similar to this:</p><div class="language-shell codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-shell codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token plain">$ go </span><span class="token builtin class-name" style="color:rgb(255, 203, 107)">test</span><span class="token plain"> -run TestTheAPI</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">INFO</span><span class="token punctuation" style="color:rgb(199, 146, 234)">[</span><span class="token plain">0000</span><span class="token punctuation" style="color:rgb(199, 146, 234)">]</span><span class="token plain"> loading space from </span><span class="token builtin class-name" style="color:rgb(255, 203, 107)">local</span><span class="token plain"> </span><span class="token function" style="color:rgb(130, 170, 255)">file</span><span class="token plain"> </span><span class="token assign-left variable" style="color:rgb(191, 199, 213)">assets</span><span class="token operator" style="color:rgb(137, 221, 255)">=</span><span class="token number" style="color:rgb(247, 140, 108)">12</span><span class="token plain"> </span><span class="token assign-left variable" style="color:rgb(191, 199, 213)">entries</span><span class="token operator" style="color:rgb(137, 221, 255)">=</span><span class="token number" style="color:rgb(247, 140, 108)">9</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">INFO</span><span class="token punctuation" style="color:rgb(199, 146, 234)">[</span><span class="token plain">0000</span><span class="token punctuation" style="color:rgb(199, 146, 234)">]</span><span class="token plain"> contentful cache update queued </span><span class="token assign-left variable" style="color:rgb(191, 199, 213)">task</span><span class="token operator" style="color:rgb(137, 221, 255)">=</span><span class="token plain">UpdateCache</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">INFO</span><span class="token punctuation" style="color:rgb(199, 146, 234)">[</span><span class="token plain">0000</span><span class="token punctuation" style="color:rgb(199, 146, 234)">]</span><span class="token plain"> contentful cache worker starting </span><span class="token assign-left variable" style="color:rgb(191, 199, 213)">task</span><span class="token operator" style="color:rgb(137, 221, 255)">=</span><span class="token plain">UpdateCache</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">INFO</span><span class="token punctuation" style="color:rgb(199, 146, 234)">[</span><span class="token plain">0000</span><span class="token punctuation" style="color:rgb(199, 146, 234)">]</span><span class="token plain"> gonna use a </span><span class="token builtin class-name" style="color:rgb(255, 203, 107)">local</span><span class="token plain"> </span><span class="token function" style="color:rgb(130, 170, 255)">file</span><span class="token plain"> </span><span class="token assign-left variable" style="color:rgb(191, 199, 213)">task</span><span class="token operator" style="color:rgb(137, 221, 255)">=</span><span class="token plain">UpdateCache</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">INFO</span><span class="token punctuation" style="color:rgb(199, 146, 234)">[</span><span class="token plain">0000</span><span class="token punctuation" style="color:rgb(199, 146, 234)">]</span><span class="token plain"> cached all entries of content </span><span class="token builtin class-name" style="color:rgb(255, 203, 107)">type</span><span class="token plain"> </span><span class="token assign-left variable" style="color:rgb(191, 199, 213)">contentType</span><span class="token operator" style="color:rgb(137, 221, 255)">=</span><span class="token plain">product </span><span class="token assign-left variable" style="color:rgb(191, 199, 213)">method</span><span class="token operator" style="color:rgb(137, 221, 255)">=</span><span class="token plain">updateCacheForContentType </span><span class="token assign-left variable" style="color:rgb(191, 199, 213)">size</span><span class="token operator" style="color:rgb(137, 221, 255)">=</span><span class="token number" style="color:rgb(247, 140, 108)">4</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">INFO</span><span class="token punctuation" style="color:rgb(199, 146, 234)">[</span><span class="token plain">0000</span><span class="token punctuation" style="color:rgb(199, 146, 234)">]</span><span class="token plain"> cached all assets </span><span class="token assign-left variable" style="color:rgb(191, 199, 213)">contentType</span><span class="token operator" style="color:rgb(137, 221, 255)">=</span><span class="token plain">asset </span><span class="token assign-left variable" style="color:rgb(191, 199, 213)">method</span><span class="token operator" style="color:rgb(137, 221, 255)">=</span><span class="token plain">updateCacheForContentType </span><span class="token assign-left variable" style="color:rgb(191, 199, 213)">size</span><span class="token operator" style="color:rgb(137, 221, 255)">=</span><span class="token number" style="color:rgb(247, 140, 108)">12</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">INFO</span><span class="token punctuation" style="color:rgb(199, 146, 234)">[</span><span class="token plain">0000</span><span class="token punctuation" style="color:rgb(199, 146, 234)">]</span><span class="token plain"> cached all entries of content </span><span class="token builtin class-name" style="color:rgb(255, 203, 107)">type</span><span class="token plain"> </span><span class="token assign-left variable" style="color:rgb(191, 199, 213)">contentType</span><span class="token operator" style="color:rgb(137, 221, 255)">=</span><span class="token plain">brand </span><span class="token assign-left variable" style="color:rgb(191, 199, 213)">method</span><span class="token operator" style="color:rgb(137, 221, 255)">=</span><span class="token plain">updateCacheForContentType </span><span class="token assign-left variable" style="color:rgb(191, 199, 213)">size</span><span class="token operator" style="color:rgb(137, 221, 255)">=</span><span class="token number" style="color:rgb(247, 140, 108)">3</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">INFO</span><span class="token punctuation" style="color:rgb(199, 146, 234)">[</span><span class="token plain">0000</span><span class="token punctuation" style="color:rgb(199, 146, 234)">]</span><span class="token plain"> cached all entries of content </span><span class="token builtin class-name" style="color:rgb(255, 203, 107)">type</span><span class="token plain"> </span><span class="token assign-left variable" style="color:rgb(191, 199, 213)">contentType</span><span class="token operator" style="color:rgb(137, 221, 255)">=</span><span class="token plain">category </span><span class="token assign-left variable" style="color:rgb(191, 199, 213)">method</span><span class="token operator" style="color:rgb(137, 221, 255)">=</span><span class="token plain">updateCacheForContentType </span><span class="token assign-left variable" style="color:rgb(191, 199, 213)">size</span><span class="token operator" style="color:rgb(137, 221, 255)">=</span><span class="token number" style="color:rgb(247, 140, 108)">2</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">INFO</span><span class="token punctuation" style="color:rgb(199, 146, 234)">[</span><span class="token plain">0000</span><span class="token punctuation" style="color:rgb(199, 146, 234)">]</span><span class="token plain"> space caching done, </span><span class="token function" style="color:rgb(130, 170, 255)">time</span><span class="token plain"> recorded </span><span class="token assign-left variable" style="color:rgb(191, 199, 213)">task</span><span class="token operator" style="color:rgb(137, 221, 255)">=</span><span class="token plain">UpdateCache </span><span class="token function" style="color:rgb(130, 170, 255)">time</span><span class="token plain"> </span><span class="token assign-left variable" style="color:rgb(191, 199, 213)">elapsed</span><span class="token operator" style="color:rgb(137, 221, 255)">=</span><span class="token number" style="color:rgb(247, 140, 108)">179</span><span class="token plain">.357792ms</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">INFO</span><span class="token punctuation" style="color:rgb(199, 146, 234)">[</span><span class="token plain">0000</span><span class="token punctuation" style="color:rgb(199, 146, 234)">]</span><span class="token plain"> contentful cache update returning </span><span class="token assign-left variable" style="color:rgb(191, 199, 213)">task</span><span class="token operator" style="color:rgb(137, 221, 255)">=</span><span class="token plain">UpdateCache</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">INFO</span><span class="token punctuation" style="color:rgb(199, 146, 234)">[</span><span class="token plain">0000</span><span class="token punctuation" style="color:rgb(199, 146, 234)">]</span><span class="token plain"> contentful cache update returning </span><span class="token assign-left variable" style="color:rgb(191, 199, 213)">task</span><span class="token operator" style="color:rgb(137, 221, 255)">=</span><span class="token plain">UpdateCache</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">INFO</span><span class="token punctuation" style="color:rgb(199, 146, 234)">[</span><span class="token plain">0000</span><span class="token punctuation" style="color:rgb(199, 146, 234)">]</span><span class="token plain"> Loaded products </span><span class="token assign-left variable" style="color:rgb(191, 199, 213)">prods</span><span class="token operator" style="color:rgb(137, 221, 255)">=</span><span class="token number" style="color:rgb(247, 140, 108)">4</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">PASS</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">ok github.com/foomo/gocontentful </span><span class="token number" style="color:rgb(247, 140, 108)">0</span><span class="token plain">.484s</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg class="copyButtonIcon_y97N" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>The last line shows that we loaded 4 products. Let's go ahead and play with the API.
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We'll load a specific product and log its name. Add this at the end of the unit test:</p><div class="language-go codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-go codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token plain">prod</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"> errProd </span><span class="token operator" style="color:rgb(137, 221, 255)">:=</span><span class="token plain"> cc</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token function" style="color:rgb(130, 170, 255)">GetProductByID</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token string" style="color:rgb(195, 232, 141)">"6dbjWqNd9SqccegcqYq224"</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">require</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token function" style="color:rgb(130, 170, 255)">NoError</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token plain">t</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"> errProd</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">prodName </span><span class="token operator" style="color:rgb(137, 221, 255)">:=</span><span class="token plain"> prod</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token function" style="color:rgb(130, 170, 255)">ProductName</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token string" style="color:rgb(195, 232, 141)">"de"</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">testLogger</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token function" style="color:rgb(130, 170, 255)">WithField</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token string" style="color:rgb(195, 232, 141)">"name"</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"> prodName</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token function" style="color:rgb(130, 170, 255)">Info</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token string" style="color:rgb(195, 232, 141)">"Product loaded"</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg class="copyButtonIcon_y97N" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>This will be the output at the end of the log when you run the test:</p><div class="language-shell codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-shell codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token plain">INFO</span><span class="token punctuation" style="color:rgb(199, 146, 234)">[</span><span class="token plain">0000</span><span class="token punctuation" style="color:rgb(199, 146, 234)">]</span><span class="token plain"> Product loaded </span><span class="token assign-left variable" style="color:rgb(191, 199, 213)">name</span><span class="token operator" style="color:rgb(137, 221, 255)">=</span><span class="token string" style="color:rgb(195, 232, 141)">"Whisk Beater"</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg class="copyButtonIcon_y97N" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>The first line loads the product from the space. This is a <code>*testapi.CfProduct</code> pointer. The type is generated
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and carries all the getter and setter methods to access all the fields and more, e.g. ProductName().
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Note that when calling ProductName() we passed <code>"de"</code> as a parameter. This is the locale and it's
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entirely optional and useful when your space supports multiple locales for translation.
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If you omit it, the default space locale will be used.</p><p>Let's load the product's brand:</p><div class="language-go codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-go codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token comment" style="color:rgb(105, 112, 152);font-style:italic">// Get the brand</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">brandReference </span><span class="token operator" style="color:rgb(137, 221, 255)">:=</span><span class="token plain"> prod</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token function" style="color:rgb(130, 170, 255)">Brand</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">brand </span><span class="token operator" style="color:rgb(137, 221, 255)">:=</span><span class="token plain"> brandReference</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token plain">VO</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token operator" style="color:rgb(137, 221, 255)">*</span><span class="token plain">testapi</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token plain">CfBrand</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">testLogger</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token function" style="color:rgb(130, 170, 255)">WithField</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token string" style="color:rgb(195, 232, 141)">"name"</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"> brand</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token function" style="color:rgb(130, 170, 255)">CompanyName</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token function" style="color:rgb(130, 170, 255)">Info</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token string" style="color:rgb(195, 232, 141)">"Brand"</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg class="copyButtonIcon_y97N" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>Note a couple of things here:</p><ul><li>The product has a Brand() method that represents and retrieves the reference from the product entry to the brand entry</li><li>The returned object is not a <code>*testapi.CfBrand</code> pointer as you might expect. This is because a reference field in Contentful
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can point to entries of multiple content types and that doesn't play nice with Go's static typing.
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The object returned is a generic <code>*testapi.EntryReference</code> that, among other, includes an <code>interface{}</code> attribute (VO) that
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is the actual <code>*testapi.CfBrand</code>. That's why in the second line we had to cast it.</li></ul><p>The test now logs the brand company name:</p><div class="language-shell codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-shell codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token plain">INFO</span><span class="token punctuation" style="color:rgb(199, 146, 234)">[</span><span class="token plain">0000</span><span class="token punctuation" style="color:rgb(199, 146, 234)">]</span><span class="token plain"> Brand </span><span class="token assign-left variable" style="color:rgb(191, 199, 213)">name</span><span class="token operator" style="color:rgb(137, 221, 255)">=</span><span class="token string" style="color:rgb(195, 232, 141)">"Normann Copenhagen"</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg class="copyButtonIcon_y97N" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>What if we want to follow the reference the other way around and find out which entries link to this brand?</p><div class="language-go codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-go codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token plain">parentRefs</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"> errParents </span><span class="token operator" style="color:rgb(137, 221, 255)">:=</span><span class="token plain"> brand</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token function" style="color:rgb(130, 170, 255)">GetParents</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">require</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token function" style="color:rgb(130, 170, 255)">NoError</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token plain">t</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"> errParents</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">testLogger</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token function" style="color:rgb(130, 170, 255)">WithField</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token string" style="color:rgb(195, 232, 141)">"parent count"</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"> </span><span class="token function" style="color:rgb(130, 170, 255)">len</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token plain">parentRefs</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token function" style="color:rgb(130, 170, 255)">Info</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token string" style="color:rgb(195, 232, 141)">"Parents"</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"></span><span class="token keyword" style="font-style:italic">for</span><span class="token plain"> </span><span class="token boolean" style="color:rgb(255, 88, 116)">_</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"> parentRef </span><span class="token operator" style="color:rgb(137, 221, 255)">:=</span><span class="token plain"> </span><span class="token keyword" style="font-style:italic">range</span><span class="token plain"> parentRefs </span><span class="token punctuation" style="color:rgb(199, 146, 234)">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token keyword" style="font-style:italic">switch</span><span class="token plain"> parentRef</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token plain">ContentType </span><span class="token punctuation" style="color:rgb(199, 146, 234)">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token keyword" style="font-style:italic">case</span><span class="token plain"> testapi</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token plain">ContentTypeProduct</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> parentProduct </span><span class="token operator" style="color:rgb(137, 221, 255)">:=</span><span class="token plain"> parentRef</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token plain">VO</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token operator" style="color:rgb(137, 221, 255)">*</span><span class="token plain">testapi</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token plain">CfProduct</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> testLogger</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token function" style="color:rgb(130, 170, 255)">WithField</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token string" style="color:rgb(195, 232, 141)">"name"</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"> parentProduct</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token function" style="color:rgb(130, 170, 255)">ProductName</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token function" style="color:rgb(130, 170, 255)">Info</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token string" style="color:rgb(195, 232, 141)">"Parent product"</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">}</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"></span><span class="token punctuation" style="color:rgb(199, 146, 234)">}</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg class="copyButtonIcon_y97N" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>Again, the <code>GetParents()</code> method returns references and not objects. It's a good idea to use the reference <code>ContentType</code> attribute
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to switch before casting the VO to the type, because as we just said referenced objects can come in different types and casting
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to the wrong one would make the runtime panic. Running the test we find out the two products that belong to this brand:</p><div class="language-shell codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-shell codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token plain">INFO</span><span class="token punctuation" style="color:rgb(199, 146, 234)">[</span><span class="token plain">0000</span><span class="token punctuation" style="color:rgb(199, 146, 234)">]</span><span class="token plain"> Parents parent </span><span class="token assign-left variable" style="color:rgb(191, 199, 213)">count</span><span class="token operator" style="color:rgb(137, 221, 255)">=</span><span class="token number" style="color:rgb(247, 140, 108)">2</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">INFO</span><span class="token punctuation" style="color:rgb(199, 146, 234)">[</span><span class="token plain">0000</span><span class="token punctuation" style="color:rgb(199, 146, 234)">]</span><span class="token plain"> Parent product </span><span class="token assign-left variable" style="color:rgb(191, 199, 213)">name</span><span class="token operator" style="color:rgb(137, 221, 255)">=</span><span class="token string" style="color:rgb(195, 232, 141)">"Whisk Beater"</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">INFO</span><span class="token punctuation" style="color:rgb(199, 146, 234)">[</span><span class="token plain">0000</span><span class="token punctuation" style="color:rgb(199, 146, 234)">]</span><span class="token plain"> Parent product </span><span class="token assign-left variable" style="color:rgb(191, 199, 213)">name</span><span class="token operator" style="color:rgb(137, 221, 255)">=</span><span class="token string" style="color:rgb(195, 232, 141)">"Hudson Wall Cup"</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg class="copyButtonIcon_y97N" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div></div><footer class="theme-doc-footer docusaurus-mt-lg"><div class="theme-doc-footer-edit-meta-row row"><div class="col"><a href="https://github.com/foomo/foomo-docs/tree/main/foomo/docs/projects/cms/gocontentful/03-test-api.md" target="_blank" rel="noreferrer noopener" class="theme-edit-this-page"><svg fill="currentColor" height="20" width="20" viewBox="0 0 40 40" class="iconEdit_Z9Sw" aria-hidden="true"><g><path d="m34.5 11.7l-3 3.1-6.3-6.3 3.1-3q0.5-0.5 1.2-0.5t1.1 0.5l3.9 3.9q0.5 0.4 0.5 1.1t-0.5 1.2z m-29.5 17.1l18.4-18.5 6.3 6.3-18.4 18.4h-6.3v-6.2z"></path></g></svg>Edit this page</a></div><div class="col lastUpdated_vwxv"></div></div></footer></article><nav class="pagination-nav docusaurus-mt-lg" aria-label="Docs pages navigation"><a class="pagination-nav__link pagination-nav__link--prev" href="/docs/projects/cms/gocontentful/getting-started"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">Getting started</div></a><a class="pagination-nav__link pagination-nav__link--next" href="/docs/projects/cms/gocontentful/working-with-gocontentful-api"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">Working with the Gocontentful API</div></a></nav></div></div></div></div></main></div></div><footer class="footer"><div class="container container-fluid"><div class="row footer__links"><div class="col footer__col"><div class="footer__title">github</div><ul class="footer__items clean-list"><li class="footer__item"><a href="https://github.com/foomo" target="_blank" rel="noopener noreferrer" class="footer__link-item">https://github.com/foomo</a></li></ul></div><div class="col footer__col"><div class="footer__title">legal</div><ul class="footer__items clean-list"><li class="footer__item"><a class="footer__link-item" href="/etc/imprint">Imprint</a></li></ul></div></div><div class="footer__bottom text--center"><div class="footer__copyright">© 2023 bestbytes</div></div></div></footer></div>
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