From e8935ddff9f6637dcdb313f25fa0c8f582c91c8d Mon Sep 17 00:00:00 2001
From: Florian Schlegel <florian.schlegel@bestbytes.com>
Date: Tue, 14 Feb 2017 11:23:11 +0100
Subject: [PATCH] implemented NewPersistorWithIndex() and test

---
 persistence/persistence.go      | 12 ++++++++
 persistence/persistence_test.go | 53 +++++++++++++++++++++++++++++++++
 2 files changed, 65 insertions(+)
 create mode 100644 persistence/persistence_test.go

diff --git a/persistence/persistence.go b/persistence/persistence.go
index 7442337..8c048d8 100644
--- a/persistence/persistence.go
+++ b/persistence/persistence.go
@@ -24,6 +24,18 @@ type Persistor struct {
 // ~ CONSTRUCTOR
 //------------------------------------------------------------------
 
+func NewPersistorWithIndex(mongoURL string, collection string, index mgo.Index) (p *Persistor, err error) {
+	p, err = NewPersistor(mongoURL, collection)
+	if err != nil {
+		return
+	}
+	err = p.GetCollection().EnsureIndex(index)
+	if err != nil {
+		return
+	}
+	return p, nil
+}
+
 // NewPersistor constructor
 func NewPersistor(mongoURL string, collection string) (p *Persistor, err error) {
 	parsedURL, err := url.Parse(mongoURL)
diff --git a/persistence/persistence_test.go b/persistence/persistence_test.go
new file mode 100644
index 0000000..0bade22
--- /dev/null
+++ b/persistence/persistence_test.go
@@ -0,0 +1,53 @@
+package persistence
+
+import (
+	"testing"
+
+	"gopkg.in/mgo.v2"
+)
+
+type Foo struct {
+	FirstName string
+	LastName  string
+}
+
+func TestPersistenceIndex(t *testing.T) {
+	index := mgo.Index{
+		Key:        []string{"firstname", "lastname"},
+		Unique:     true,
+		Background: true,
+	}
+	p, err := NewPersistorWithIndex("mongodb://dockerhost/test", "testindex", index)
+	if err != nil {
+		t.Fatal(err)
+	}
+	err = p.GetCollection().EnsureIndex(index)
+	if err != nil {
+		t.Fatal(err)
+	}
+	err = p.GetCollection().Insert(&Foo{
+		FirstName: "Foo",
+		LastName:  "Bar",
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	err = p.GetCollection().Insert(&Foo{
+		FirstName: "Flo",
+		LastName:  "Bar",
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	err = p.GetCollection().Insert(&Foo{
+		FirstName: "Flo",
+		LastName:  "Bar",
+	})
+	if err == nil {
+		t.Fail()
+		t.Log("Did not expected that one to work!")
+	}
+	if err != nil {
+		t.Log("Error: " + err.Error())
+	}
+}