Implemented savePreferences API

pkg/models/preferences.go

@@ -9,20 +9,18 @@ var (
 	ErrPreferenceNotFound = errors.New("Preference not found")
 )
 
-type Preference struct {
-	Id            int64
-	PrefId        int64
-	PrefType      string
-	PrefData      map[string]interface{}
+type Preferences struct {
+	Id       int64
+	PrefId   int64
+	PrefType string
+	PrefData map[string]interface{}
 }
 
 // ---------------------
 // COMMANDS
 
-type SavePreferenceCommand struct {
-	
-  PrefData map[string]interface{} `json:"prefData"`
-  PrefId   int64                  `json:"-"`
+type SavePreferencesCommand struct {
+	PrefData map[string]interface{} `json:"prefData" binding:"Required"`
+	PrefId   int64                  `json:"-"`
 	PrefType string                 `json:"-"`
-
 }