Made structural changes to server-side Preference code based on feedback

model/client.go

@@ -844,12 +844,12 @@ func (c *Client) ListIncomingWebhooks() (*Result, *AppError) {
 	}
 }
 
-func (c *Client) SetPreferences(preferences []*Preference) (*Result, *AppError) {
-	if r, err := c.DoApiPost("/preferences/set", PreferenceListToJson(preferences)); err != nil {
+func (c *Client) SetPreferences(preferences *Preferences) (*Result, *AppError) {
+	if r, err := c.DoApiPost("/preferences/save", preferences.ToJson()); err != nil {
 		return nil, err
 	} else {
 		return &Result{r.Header.Get(HEADER_REQUEST_ID),
-			r.Header.Get(HEADER_ETAG_SERVER), nil}, nil
+			r.Header.Get(HEADER_ETAG_SERVER), preferences}, nil
 	}
 }
 
@@ -857,8 +857,8 @@ func (c *Client) GetPreferencesByName(category string, name string) (*Result, *A
 	if r, err := c.DoApiGet("/preferences/"+category+"/"+name, "", ""); err != nil {
 		return nil, err
 	} else {
-		return &Result{r.Header.Get(HEADER_REQUEST_ID),
-			r.Header.Get(HEADER_ETAG_SERVER), PreferenceListFromJson(r.Body)}, nil
+		preferences, _ := PreferencesFromJson(r.Body)
+		return &Result{r.Header.Get(HEADER_REQUEST_ID), r.Header.Get(HEADER_ETAG_SERVER), preferences}, nil
 	}
 }