Added error type for no item title

models/error.go

@@ -78,4 +78,17 @@ func (err ErrAuthorCannotBeEmpty) Error() string {
 	return fmt.Sprintf("author cannot be empty")
 }
 
+// ErrItemTitleCannotBeEmpty represents a "ErrItemTitleCannotBeEmpty" kind of error.
+type ErrItemTitleCannotBeEmpty struct {}
+
+// IsErrItemTitleCannotBeEmpty checks if an error is a ErrItemTitleCannotBeEmpty.
+func IsErrItemTitleCannotBeEmpty(err error) bool {
+	_, ok := err.(ErrItemTitleCannotBeEmpty)
+	return ok
+}
+
+func (err ErrItemTitleCannotBeEmpty) Error() string {
+	return fmt.Sprintf("title cannot be empty")
+}
+
 

models/item_test.go

@@ -53,6 +53,7 @@ func TestAddOrUpdateItem(t *testing.T) {
 	// Pass an empty item to see if it fails
 	_, err = AddOrUpdateItem(Item{})
 	assert.Error(t, err)
+	assert.True(t, IsErrItemTitleCannotBeEmpty(err))
 
 	// Update the item
 	testitem.ID = item1.ID

models/items_add_update.go

@@ -1,7 +1,5 @@
 package models
 
-import "fmt"
-
 // AddOrUpdateItem adds or updates a item from a item struct
 func AddOrUpdateItem(item Item) (newItem Item, err error) {
 	// save the quantity for later use
@@ -9,7 +7,7 @@ func AddOrUpdateItem(item Item) (newItem Item, err error) {
 
 	if item.ID == 0 {
 		if item.Title == "" { // Only insert it if the title is not empty
-			return Item{}, fmt.Errorf("You need at least a title to create an item")
+			return Item{}, ErrItemTitleCannotBeEmpty{}
 		}
 
 		_, err = x.Insert(&item)

routes/api/v1/items_add_update.go

@@ -57,6 +57,9 @@ func ItemAddOrUpdate(c echo.Context) error {
 	newItem, err := models.AddOrUpdateItem(*datItem)
 
 	if err != nil {
+		if models.IsErrItemTitleCannotBeEmpty(err) {
+			return c.JSON(http.StatusInternalServerError, models.Message{"Please provide at least a title for the item."})
+		}
 		return c.JSON(http.StatusInternalServerError, models.Message{"Error"})
 	}