New structure (#7)

pkg/models/list_users_create.go

@@ -0,0 +1,40 @@
+package models
+
+// Create creates a new list <-> user relation
+func (ul *ListUser) Create(u *User) (err error) {
+
+	// Check if the right is valid
+	if err := ul.Right.isValid(); err != nil {
+		return err
+	}
+
+	// Check if the list exists
+	l := &List{ID: ul.ListID}
+	if err = l.GetSimpleByID(); err != nil {
+		return
+	}
+
+	// Check if the user exists
+	if _, err = GetUserByID(ul.UserID); err != nil {
+		return err
+	}
+
+	// Check if the user already has access or is owner of that list
+	// We explicitly DONT check for teams here
+	if l.OwnerID == ul.UserID {
+		return ErrUserAlreadyHasAccess{UserID: ul.UserID, ListID: ul.ListID}
+	}
+
+	exist, err := x.Where("list_id = ? AND user_id = ?", ul.ListID, ul.UserID).Get(&ListUser{})
+	if err != nil {
+		return
+	}
+	if exist {
+		return ErrUserAlreadyHasAccess{UserID: ul.UserID, ListID: ul.ListID}
+	}
+
+	// Insert user <-> list relation
+	_, err = x.Insert(ul)
+
+	return
+}