1 files changed, 14 insertions, 0 deletions
diff --git a/app/models/project_label.rb b/app/models/project_label.rb
index 3e41113e340..1171aa2dbb3 100644
--- a/app/models/project_label.rb
+++ b/app/models/project_label.rb
@@ -2,4 +2,18 @@ class ProjectLabel < Label
   belongs_to :project
 
   validates :project, presence: true
+
+  validate :title_must_not_exist_at_group_level
+
+  delegate :group, to: :project, allow_nil: true
+
+  private
+
+  def title_must_not_exist_at_group_level
+    return unless group.present?
+
+    if group.labels.with_title(self.title).exists?
+      errors.add(:title, :label_already_exists_at_group_level, group: group.name)
+    end
+  end
 end