1 files changed, 38 insertions, 0 deletions
diff --git a/app/models/project_label.rb b/app/models/project_label.rb
new file mode 100644
index 00000000000..82f47f0e8fd
--- /dev/null
+++ b/app/models/project_label.rb
@@ -0,0 +1,38 @@
+class ProjectLabel < Label
+  MAX_NUMBER_OF_PRIORITIES = 1
+
+  belongs_to :project
+
+  validates :project, presence: true
+
+  validate :permitted_numbers_of_priorities
+  validate :title_must_not_exist_at_group_level
+
+  delegate :group, to: :project, allow_nil: true
+
+  alias_attribute :subject, :project
+
+  def subject_foreign_key
+    'project_id'
+  end
+
+  def to_reference(target_project = nil, format: :id)
+    super(project, target_project, format: format)
+  end
+
+  private
+
+  def title_must_not_exist_at_group_level
+    return unless group.present? && title_changed?
+
+    if group.labels.with_title(self.title).exists?
+      errors.add(:title, :label_already_exists_at_group_level, group: group.name)
+    end
+  end
+
+  def permitted_numbers_of_priorities
+    if priorities && priorities.size > MAX_NUMBER_OF_PRIORITIES
+      errors.add(:priorities, 'Number of permitted priorities exceeded')
+    end
+  end
+end