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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
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