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# frozen_string_literal: true
class LabelLink < ApplicationRecord
include BulkInsertSafe
include Importable
include FromUnion
belongs_to :target, polymorphic: true, inverse_of: :label_links # rubocop:disable Cop/PolymorphicAssociations
belongs_to :label
# rubocop:disable Rails/InverseOf -- needed for unified association
belongs_to :own_label, foreign_key: :label_id, class_name: 'Label'
# rubocop:enable Rails/InverseOf
validates :target, presence: true, unless: :importing?
validates :label, presence: true, unless: :importing?
scope :for_target, ->(target_id, target_type) { where(target_id: target_id, target_type: target_type) }
# Example: Issues has at least one label within a project
# > Issue.where(project_id: 100) # or any scope on issues
# > .where(LabelLink.by_target_for_exists_query('Issue', Issue.arel_table[:id]).arel.exists)
scope :by_target_for_exists_query, ->(target_type, arel_join_column, label_ids = nil) do
relation = LabelLink
.where(target_type: target_type)
.where(arel_table['target_id'].eq(arel_join_column)).select("1")
relation = relation.where(label_id: label_ids) if label_ids
relation
end
end
LabelLink.prepend_mod_with('LabelLink')
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