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# frozen_string_literal: true
class IssueLink < ApplicationRecord
include FromUnion
belongs_to :source, class_name: 'Issue'
belongs_to :target, class_name: 'Issue'
validates :source, presence: true
validates :target, presence: true
validates :source, uniqueness: { scope: :target_id, message: 'is already related' }
validate :check_self_relation
validate :check_opposite_relation
scope :for_source_issue, ->(issue) { where(source_id: issue.id) }
scope :for_target_issue, ->(issue) { where(target_id: issue.id) }
TYPE_RELATES_TO = 'relates_to'
TYPE_BLOCKS = 'blocks'
# we don't store is_blocked_by in the db but need it for displaying the relation
# from the target (used in IssueLink.inverse_link_type)
TYPE_IS_BLOCKED_BY = 'is_blocked_by'
enum link_type: { TYPE_RELATES_TO => 0, TYPE_BLOCKS => 1 }
def self.inverse_link_type(type)
type
end
private
def check_self_relation
return unless source && target
if source == target
errors.add(:source, 'cannot be related to itself')
end
end
def check_opposite_relation
return unless source && target
if IssueLink.find_by(source: target, target: source)
errors.add(:source, 'is already related to this issue')
end
end
end
IssueLink.prepend_mod_with('IssueLink')
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