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# frozen_string_literal: true
# == IssuableLink concern
#
# Contains common functionality shared between related Issues and related Epics
#
# Used by IssueLink, Epic::RelatedEpicLink
#
module IssuableLink
extend ActiveSupport::Concern
TYPE_RELATES_TO = 'relates_to'
TYPE_BLOCKS = 'blocks' ## EE-only. Kept here to be used on link_type enum.
class_methods do
def inverse_link_type(type)
type
end
def issuable_type
raise NotImplementedError
end
def issuable_name
issuable_type.to_s.humanize(capitalize: false)
end
# Used to get the available types for the API
# overriden in EE
def available_link_types
[TYPE_RELATES_TO]
end
end
included do
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_or_target, ->(issuable) { where(source: issuable).or(where(target: issuable)) }
enum link_type: { TYPE_RELATES_TO => 0, TYPE_BLOCKS => 1 }
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 self.class.base_class.find_by(source: target, target: source)
errors.add(:source, "is already related to this #{self.class.issuable_name}")
end
end
end
end
IssuableLink.prepend_mod_with('IssuableLink')
IssuableLink::ClassMethods.prepend_mod_with('IssuableLink::ClassMethods')
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