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# == Mentionable concern
#
# Contains functionality related to objects that can mention Users, Issues, MergeRequests, or Commits by
# GFM references.
#
# Used by Issue, Note, MergeRequest, and Commit.
#
module Mentionable
extend ActiveSupport::Concern
module ClassMethods
# Indicate which attributes of the Mentionable to search for GFM references.
def attr_mentionable(*attrs)
mentionable_attrs.concat(attrs.map(&:to_s))
end
# Accessor for attributes marked mentionable.
def mentionable_attrs
@mentionable_attrs ||= []
end
end
# Generate a GFM back-reference that will construct a link back to this Mentionable when rendered. Must
# be overridden if this model object can be referenced directly by GFM notation.
def gfm_reference
raise NotImplementedError.new("#{self.class} does not implement #gfm_reference")
end
# Construct a String that contains possible GFM references.
def mentionable_text
self.class.mentionable_attrs.map { |attr| send(attr) || '' }.join
end
# The GFM reference to this Mentionable, which shouldn't be included in its #references.
def local_reference
self
end
# Determine whether or not a cross-reference Note has already been created between this Mentionable and
# the specified target.
def has_mentioned?(target)
Note.cross_reference_exists?(target, local_reference)
end
def mentioned_users(current_user = nil)
return [] if mentionable_text.blank?
ext = Gitlab::ReferenceExtractor.new(self.project, current_user)
ext.analyze(mentionable_text)
ext.users.uniq
end
# Extract GFM references to other Mentionables from this Mentionable. Always excludes its #local_reference.
def references(p = project, current_user = self.author, text = mentionable_text)
return [] if text.blank?
ext = Gitlab::ReferenceExtractor.new(p, current_user)
ext.analyze(text)
(ext.issues + ext.merge_requests + ext.commits).uniq - [local_reference]
end
# Create a cross-reference Note for each GFM reference to another Mentionable found in +mentionable_text+.
def create_cross_references!(p = project, a = author, without = [])
refs = references(p) - without
refs.each do |ref|
Note.create_cross_reference_note(ref, local_reference, a, p)
end
end
# If the mentionable_text field is about to change, locate any *added* references and create cross references for
# them. Invoke from an observer's #before_save implementation.
def notice_added_references(p = project, a = author)
ch = changed_attributes
original, mentionable_changed = "", false
self.class.mentionable_attrs.each do |attr|
if ch[attr]
original << ch[attr]
mentionable_changed = true
end
end
# Only proceed if the saved changes actually include a chance to an attr_mentionable field.
return unless mentionable_changed
preexisting = references(p, self.author, original)
create_cross_references!(p, a, preexisting)
end
end
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