module ResolvableDiscussion extend ActiveSupport::Concern included do # A number of properties of this `Discussion`, like `first_note` and `resolvable?`, are memoized. # When this discussion is resolved or unresolved, the values of these properties potentially change. # To make sure all memoized values are reset when this happens, `update` resets all instance variables with names in # `memoized_variables`. If you add a memoized method in `ResolvableDiscussion` or any `Discussion` subclass, # please make sure the instance variable name is added to `memoized_values`, like below. cattr_accessor :memoized_values, instance_accessor: false do [] end memoized_values.push( :resolvable, :resolved, :first_note, :first_note_to_resolve, :last_resolved_note, :last_note ) delegate :potentially_resolvable?, to: :first_note delegate :resolved_at, :resolved_by, to: :last_resolved_note, allow_nil: true end def resolvable? return @resolvable if @resolvable.present? @resolvable = potentially_resolvable? && notes.any?(&:resolvable?) end def resolved? return @resolved if @resolved.present? @resolved = resolvable? && notes.none?(&:to_be_resolved?) end def first_note @first_note ||= notes.first end def first_note_to_resolve return unless resolvable? @first_note_to_resolve ||= notes.find(&:to_be_resolved?) end def last_resolved_note return unless resolved? @last_resolved_note ||= resolved_notes.sort_by(&:resolved_at).last end def resolved_notes notes.select(&:resolved?) end def to_be_resolved? resolvable? && !resolved? end def can_resolve?(current_user) return false unless current_user return false unless resolvable? current_user == self.noteable.author || current_user.can?(:resolve_note, self.project) end def resolve!(current_user) return unless resolvable? update { |notes| notes.resolve!(current_user) } end def unresolve! return unless resolvable? update { |notes| notes.unresolve! } end private def update # Do not select `Note.resolvable`, so that system notes remain in the collection notes_relation = Note.where(id: notes.map(&:id)) yield(notes_relation) # Set the notes array to the updated notes @notes = notes_relation.fresh.to_a self.class.memoized_values.each do |var| instance_variable_set(:"@#{var}", nil) end end end