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sharded_bookmarked_collection.rb
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# frozen_string_literal: true # # Copyright (C) 2014 - present Instructure, Inc. # # This file is part of Canvas. # # Canvas is free software: you can redistribute it and/or modify it under # the terms of the GNU Affero General Public License as published by the Free # Software Foundation, version 3 of the License. # # Canvas is distributed in the hope that it will be useful, but WITHOUT ANY # WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR # A PARTICULAR PURPOSE. See the GNU Affero General Public License for more # details. # # You should have received a copy of the GNU Affero General Public License along # with this program. If not, see <http://www.gnu.org/licenses/>. # module ShardedBookmarkedCollection # Given an association (+HasManyAssociation+ or +HasManyThroughAssociation+), # automatically creates bookmarked collections for the shard-restricted # versions of that association (using wrap) and then merges those # collections. For parity with the association's +with_each_shard+ methods, # you can also provide additional ActiveRecord find options or a scope # refinement block. # # Example: # # ShardedBookmarkCollection.build(UserBookmarker, @user.courses) # # ShardedBookmarkCollection.build(UserBookmarker, @user.courses) do |scope| # scope.active # end # def self.build(bookmarker, relation, always_use_bookmarks: false) # automatically make associations multi-shard, since that's definitely what you want if you're # using this if (owner = relation.respond_to?(:proxy_association) && relation.proxy_association&.owner) relation = relation.shard(owner) end # not the result of relation.activate because we don't want it to # flatten our list of pairs collections = [] # get the per-shard relations last_relation = nil relation.activate do |sharded_relation| sharded_relation = yield sharded_relation if block_given? # if they returned nil, there was nothing pertinent on this shard anyway, so completely skip it next if sharded_relation.nil? last_relation = sharded_relation collections << [Shard.current.id, BookmarkedCollection.wrap(bookmarker, sharded_relation)] nil end # optimization if there ended up being none return relation.none if collections.empty? # optimization if there only ended up being one return always_use_bookmarks ? collections.last.last : last_relation if collections.size == 1 BookmarkedCollection.merge(*collections) end end