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scope_union.rb
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# frozen_string_literal: true # # Copyright (C) 2018 - 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/>. # # Abstraction on scopes which cannot be joined into one scope (for instance, # they involve different shards) that implements many methods a scope would # implement. # NOTE: if scopes have an "ORDER BY" that would likely have to reimplemented # with a ruby sort. (See ContextToolFinder#all_tools_sorted_array) module Lti class ScopeUnion attr_reader :scopes def initialize(scopes) @scopes = scopes end def exists? scopes.any?(&:exists?) end def to_unsorted_array scopes.flat_map(&:to_a) end # Looks at each shard in order. (In ContextToolFinder, the first shard is # the one the context is on, rather than a federated parent shard) def take scopes.each do |scope| taken = scope.take return taken if taken end nil end def pluck(*args) scopes.inject([]) { |agg, scope| agg.concat(scope.pluck(*args)) } end def each(&) scopes.each do |scope| scope.each(&) end end end end