require 'cases/helper' require 'models/post' require 'models/subscriber' class EachTest < ActiveRecord::TestCase fixtures :posts, :subscribers def setup @posts = Post.order("id asc") @total = Post.count Post.count('id') # preheat arel's table cache end def test_each_should_execute_one_query_per_batch assert_queries(@total + 1) do Post.find_each(:batch_size => 1) do |post| assert_kind_of Post, post end end end def test_each_should_not_return_query_chain_and_execute_only_one_query assert_queries(1) do result = Post.find_each(:batch_size => 100000){ } assert_nil result end end def test_each_should_return_an_enumerator_if_no_block_is_present assert_queries(1) do Post.find_each(:batch_size => 100000).with_index do |post, index| assert_kind_of Post, post assert_kind_of Integer, index end end end if Enumerator.method_defined? :size def test_each_should_return_a_sized_enumerator assert_equal 11, Post.find_each(batch_size: 1).size assert_equal 5, Post.find_each(batch_size: 2, start: 7).size assert_equal 11, Post.find_each(batch_size: 10_000).size end end def test_each_enumerator_should_execute_one_query_per_batch assert_queries(@total + 1) do Post.find_each(:batch_size => 1).with_index do |post, index| assert_kind_of Post, post assert_kind_of Integer, index end end end def test_each_should_raise_if_select_is_set_without_id assert_raise(ArgumentError) do Post.select(:title).find_each(batch_size: 1) { |post| flunk "should not call this block" } end end def test_each_should_execute_if_id_is_in_select assert_queries(6) do Post.select("id, title, type").find_each(:batch_size => 2) do |post| assert_kind_of Post, post end end end def test_warn_if_limit_scope_is_set assert_called(ActiveRecord::Base.logger, :warn) do Post.limit(1).find_each { |post| post } end end def test_warn_if_order_scope_is_set assert_called(ActiveRecord::Base.logger, :warn) do Post.order("title").find_each { |post| post } end end def test_logger_not_required previous_logger = ActiveRecord::Base.logger ActiveRecord::Base.logger = nil assert_nothing_raised do Post.limit(1).find_each { |post| post } end ensure ActiveRecord::Base.logger = previous_logger end def test_find_in_batches_should_return_batches assert_queries(@total + 1) do Post.find_in_batches(:batch_size => 1) do |batch| assert_kind_of Array, batch assert_kind_of Post, batch.first end end end def test_find_in_batches_should_start_from_the_start_option assert_queries(@total) do Post.find_in_batches(batch_size: 1, start: 2) do |batch| assert_kind_of Array, batch assert_kind_of Post, batch.first end end end def test_find_in_batches_should_finish_the_end_option assert_queries(6) do Post.find_in_batches(batch_size: 1, finish: 5) do |batch| assert_kind_of Array, batch assert_kind_of Post, batch.first end end end def test_find_in_batches_shouldnt_execute_query_unless_needed assert_queries(2) do Post.find_in_batches(:batch_size => @total) {|batch| assert_kind_of Array, batch } end assert_queries(1) do Post.find_in_batches(:batch_size => @total + 1) {|batch| assert_kind_of Array, batch } end end def test_find_in_batches_should_quote_batch_order c = Post.connection assert_sql(/ORDER BY #{c.quote_table_name('posts')}.#{c.quote_column_name('id')}/) do Post.find_in_batches(:batch_size => 1) do |batch| assert_kind_of Array, batch assert_kind_of Post, batch.first end end end def test_find_in_batches_should_not_use_records_after_yielding_them_in_case_original_array_is_modified not_a_post = "not a post" def not_a_post.id; end not_a_post.stub(:id, ->{ raise StandardError.new("not_a_post had #id called on it") }) do assert_nothing_raised do Post.find_in_batches(:batch_size => 1) do |batch| assert_kind_of Array, batch assert_kind_of Post, batch.first batch.map! { not_a_post } end end end end def test_find_in_batches_should_ignore_the_order_default_scope # First post is with title scope first_post = PostWithDefaultScope.first posts = [] PostWithDefaultScope.find_in_batches do |batch| posts.concat(batch) end # posts.first will be ordered using id only. Title order scope should not apply here assert_not_equal first_post, posts.first assert_equal posts(:welcome).id, posts.first.id end def test_find_in_batches_should_not_ignore_the_default_scope_if_it_is_other_then_order special_posts_ids = SpecialPostWithDefaultScope.all.map(&:id).sort posts = [] SpecialPostWithDefaultScope.find_in_batches do |batch| posts.concat(batch) end assert_equal special_posts_ids, posts.map(&:id) end def test_find_in_batches_should_not_modify_passed_options assert_nothing_raised do Post.find_in_batches({ batch_size: 42, start: 1 }.freeze){} end end def test_find_in_batches_should_use_any_column_as_primary_key nick_order_subscribers = Subscriber.order('nick asc') start_nick = nick_order_subscribers.second.nick subscribers = [] Subscriber.find_in_batches(batch_size: 1, start: start_nick) do |batch| subscribers.concat(batch) end assert_equal nick_order_subscribers[1..-1].map(&:id), subscribers.map(&:id) end def test_find_in_batches_should_use_any_column_as_primary_key_when_start_is_not_specified assert_queries(Subscriber.count + 1) do Subscriber.find_in_batches(batch_size: 1) do |batch| assert_kind_of Array, batch assert_kind_of Subscriber, batch.first end end end def test_find_in_batches_should_return_an_enumerator enum = nil assert_no_queries do enum = Post.find_in_batches(:batch_size => 1) end assert_queries(4) do enum.first(4) do |batch| assert_kind_of Array, batch assert_kind_of Post, batch.first end end end def test_in_batches_should_not_execute_any_query assert_no_queries do assert_kind_of ActiveRecord::Batches::BatchEnumerator, Post.in_batches(of: 2) end end def test_in_batches_should_yield_relation_if_block_given assert_queries(6) do Post.in_batches(of: 2) do |relation| assert_kind_of ActiveRecord::Relation, relation end end end def test_in_batches_should_be_enumerable_if_no_block_given assert_queries(6) do Post.in_batches(of: 2).each do |relation| assert_kind_of ActiveRecord::Relation, relation end end end def test_in_batches_each_record_should_yield_record_if_block_is_given assert_queries(6) do Post.in_batches(of: 2).each_record do |post| assert post.title.present? assert_kind_of Post, post end end end def test_in_batches_each_record_should_return_enumerator_if_no_block_given assert_queries(6) do Post.in_batches(of: 2).each_record.with_index do |post, i| assert post.title.present? assert_kind_of Post, post end end end def test_in_batches_each_record_should_be_ordered_by_id ids = Post.order('id ASC').pluck(:id) assert_queries(6) do Post.in_batches(of: 2).each_record.with_index do |post, i| assert_equal ids[i], post.id end end end def test_in_batches_update_all_affect_all_records assert_queries(6 + 6) do # 6 selects, 6 updates Post.in_batches(of: 2).update_all(title: "updated-title") end assert_equal Post.all.pluck(:title), ["updated-title"] * Post.count end def test_in_batches_delete_all_should_not_delete_records_in_other_batches not_deleted_count = Post.where('id <= 2').count Post.where('id > 2').in_batches(of: 2).delete_all assert_equal 0, Post.where('id > 2').count assert_equal not_deleted_count, Post.count end def test_in_batches_should_not_be_loaded Post.in_batches(of: 1) do |relation| assert_not relation.loaded? end Post.in_batches(of: 1, load: false) do |relation| assert_not relation.loaded? end end def test_in_batches_should_be_loaded Post.in_batches(of: 1, load: true) do |relation| assert relation.loaded? end end def test_in_batches_if_not_loaded_executes_more_queries assert_queries(@total + 1) do Post.in_batches(of: 1, load: false) do |relation| assert_not relation.loaded? end end end def test_in_batches_should_return_relations assert_queries(@total + 1) do Post.in_batches(of: 1) do |relation| assert_kind_of ActiveRecord::Relation, relation end end end def test_in_batches_should_start_from_the_start_option post = Post.order('id ASC').where('id >= ?', 2).first assert_queries(2) do relation = Post.in_batches(of: 1, start: 2).first assert_equal post, relation.first end end def test_in_batches_should_finish_the_end_option post = Post.order('id DESC').where('id <= ?', 5).first assert_queries(7) do relation = Post.in_batches(of: 1, finish: 5, load: true).reverse_each.first assert_equal post, relation.last end end def test_in_batches_shouldnt_execute_query_unless_needed assert_queries(2) do Post.in_batches(of: @total) { |relation| assert_kind_of ActiveRecord::Relation, relation } end assert_queries(1) do Post.in_batches(of: @total + 1) { |relation| assert_kind_of ActiveRecord::Relation, relation } end end def test_in_batches_should_quote_batch_order c = Post.connection assert_sql(/ORDER BY #{c.quote_table_name('posts')}.#{c.quote_column_name('id')}/) do Post.in_batches(of: 1) do |relation| assert_kind_of ActiveRecord::Relation, relation assert_kind_of Post, relation.first end end end def test_in_batches_should_not_use_records_after_yielding_them_in_case_original_array_is_modified not_a_post = "not a post" def not_a_post.id raise StandardError.new("not_a_post had #id called on it") end assert_nothing_raised do Post.in_batches(of: 1) do |relation| assert_kind_of ActiveRecord::Relation, relation assert_kind_of Post, relation.first relation = [not_a_post] * relation.count end end end def test_in_batches_should_not_ignore_default_scope_without_order_statements special_posts_ids = SpecialPostWithDefaultScope.all.map(&:id).sort posts = [] SpecialPostWithDefaultScope.in_batches do |relation| posts.concat(relation) end assert_equal special_posts_ids, posts.map(&:id) end def test_in_batches_should_not_modify_passed_options assert_nothing_raised do Post.in_batches({ of: 42, start: 1 }.freeze){} end end def test_in_batches_should_use_any_column_as_primary_key nick_order_subscribers = Subscriber.order('nick asc') start_nick = nick_order_subscribers.second.nick subscribers = [] Subscriber.in_batches(of: 1, start: start_nick) do |relation| subscribers.concat(relation) end assert_equal nick_order_subscribers[1..-1].map(&:id), subscribers.map(&:id) end def test_in_batches_should_use_any_column_as_primary_key_when_start_is_not_specified assert_queries(Subscriber.count + 1) do Subscriber.in_batches(of: 1, load: true) do |relation| assert_kind_of ActiveRecord::Relation, relation assert_kind_of Subscriber, relation.first end end end def test_in_batches_should_return_an_enumerator enum = nil assert_no_queries do enum = Post.in_batches(of: 1) end assert_queries(4) do enum.first(4) do |relation| assert_kind_of ActiveRecord::Relation, relation assert_kind_of Post, relation.first end end end def test_in_batches_relations_should_not_overlap_with_each_other seen_posts = [] Post.in_batches(of: 2, load: true) do |relation| relation.to_a.each do |post| assert_not seen_posts.include?(post) seen_posts << post end end end def test_in_batches_relations_with_condition_should_not_overlap_with_each_other seen_posts = [] author_id = Post.first.author_id posts_by_author = Post.where(author_id: author_id) Post.in_batches(of: 2) do |batch| seen_posts += batch.where(author_id: author_id) end assert_equal posts_by_author.pluck(:id).sort, seen_posts.map(&:id).sort end def test_in_batches_relations_update_all_should_not_affect_matching_records_in_other_batches Post.update_all(author_id: 0) person = Post.last person.update_attributes(author_id: 1) Post.in_batches(of: 2) do |batch| batch.where('author_id >= 1').update_all('author_id = author_id + 1') end assert_equal 2, person.reload.author_id # incremented only once end if Enumerator.method_defined? :size def test_find_in_batches_should_return_a_sized_enumerator assert_equal 11, Post.find_in_batches(:batch_size => 1).size assert_equal 6, Post.find_in_batches(:batch_size => 2).size assert_equal 4, Post.find_in_batches(batch_size: 2, start: 4).size assert_equal 4, Post.find_in_batches(:batch_size => 3).size assert_equal 1, Post.find_in_batches(:batch_size => 10_000).size end end end