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 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(RuntimeError) 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 ActiveRecord::Base.logger.expects(:warn) Post.limit(1).find_each { |post| post } end def test_warn_if_order_scope_is_set ActiveRecord::Base.logger.expects(:warn) Post.order("title").find_each { |post| post } 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_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" not_a_post.stubs(:id).raises(StandardError, "not_a_post had #id called on it") 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 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), posts.first 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_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_each(:batch_size => 1) do |subscriber| assert_kind_of Subscriber, subscriber end end end def test_find_in_batches_should_return_an_enumerator enum = nil assert_queries(0) 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 end