require 'cases/helper' require 'models/post' class EachTest < ActiveRecord::TestCase fixtures :posts def setup @posts = Post.order("id asc") @total = Post.count Post.count('id') # preheat arel's table cache end def test_each_should_excecute_one_query_per_batch assert_queries(Post.count + 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_execcute_only_one_query assert_queries(1) do result = Post.find_each(:batch_size => 100000){ } assert_nil result 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| post } 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_find_in_batches_should_return_batches assert_queries(Post.count + 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(Post.count) 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_excute_query_unless_needed post_count = Post.count assert_queries(2) do Post.find_in_batches(:batch_size => post_count) {|batch| assert_kind_of Array, batch } end assert_queries(1) do Post.find_in_batches(:batch_size => post_count + 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.to_a.map(&:id).sort posts = [] SpecialPostWithDefaultScope.find_in_batches do |batch| posts.concat(batch) end assert_equal special_posts_ids, posts.map(&:id) end end