From d0be40cad168aae558eeb6a9b12acd8d113e3fc9 Mon Sep 17 00:00:00 2001 From: Ryuta Kamizono Date: Wed, 11 Nov 2015 23:05:44 +0900 Subject: Add `columns_for_distinct` for MySQL 5.7 with ONLY_FULL_GROUP_BY In MySQL 5.7.5 and up, ONLY_FULL_GROUP_BY affects handling of queries that use DISTINCT and ORDER BY. It requires the ORDER BY columns in the select list for distinct queries, and requires that the ORDER BY include the distinct column. See https://dev.mysql.com/doc/refman/5.7/en/group-by-handling.html --- .../cases/adapters/mysql2/mysql2_adapter_test.rb | 44 ++++++++++++++++++++++ 1 file changed, 44 insertions(+) create mode 100644 activerecord/test/cases/adapters/mysql2/mysql2_adapter_test.rb (limited to 'activerecord/test/cases/adapters/mysql2/mysql2_adapter_test.rb') diff --git a/activerecord/test/cases/adapters/mysql2/mysql2_adapter_test.rb b/activerecord/test/cases/adapters/mysql2/mysql2_adapter_test.rb new file mode 100644 index 0000000000..4efd728754 --- /dev/null +++ b/activerecord/test/cases/adapters/mysql2/mysql2_adapter_test.rb @@ -0,0 +1,44 @@ +require "cases/helper" + +class Mysql2AdapterTest < ActiveRecord::Mysql2TestCase + def setup + @conn = ActiveRecord::Base.connection + end + + def test_columns_for_distinct_zero_orders + assert_equal "posts.id", + @conn.columns_for_distinct("posts.id", []) + end + + def test_columns_for_distinct_one_order + assert_equal "posts.id, posts.created_at AS alias_0", + @conn.columns_for_distinct("posts.id", ["posts.created_at desc"]) + end + + def test_columns_for_distinct_few_orders + assert_equal "posts.id, posts.created_at AS alias_0, posts.position AS alias_1", + @conn.columns_for_distinct("posts.id", ["posts.created_at desc", "posts.position asc"]) + end + + def test_columns_for_distinct_with_case + assert_equal( + 'posts.id, CASE WHEN author.is_active THEN UPPER(author.name) ELSE UPPER(author.email) END AS alias_0', + @conn.columns_for_distinct('posts.id', + ["CASE WHEN author.is_active THEN UPPER(author.name) ELSE UPPER(author.email) END"]) + ) + end + + def test_columns_for_distinct_blank_not_nil_orders + assert_equal "posts.id, posts.created_at AS alias_0", + @conn.columns_for_distinct("posts.id", ["posts.created_at desc", "", " "]) + end + + def test_columns_for_distinct_with_arel_order + order = Object.new + def order.to_sql + "posts.created_at desc" + end + assert_equal "posts.id, posts.created_at AS alias_0", + @conn.columns_for_distinct("posts.id", [order]) + end +end -- cgit v1.2.3