From 7412b7f8a6a2634548671c8ca16941796fac87c4 Mon Sep 17 00:00:00 2001 From: Ryuta Kamizono Date: Sun, 19 May 2019 19:13:33 +0900 Subject: Implicit through table joins should be appeared before user supplied joins #36293 was an issue for through association with `joins` for a long time, but since #35864 through association with `left_joins` would also be affected by the issue. Implicit through table joins should be appeared before user supplied joins, otherwise loading through association with joins will cause a statement invalid error. Fixes #36293. ``` % ARCONN=postgresql bundle exec ruby -w -Itest test/cases/associations/has_many_through_associations_test .rb -n test_through_association_with_joins Using postgresql Run options: -n test_through_association_with_joins --seed 7116 # Running: E Error: HasManyThroughAssociationsTest#test_through_association_with_joins: ActiveRecord::StatementInvalid: PG::UndefinedTable: ERROR: missing FROM-clause entry for table "posts" LINE 1: ... "comments_posts" ON "comments_posts"."post_id" = "posts"."i... ^ : SELECT "comments".* FROM "comments" INNER JOIN "comments" "comments_posts" ON "comments_posts"."post_id" = "posts"."id" INNER JOIN "posts" ON "comments"."post_id" = "posts"."id" WHERE "posts"."author_id" = $1 rails test test/cases/associations/has_many_through_associations_test.rb:61 Finished in 0.388657s, 2.5730 runs/s, 0.0000 assertions/s. 1 runs, 0 assertions, 0 failures, 1 errors, 0 skips ``` --- .../lib/active_record/relation/query_methods.rb | 28 +++++++++------------- .../has_many_through_associations_test.rb | 8 +++++++ 2 files changed, 19 insertions(+), 17 deletions(-) diff --git a/activerecord/lib/active_record/relation/query_methods.rb b/activerecord/lib/active_record/relation/query_methods.rb index b8fd2fce14..50ff733dc7 100644 --- a/activerecord/lib/active_record/relation/query_methods.rb +++ b/activerecord/lib/active_record/relation/query_methods.rb @@ -1128,27 +1128,21 @@ module ActiveRecord association_joins = buckets[:association_join] stashed_joins = buckets[:stashed_join] - join_nodes = buckets[:join_node].uniq - string_joins = buckets[:string_join].map(&:strip).uniq + join_nodes = buckets[:join_node].tap(&:uniq!) + string_joins = buckets[:string_join].delete_if(&:blank?).map!(&:strip).tap(&:uniq!) - join_list = join_nodes + convert_join_strings_to_ast(string_joins) - alias_tracker = alias_tracker(join_list, aliases) + string_joins.map! { |join| table.create_string_join(Arel.sql(join)) } - join_dependency = construct_join_dependency(association_joins, join_type) + join_sources = manager.join_sources + join_sources.concat(join_nodes) unless join_nodes.empty? - joins = join_dependency.join_constraints(stashed_joins, alias_tracker) - joins.each { |join| manager.from(join) } - - manager.join_sources.concat(join_list) - - alias_tracker.aliases - end + unless association_joins.empty? && stashed_joins.empty? + alias_tracker = alias_tracker(join_nodes + string_joins, aliases) + join_dependency = construct_join_dependency(association_joins, join_type) + join_sources.concat(join_dependency.join_constraints(stashed_joins, alias_tracker)) + end - def convert_join_strings_to_ast(joins) - joins - .flatten - .reject(&:blank?) - .map { |join| table.create_string_join(Arel.sql(join)) } + join_sources.concat(string_joins) unless string_joins.empty? end def build_select(arel) diff --git a/activerecord/test/cases/associations/has_many_through_associations_test.rb b/activerecord/test/cases/associations/has_many_through_associations_test.rb index 0ab99aa6cd..affa024d77 100644 --- a/activerecord/test/cases/associations/has_many_through_associations_test.rb +++ b/activerecord/test/cases/associations/has_many_through_associations_test.rb @@ -58,6 +58,14 @@ class HasManyThroughAssociationsTest < ActiveRecord::TestCase assert_equal preloaded, Marshal.load(Marshal.dump(preloaded)) end + def test_through_association_with_joins + assert_equal [comments(:eager_other_comment1)], authors(:mary).comments.merge(Post.joins(:comments)) + end + + def test_through_association_with_left_joins + assert_equal [comments(:eager_other_comment1)], authors(:mary).comments.merge(Post.left_joins(:comments)) + end + def test_preload_with_nested_association posts = Post.preload(:author, :author_favorites_with_scope).to_a -- cgit v1.2.3