Add a test case for unscoping default_scope in associations
#29611
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Unscoping `default_scope` in associations has already supported (rails#17360 for preloading, c9cf8b8 for eager loading). Fixes rails#20679. Closes rails#16531.
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rails#29589 changed merging scope order to allow to unscope default scopes on association scope (rails#29611), but that caused a regression rails#38811 that accidentally allow join constraint which is required. ``` % bin/test test/cases/associations/has_many_associations_test.rb -n test_unscopes_the_default_scope_of_associated_model_when_used_with_include Run options: -n test_unscopes_the_default_scope_of_associated_model_when_used_with_include --seed 32978 # Running: E Error: HasManyAssociationsTest#test_unscopes_the_default_scope_of_associated_model_when_used_with_include: NoMethodError: undefined method `children' for nil:NilClass ~/rails/activerecord/lib/active_record/associations/join_dependency/join_association.rb:39:in `block in join_constraints' ~/rails/activerecord/lib/active_record/associations/join_dependency/join_association.rb:30:in `reverse_each' ~/rails/activerecord/lib/active_record/associations/join_dependency/join_association.rb:30:in `with_index' ~/rails/activerecord/lib/active_record/associations/join_dependency/join_association.rb:30:in `join_constraints' ~/rails/activerecord/lib/active_record/associations/join_dependency.rb:171:in `make_constraints' ~/rails/activerecord/lib/active_record/associations/join_dependency.rb:196:in `block in walk' ~/rails/activerecord/lib/active_record/associations/join_dependency.rb:196:in `each' ~/rails/activerecord/lib/active_record/associations/join_dependency.rb:196:in `flat_map' ~/rails/activerecord/lib/active_record/associations/join_dependency.rb:196:in `walk' ~/rails/activerecord/lib/active_record/associations/join_dependency.rb:90:in `block in join_constraints' ~/rails/activerecord/lib/active_record/associations/join_dependency.rb:87:in `each' ~/rails/activerecord/lib/active_record/associations/join_dependency.rb:87:in `flat_map' ~/rails/activerecord/lib/active_record/associations/join_dependency.rb:87:in `join_constraints' ~/rails/activerecord/lib/active_record/relation/query_methods.rb:1226:in `build_join_query' ~/rails/activerecord/lib/active_record/relation/query_methods.rb:1211:in `build_joins' ~/rails/activerecord/lib/active_record/relation/query_methods.rb:1091:in `build_arel' ~/rails/activerecord/lib/active_record/relation/query_methods.rb:1063:in `arel' ~/rails/activerecord/lib/active_record/relation/finder_methods.rb:419:in `block in limited_ids_for' ~/rails/activerecord/lib/active_record/relation.rb:867:in `skip_query_cache_if_necessary' ~/rails/activerecord/lib/active_record/relation/finder_methods.rb:419:in `limited_ids_for' ~/rails/activerecord/lib/active_record/relation/finder_methods.rb:398:in `apply_join_dependency' ~/rails/activerecord/lib/active_record/relation.rb:839:in `block in exec_queries' ~/rails/activerecord/lib/active_record/relation.rb:867:in `skip_query_cache_if_necessary' ~/rails/activerecord/lib/active_record/relation.rb:834:in `exec_queries' ~/rails/activerecord/lib/active_record/relation.rb:639:in `load' ~/rails/activerecord/lib/active_record/relation.rb:250:in `records' ~/rails/activerecord/lib/active_record/relation/finder_methods.rb:508:in `find_take' ~/rails/activerecord/lib/active_record/relation/finder_methods.rb:98:in `take' ~/rails/activerecord/lib/active_record/relation/finder_methods.rb:458:in `find_one' ~/rails/activerecord/lib/active_record/relation/finder_methods.rb:442:in `find_with_ids' ~/rails/activerecord/lib/active_record/relation/finder_methods.rb:69:in `find' ~/rails/activerecord/test/cases/associations/has_many_associations_test.rb:2689:in `block in <class:HasManyAssociationsTest>' bin/test test/cases/associations/has_many_associations_test.rb:2683 ``` Required join constraint should not be allowed to unscoping. Fixes rails#38811.
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Unscoping
default_scopein associations has already supported (#17360for preloading, c9cf8b8 for eager loading).
Fixes #20679.
Closes #16531.