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Removes caching from ActiveRecord::Core::ClassMethods#relation
The #relation method gets called in four places and the return value was instantly cloned in three of them. The only place that did not clone was ActiveRecord::Scoping::Default::ClassMethods#unscoped. This introduced a bug described in #5667 and should really clone the relation, too. This means all four places would clone the relation, so it doesn't make a lot of sense caching it in the first place. The four places with calls to relations are: activerecord/lib/active_record/scoping/default.rb:110:in `block in build_default_scope'" activerecord/lib/active_record/scoping/default.rb:42:in `unscoped'" activerecord/lib/active_record/scoping/named.rb:38:in `scoped'" activerecord/lib/active_record/scoping/named.rb:52:in `scope_attributes'" Conflicts: activerecord/lib/active_record/core.rb
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