Revert "Merge pull request #5494 from armstrjare/active_record_relation_keep_association_join_context_on_merge"

This reverts commit dcd04e76179611a9db28c9e391aa7d6c2a5b046a, reversing
changes made to 58a49875df63729f07a9a81d1ee349087d258df5.

2 files changed, 2 insertions, 7 deletions

diff --git a/activerecord/lib/active_record/associations/join_dependency.rb b/activerecord/lib/active_record/associations/join_dependency.rb
index e3d8356f49..cd366ac8b7 100644
--- a/activerecord/lib/active_record/associations/join_dependency.rb
+++ b/activerecord/lib/active_record/associations/join_dependency.rb
@@ -109,7 +109,7 @@ module ActiveRecord
         case associations
         when Symbol, String
           reflection = parent.reflections[associations.to_s.intern] or
-          raise ConfigurationError, "Association named '#{ associations }' was not found on #{parent.active_record.name}; perhaps you misspelled it?"
+          raise ConfigurationError, "Association named '#{ associations }' was not found; perhaps you misspelled it?"
           unless join_association = find_join_association(reflection, parent)
             @reflections << reflection
             join_association = build_join_association(reflection, parent)
diff --git a/activerecord/lib/active_record/associations/join_dependency/join_association.rb b/activerecord/lib/active_record/associations/join_dependency/join_association.rb
index ea4856408d..0d7d28e458 100644
--- a/activerecord/lib/active_record/associations/join_dependency/join_association.rb
+++ b/activerecord/lib/active_record/associations/join_dependency/join_association.rb
@@ -55,12 +55,7 @@ module ActiveRecord
 
         def find_parent_in(other_join_dependency)
           other_join_dependency.join_parts.detect do |join_part|
-            case parent
-            when JoinBase
-              parent.active_record == join_part.active_record
-            else
-              parent == join_part
-            end
+            parent == join_part
           end
         end