Merge pull request #29604 from kamipo/fix_ids_reader_to_respect_case_sensitive_pk

Fix `ids_reader` to respect case sensitive primary key

activerecord/lib/active_record/associations/collection_association.rb

@@ -44,10 +44,7 @@ def ids_reader
         if loaded?
           target.pluck(reflection.association_primary_key)
         else
-          @association_ids ||= (
-            column = "#{reflection.quoted_table_name}.#{reflection.association_primary_key}"
-            scope.pluck(column)
-          )
+          @association_ids ||= scope.pluck(reflection.association_primary_key)
         end
       end
 

activerecord/test/schema/schema.rb

@@ -107,7 +107,7 @@
     t.boolean :has_fun, null: false, default: false
   end
 
-  create_table :bulbs, force: true do |t|
+  create_table :bulbs, primary_key: "ID", force: true do |t|
     t.integer :car_id
     t.string  :name
     t.boolean :frickinawesome, default: false