remove now useless const + with_multi_statements

Author: BuonOmo

lib/active_record/connection_adapters/cockroachdb/database_statements.rb

@@ -24,10 +24,8 @@ def insert_fixtures_set(fixture_set, tables_to_delete = [])
           table_deletes = tables_to_delete.map { |table| "DELETE FROM #{quote_table_name(table)}" }
           statements = table_deletes + fixture_inserts
 
-          with_multi_statements do
-            disable_referential_integrity do
-              execute_batch(statements, "Fixtures Load")
-            end
+          disable_referential_integrity do
+            execute_batch(statements, "Fixtures Load")
           end
         end
       end

test/cases/helper_cockroachdb.rb

@@ -17,24 +17,13 @@
 # and COCKROACH_SKIP_LOAD_SCHEMA that can
 # skip this step
 require "support/load_schema_helper"
-class NoPGSchemaTestCase < SimpleDelegator
-  def current_adapter?(...)
-    false
-  end
-end
 
 module LoadSchemaHelperExt
   def load_schema
-    # TODO: Remove this const_set mess once https://github.com/rails/rails/commit/d5c2ff8345c9d23b7326edb2bbe72b6e86a63140
-    #   is part of a rails release.
-    old_helper = ActiveRecord::TestCase
-    ActiveRecord.const_set(:TestCase, NoPGSchemaTestCase.new(ActiveRecord::TestCase))
     return if ENV['COCKROACH_LOAD_FROM_TEMPLATE']
     return if ENV['COCKROACH_SKIP_LOAD_SCHEMA']
 
     super
-  ensure
-    ActiveRecord.const_set(:TestCase, old_helper)
   end
 end
 LoadSchemaHelper.prepend(LoadSchemaHelperExt)