Merge pull request #29609 from tsukasaoishi/query_cache_from_beginning

Enable query cache if set a configurations

activerecord/CHANGELOG.md

+*   Query cache was unavailable when entering the `ActiveRecord::Base.cache` block
+    without being connected.
+
+    *Tsukasa Oishi*
+
 *   Fix `bin/rails db:setup` and `bin/rails db:test:prepare` create  wrong
     ar_internal_metadata's data for a test database.
 

activerecord/lib/active_record/query_cache.rb

@@ -5,20 +5,20 @@ module ClassMethods
       # Enable the query cache within the block if Active Record is configured.
       # If it's not, it will execute the given block.
       def cache(&block)
-        if connected?
-          connection.cache(&block)
-        else
+        if configurations.empty?
           yield
+        else
+          connection.cache(&block)
         end
       end
 
       # Disable the query cache within the block if Active Record is configured.
       # If it's not, it will execute the given block.
       def uncached(&block)
-        if connected?
-          connection.uncached(&block)
-        else
+        if configurations.empty?
           yield
+        else
+          connection.uncached(&block)
         end
       end
     end

activerecord/test/cases/query_cache_test.rb

@@ -320,18 +320,7 @@ def test_cache_is_ignored_for_locked_relations
     end
   end
 
-  def test_cache_is_available_when_connection_is_connected
-    conf = ActiveRecord::Base.configurations
-
-    ActiveRecord::Base.configurations = {}
-    Task.cache do
-      assert_queries(1) { Task.find(1); Task.find(1) }
-    end
-  ensure
-    ActiveRecord::Base.configurations = conf
-  end
-
-  def test_cache_is_not_available_when_using_a_not_connected_connection
+  def test_cache_is_available_when_using_a_not_connected_connection
     with_temporary_connection_pool do
       spec_name = Task.connection_specification_name
       conf = ActiveRecord::Base.configurations["arunit"].merge("name" => "test2")
@@ -348,8 +337,7 @@ def test_cache_is_not_available_when_using_a_not_connected_connection
             end
             ActiveRecord::FixtureSet.create_fixtures(self.class.fixture_path, ["tasks"], {}, ActiveRecord::Base)
           end
-          Task.connection # warmup postgresql connection setup queries
-          assert_queries(2) { Task.find(1); Task.find(1) }
+          assert_queries(1) { Task.find(1); Task.find(1) }
         ensure
           ActiveRecord::Base.connection_handler.remove_connection(Task.connection_specification_name)
           Task.connection_specification_name = spec_name