Remove action_controller.perform_caching from api app's configs

As suggested in https://github.com/rails/rails/issues/35602#issuecomment-485833483, because we don't provide view caching and doesn't include `ActionController::Caching` for api apps, we should also avoid generating

```ruby
config.action_controller.perform_caching = true
```

for those api apps. So it won't confuse people.

**But because `perform_caching` will be `true` if not set, the behavior of the app would still be the same without these configs.**

1 files changed, 7 insertions, 0 deletions

diff --git a/railties/test/generators/api_app_generator_test.rb b/railties/test/generators/api_app_generator_test.rb
index 503564beec..d03178da66 100644
--- a/railties/test/generators/api_app_generator_test.rb
+++ b/railties/test/generators/api_app_generator_test.rb
@@ -50,6 +50,13 @@ class ApiAppGeneratorTest < Rails::Generators::TestCase
 
     assert_file "config/application.rb", /config\.api_only = true/
     assert_file "app/controllers/application_controller.rb", /ActionController::API/
+
+    assert_file "config/environments/development.rb" do |content|
+      assert_no_match(/action_controller\.perform_caching = true/, content)
+    end
+    assert_file "config/environments/production.rb" do |content|
+      assert_no_match(/action_controller\.perform_caching = true/, content)
+    end
   end
 
   def test_generator_if_skip_action_cable_is_given