```ruby
# frozen_string_literal: true

require "rails"
require "action_controller/railtie"
require "active_record/railtie"
require "active_storage/engine"

require "action_text"

module ActionText
  class Engine < Rails::Engine
    isolate_namespace ActionText
    config.eager_load_namespaces << ActionText

    initializer "action_text.attribute" do
      ActiveSupport.on_load(:active_record) do
        include ActionText::Attribute
      end
    end

    initializer "action_text.attachable" do
      ActiveSupport.on_load(:active_storage_blob) do
        include ActionText::Attachable

        def previewable_attachable?
          representable?
        end
      end
    end

    initializer "action_text.helper" do
      ActiveSupport.on_load(:action_controller_base) do
        helper ActionText::Engine.helpers
      end
    end

    initializer "action_text.renderer" do
      ActiveSupport.on_load(:action_text_content) do
        self.renderer ||= ApplicationController.renderer
      end

      ActiveSupport.on_load(:action_controller_base) do
        before_action { ActionText::Content.renderer = ActionText::Content.renderer.new(request.env) }
      end
    end
  end
end
```

Reset ActionText::Content.renderer before and after each request
user
```ruby
# frozen_string_literal: true

require "rails"
require "action_controller/railtie"
require "active_record/railtie"
require "active_storage/engine"

require "action_text"

module ActionText
  class Engine < Rails::Engine
    isolate_namespace ActionText
    config.eager_load_namespaces << ActionText

    initializer "action_text.attribute" do
      ActiveSupport.on_load(:active_record) do
        include ActionText::Attribute
      end
    end

    initializer "action_text.attachable" do
      ActiveSupport.on_load(:active_storage_blob) do
        include ActionText::Attachable

        def previewable_attachable?
          representable?
        end
      end
    end

    initializer "action_text.helper" do
      ActiveSupport.on_load(:action_controller_base) do
        helper ActionText::Engine.helpers
      end
    end

    initializer "action_text.renderer" do |app|
      app.executor.to_run      { ActionText::Content.renderer = ApplicationController.renderer }
      app.executor.to_complete { ActionText::Content.renderer = ApplicationController.renderer }

      ActiveSupport.on_load(:action_text_content) do
        self.renderer = ApplicationController.renderer
      end

      ActiveSupport.on_load(:action_controller_base) do
        before_action { ActionText::Content.renderer = ApplicationController.renderer.new(request.env) }
      end
    end
  end
end
```
assistant