Auto-rendering ActionText body contents instead of their attributes hash

[goulvench]

In ERB templates, ActionText attributes are automatically cast to strings, thus rendering their HTML contents. However, in jbuilder this is not the case and we have to call to_s on every action_text attribute, which is verbose and easy to forget.

What's worse is that it prevents passing an object and attributes list to json.extract! or an enumarable and a list of attributes to json.array!.

Is there a way to specify a formatter that would work on action_text fields only? Or perhaps adding an opt-in mechanism in Jbuilder::_extract_method_values to handle this situation?

I know this would mean tying adding ActionText-specific code to Jbuilder but given that these two libraries are generally used together in Rails, this could make sense. I'd be happy to take a stab at a PR if you think this is a good idea.

Example with json.extract!

# Doesn't work as expected:
json.extract! my_model, :id, :updated_at, :some_rich_text
{
  "id": 1,
  "updated_at":"2022-05-23T10:08:38.784+02:00",
  "some_rich_text":
  {
    "id":1,
    "name":"some_rich_text",
    "body":"<div>Rich text contents</div>",
    "record_type":"MyModel",
    "record_id":20,
    "created_at":"2022-05-23T10:08:38.784+02:00",
    "updated_at":"2022-05-23T10:08:38.784+02:00"
  }
}

# Works:
json.extract! my_model, :id, :updated_at
json.some_rich_text my_model.some_rich_text.to_s 
{
  "id": 1,
  "updated_at":"2022-05-23T10:08:38.784+02:00",
  "some_rich_text":"<div>Rich text contents</div>"
}

Example with json.array!

# Doesn't work as expected:
json.array! my_collection, :id, :updated_at, :some_rich_text
[
  {
    "id": 1,
    "updated_at":"2022-05-23T10:08:38.784+02:00",
    "some_rich_text":
    {
      "id":1,
      "name":"some_rich_text",
      "body":"<div>Rich text contents</div>",
      "record_type":"MyModel",
      "record_id":20,
      "created_at":"2022-05-23T10:08:38.784+02:00",
      "updated_at":"2022-05-23T10:08:38.784+02:00"
    }
  }
]

# Works:
json.array! my_collection do |item|
  json.extract! item, :id, :updated_at
  json.some_rich_text item.some_rich_text.to_s
end
[
  {
    "id": 1,
    "updated_at":"2022-05-23T10:08:38.784+02:00",
    "some_rich_text":"<div>Rich text contents</div>"
  }
]