Activerecord associations as JSON with Grape

问题

Is there a simple way to return activerecord models with associations as JSON using the Grape microframework?

get 'users' do
  User.includes(:address)
end

This snippet isn't working and User.includes(:address).to_json(include: :address) will get encoded twice as JSON. (To use the to_json method on my own doesn't feel right anyway)

回答1:

You might want to use #as_json instead.

So you can do

User.includes(:address).as_json(include: :address)

and that gives you a hash instead of a json string.

回答2:

This sounds like a good application for the grape-active_model_serializers plugin.

It will manage serializing the objects into JSON for you, including embedding associations by default, and it's extremely configurable if you want/need to override its defaults.

来源：https://stackoverflow.com/questions/19137521/activerecord-associations-as-json-with-grape