Rails-如何将关联的模型数据提取到控制器json调用中？

Question

I have two models that are associated with each other.

Customer has_one :primary_contact

And I would like to pull this data out in a json object so that the primary_contact model is associated with the Customer object.

Right now my controller does this :

@customers = current_account.customers.all

respond_to do |format|
  format.json { render :json => @customers.to_json, :layout => false }
end

But I woud like to also include in these customer objects, their primary contact info as well. How would I go about pulling this information in a associated context so that I get this data in jQuery as :

value.primary_contact.name

Right now, I can pull the json out for the customer object with this :

value.name
value.address

Answer 1

Per the documentation , use the :include option:

To include associations, use :include .

 konata.to_json(:include => :posts) # => {"id": 1, "name": "Konata Izumi", "age": 16, # "created_at": "2006/08/01", "awesome": true, # "posts": [{"id": 1, "author_id": 1, "title": "Welcome to the weblog"}, # {"id": 2, author_id: 1, "title": "So I was thinking"}]} 

Answer 2

To include associations, use :include.

@customers = current_account.customers.all(:include => :primary_contact)

respond_to do |format|
  format.json { render :json => @customers.to_json, :layout => false }
end