Ruby on Rails 4使用条件渲染：json

Question

I have this render expression in a Ruby on Rails 4 controller:

render :json => @account_preferences, :include => {:payment_methods => {:include => {:payment_type => {:only => [:id, :name]}}}}

Can I filter the payment_methods somehow in this expression to get only the payment_methods with state = 'Confirmed'?

Answer 1

If you do a lot of includes and conditionals I'd recommend using jbuilder to do this kind of stuff. Did you take a look at that? https://github.com/rails/jbuilder

It's included in your Gemfile by default in a rails 4 project.

Answer 2

I don't believe you can do this conditionally in the render :json. But something like this would work:

class AccountPreference < ActiveRecord::Base
  has_many :confirmed_payment_methods,-> { where state: 'Confirmed' }, class_name: 'PaymentMethod'
end

and call that association in your to_json

render :json => @account_preferences, :include => {:confirmed_payment_methods => {:include => {:payment_type => {:only => [:id, :name]}}}}