Question

I’m trying to convert an ActiveRecord model to JSON in Rails, and while the to_json method generally works, the model’s virtual attributes are not included. Is there a way within Rails to list not just the attributes of a model, but also it’s attr_accessor and attr_reader attributes in order that all readable attributes are available when the model is converted to JSON?

Answer 1

Before Rails 3, use the :method option:

@model.to_json(:method => %w(some_virtual_attribute another_virtual_attribute))

In Rails 3, use :methods option

@model.to_json(:methods => %w(some_virtual_attribute another_virtual_attribute))