How to render an array.to_json with :include option in Rails?

Question

In my controller I have :

def index
  # Array of Task objects
  @tasks = Task.get_tasks(current_user, params)

  respond_to do |format|
    format.html

    # Sends correct JSON but not including the 'author' object in it
    # format.json { render :json => @tasks.to_json(:include => [:author]) }

    # With this the JSON look correct but is interpreted as a string in the JavaScript code
    format.json { render :json => @tasks.map { |e| e = e.to_json(:include => [:author]) } }
  end
end

Do you know any 'clean' solution to properly pass the :include option when rendering an array converted to JSON ?

EDIT

I am using MongoDB

EDIT (2)

I updated from mongoid (2.0.1) to mongoid (2.0.2) and it works. Sorry for the trouble.

Are you sure? I've done some quick test with an array and it seems to work fine... — lucapette
– lucapette, Commented Jul 29, 2011 at 10:36

Ted Kulp · Accepted Answer · 2011-07-29 10:57:42Z

3

The to_json is redundant. I just tested it and with works with some similar code here using the syntax:

format.json { render :json => @tasks, :include => [:author] }

This is rails 3.0.7. This is also assuming that author is set as a belongs_to of Task.

answered Jul 29, 2011 at 10:57

Ted Kulp

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4 Comments

wnkz Over a year ago

Hum ... In fact this works but only for the first object of the array :/ Other objects do not have the author object.

Ted Kulp Over a year ago

Bizarre. My example here has a huge list of items, and each has it's belongs_to embedded as appropriate.

wnkz Over a year ago

Something that might be useful : I am using MongoDB ... :/

Ted Kulp Over a year ago

Oooh, interesting. So you're not using ActiveRecord. That may make the difference, but I'm not sure.

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