Chaining models while rendering JSON in rails

Question

How can I chain multiple models to be rendered as a JSON object in rails. Currently I have a render statement like

render json: current_user.role.selected_bids.to_json(include: [:project => {include: [:milestones , :skill_category] } ] )

I want to append to this JSON object another model where I get to include a model associated to :milestones. Something like this

render json: current_user.role.selected_bids.to_json
(include: [:project => {include: [:milestones=> {include: [:timetrackers]}, 
:skill_category]}])

but its throwing a syntax error. Is it possible to do this level of nesting or should I make another API call ?

You could use serialiser to structure the json or a view based solution such as jbuilder. — Anton
– Anton, Commented Oct 16, 2017 at 7:00
Oh okay, but is it not possible to include an association here itself ? — BigDaddy
– BigDaddy, Commented Oct 16, 2017 at 7:02
apidock.com/rails/ActiveRecord/Serialization/to_json Check out the last block. "2nd level and higher order associations work as well" — Anton
– Anton, Commented Oct 16, 2017 at 7:08

marmeladze · Accepted Answer · 2017-10-16 11:33:44Z

1

The reason you are getting a syntax error is because you are trying to create a Hash using syntax you would use to create an Array. You can instead do this something like this:

render json: current_user.role.selected_bids.to_json(
  include: [
    project: { 
      include: [  
        {
          milestones: {
            include: [:timetrackers]
          }, 
        },
        :skill_category
      ]
    }
  ]
)

edited Oct 16, 2017 at 11:33

marmeladze

6,5863 gold badges28 silver badges49 bronze badges

answered Oct 16, 2017 at 7:13

bitsapien

1,84313 silver badges24 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

bitsapien Over a year ago

Notice how I have wrapped the milestones key inside curly braces to indicate its a Hash.

Collectives™ on Stack Overflow

Chaining models while rendering JSON in rails

1 Answer 1

1 Comment

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

1 Comment

Your Answer

Sign up or log in

Post as a guest

Related