How to modify a json response to include own keys instead it being created by itself in rails?

Question

I have two models category and sub_category

class Category < ActiveRecord::Base
    has_many :sub_categories

and

class SubCategory < ActiveRecord::Base
    belongs_to :category

now in my sub_category controller i have

@sub_category = SubCategory.paginate(:page => params[:page], :per_page => params[:per_page]).all(:order => 'id ASC')
respond_to do |format|
          format.json { render json: {:sub_category => @sub_category.as_json(:only => [:id, :name, :category_id, :created_at, :updated_at])} }
      end

but i want the category object to which the subcategory belongs_to within this as shown below

    [
    {
    "sub_category":
    [{
    "created_at":"2013-09-25T07:16:53Z",
    "id":2,
    "name":"mobile",
    "updated_at":"2013-09-25T07:19:39Z"
    "category":{"id":1, "name":"gadgets"}
    }]
    }
    ]

How can i do it? Please help me.

Marek Lipka · Accepted Answer · 2013-09-27 07:16:39Z

1

This should work:

@sub_category = Subcategory.paginate(:page => params[:page], :per_page => params[:per_page]).order('id ASC').includes(:category)
respond_to do |format|
  format.json { render json: {:sub_category => @sub_category.as_json(
    :only => [:id, :name, :category_id, :created_at, :updated_at],
    :include => {:category => {:only => [:id, :name])} }
end

edited Sep 27, 2013 at 7:16

answered Sep 27, 2013 at 7:05

Marek Lipka

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4 Comments

logesh Over a year ago

Thankyou, I have been trying this but what i did is :include => [:categories] instead of :include => [:category]. So thankyou anyway.

logesh Over a year ago

one more doubt. In category i can use :include => [:sub_categories] but can i able to limit the number of sub_categories to be included. May be we can define it in model but i wanted to limit in only this response. Is this is possible?

Marek Lipka Over a year ago

@Logesh basically, you can't because of how eager loading works.

logesh Over a year ago

ok. Is there some other way to restrict or can i be able to do like this Category.includes(:sub_categories).first or anything similar. Actually I wanted to fetch the categories along with the first sub_category.

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