Say i have this short code:
item = Item.find(params[:id])
render :json => item.to_json
but i needed to insert/push extra information to the returned json object, how do i do that?
Lets say i need to insert this extra info:
message : "it works"
Thanks.
item = Item.find(params[:id])
item["message"] = "it works"
render :json => item.to_json
can't write unknown attribute. But below solving is works for me.
item = item.as_json need add to second line? haven't test yetThe to_json method takes an option object as parameter . So what you can do is make a method in your item class called as message and have it return the text that you want as its value .
class Item < ActiveRecord::Base
def message
"it works"
end
end
render :json => item.to_json(:methods => :message)
I found the accepted answer now throws deprecation warnings in Rails 3.2.13.
DEPRECATION WARNING: You're trying to create an attribute
message'. Writing arbitrary attributes on a model is deprecated. Please just useattr_writer` etc.
Assuming you don't want to put the suggested attr_writer in your model, you can use the as_json method (returns a Hash) to tweak your JSON response object.
item = Item.find(params[:id])
render :json => item.as_json.merge(:message => 'it works')
as_json returns an array and there's no method called merge for array. there's a way to convert the item object into hash and then simply add the :message. such as render json: Hash[[*item.map.with_index]].invert[:message] = 'it works' converting into hash linkrender json: {items: item, message: 'it works'}
If you use scaffold, e.g.:
rails generate scaffold MyItem
in the view folder you will see next files:
app/view/my_item/_my_item.json.jbuilder
app/view/my_item/index.json.jbuilder
so, you can add custom data to json output for an item, just add this:
json.extract! my_item, :id, :some_filed, :created_at, :updated_at
json.url my_item_url(my_item, format: :json)
json.my_data my_function(my_item)
As you can see, it's possible to modify as one item json output, as index json output.
I always use:
@item = Item.find(params[:id])
render json: { item: @item.map { |p| { id: p.id, name: p.name } }, message: "it works" }
Have you tried this ?
item = Item.find(params[:id])
item <<{ :status => "Success" }
render :json => item.to_json
