Model description:
User, Widget, Purchase
User
has_many :purchases
has_many :widgets, :through => :purchases
Widget
has_many :purchases
has_many :users, :through => :purchases
Purchase
belongs_to :user
belongs_to :widget
Hope that makes sense and is correct for the below.
Right, in my controller, I have current_user.
I wish to render a nested JSON response for use eventually with jquery templates.
Like this would be ideal:
{
"purchases": [
{
"quantity": 200,
"price": "1.0",
"widget": {
"name": "Fantastic Widget",
"size": "Large"
}
},
{
"quantity": 300,
"price": "3.0",
"widget": {
"name": "Awesome Widget",
"size": "Medium"
}
}
]
}
This:
render :json => current_user.to_json(:include => [:purchases, :widgets])
Will render some current_user details (not really relevant) and then purchases and widgets at the same level.
This works (outputs some current user details but thats not my main gripe at the moment):
render :json => current_user.to_json({:include => :purchases })
But obviously only outputs purchase data. I cannot get a nested include to work (should it work?) even after looking at this sample:
konata.to_json(:inclu开发者_开发知识库de => { :posts => {
:include => { :comments => {
:only => :body } },
:only => :title } })
From here and this existing stackoverflow question.
So I've just got myself thoroughly confused. Help appreciated.
I would look into utilizing the as_json method in your models to get the desired output. Adding the following to your models should get you going in the right direction.
#users model
def as_json(options={})
{:purchases => self.purchases}
end
#purchases model
def as_json(options={})
{:quantity: self.quantity,
:price: self.price,
:widget: self.widget}
end
#widgets model
def as_json(options={})
{:name:self.name,
:size: self.size}
end
Once you've added these you'd simply user to_json
on your user instance and it should output correctly.
RABL lets you craft JSON views similar to the HTML ERB views.
This blog post, "If you’re using to_json
, you’re doing it wrong", explains a bit of background and the shortcomings of using to_json
.
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