How to accept JSON through Rails API without "_attributes" for nested fields

json, ruby-on-rails

Solution

You are free to perform some magic in your strong parameters methods. Based on what you want, you likely have this method in your controller:

def vintage_params
  params.require(:vintage).permit(:year, :name, :foo, { sizes: [:name, :quantity] })
end

All you'd need to do is adjust the name of the `sizes` key in that method. I'd recommend:

def vintage_params
  vintage_params = params.require(:vintage).permit(:year, :name, :foo, { sizes: [:name, :quantity] })
  vintage_params[:sizes_attributes] = vintage_params.delete :sizes
  vintage_params.permit!
end

This will remove the `:sizes` key and put it in the expected `:sizes_attributes` without messing up your pretty json. There is nothing you can do directly with `accepts_nested_attributes_for` to change the name.

Problem

I've written an API with Rails and need to accept some nested_attributes in API calls. Currently I send data via PATCH /api/v1/vintages/1.json ``` { "vintage": { "year": 2014, "name": "Some name", "foo": "bar", "sizes_attributes": [ { "name": "large", "quantity": "12" }, { "name": "medium", "quantity": "2" } ] } } ``` However, I'd like to perform the following: PATCH /api/v1/vintages/1.json ``` { "vintage": { "year": 2014, "name": "Some name", "foo": "bar", "sizes": [ { "name": "large", "quantity": "12" }, { "name": "medium", "quantity": "2" } ] } } ``` The difference being attributes being part of the key of the fields. I want to be able to `accept_nested_attributes_for :sizes` without having to use `_attributes` be a part of the JSON object. Anyone know how to manage this?

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