Wraps the parameters hash into a nested hash. This will allow clients to submit requests without having to specify any root elements.
This functionality is enabled by default for JSON, and can be customized by setting the format array:
class ApplicationController < ActionController::Base
wrap_parameters format: [:json, :xml]
end
You could also turn it on per controller:
class UsersController < ApplicationController
wrap_parameters format: [:json, :xml, :url_encoded_form, :multipart_form]
end
If you enable ParamsWrapper
for :json
format, instead of having to send JSON parameters like this:
{"user": {"name": "Konata"}}
You can send parameters like this:
{"name": "Konata"}
And it will be wrapped into a nested hash with the key name matching the controller’s name. For example, if you’re posting to UsersController
, your new params
hash will look like this:
{"name" => "Konata", "user" => {"name" => "Konata"}}
You can also specify the key in which the parameters should be wrapped to, and also the list of attributes it should wrap by using either :include
or :exclude
options like this:
class UsersController < ApplicationController
wrap_parameters :person, include: [:username, :password]
end
On Active Record models with no :include
or :exclude
option set, it will only wrap the parameters returned by the class method attribute_names
.
If you’re going to pass the parameters to an ActiveModel
object (such as User.new(params[:user])
), you might consider passing the model class to the method instead. The ParamsWrapper
will actually try to determine the list of attribute names from the model and only wrap those attributes:
class UsersController < ApplicationController
wrap_parameters Person
end
You still could pass :include
and :exclude
to set the list of attributes you want to wrap.
By default, if you don’t specify the key in which the parameters would be wrapped to, ParamsWrapper
will actually try to determine if there’s a model related to it or not. This controller, for example:
class Admin::UsersController < ApplicationController
end
will try to check if Admin::User
or User
model exists, and use it to determine the wrapper key respectively. If both models don’t exist, it will then fallback to use user
as the key.
To disable this functionality for a controller:
class UsersController < ApplicationController
wrap_parameters false
end
Constants
EXCLUDE_PARAMETERS | = | %w(authenticity_token _method utf8) |