CODEWITHSUNDEEP
ruby-on-railscontroller
Serhii Bodnaruk
Serhii Bodnaruk

Reputation: 25

How can I create controller instance with params from another controller?

I need to create a controller instance from another controller for using its methods. When I creating 

c = SomeController.new
c.some_method

some_method use params[], and then I have an error NoMethodError: undefined method 'parameters' for nil:NilClass. How can I pass params to the controller?

Upvotes: 2

Views: 863

Answers (2)

max
max

Reputation: 102248

You don't instantiate controllers in Rails - its done by the router when it matches a request to a route.

Its just not done because it violates the way MVC in Rails works - one request = one controller. You also need to pass the entire env hash from rack into the controller for it even work properly.

But really - don't. There are much better ways.

If you need to share a method between controllers there are better ways such as using inheritance:

class ApplicationController
  def some_method
  end
end

class FooController < ApplicationController

end

class BarController < ApplicationController

end

Or mixins:

# app/controllers/concerns/foo.rb
module Foo
  def some_method
  end
end

class BarController < ApplicationController
  include Foo
end

class BazController < ApplicationController
  include Foo
end

If you instead need to move a request from one controller action to another you should be redirecting the user.

Upvotes: 0

wasipeer
wasipeer

Reputation: 1035

The thing you are trying to do it not recommended any framework. You probable have some code that you wanted in multiple controllers. To achieve your desired behavior, extract the common code to library can call that in any controller you want.

Upvotes: 2

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