CODEWITHSUNDEEP
ruby-on-railsrubyruby-on-rails-4model-view-controller
Haywire Spark
Haywire Spark

Reputation: 113

Just need a variable, strong_params in rails

I would like to do something like:

class TestController < InheritedResources::Base

    def test_method
        self.var1 + self.var2
    end

  private

    def test_params
      params.require(:test).permit(:var1, :var2)
    end
end

Where in the view I could call from the built in controller index:

test.test_method

I've tried adding a create method to the controller as follows:

def create
    Test.create!(require(:test).permit(:var1, :var2, :test_method))
end

I've also tried updating the params directly:

 private

    def test_params
      params.require(:test).permit(:var1, :var2, :test_method)
    end

I've also tried making a helper method, but I knew that was doomed to fail because it wouldn't have access to var1 and var2.

I guess I just don't understand two things: one how to make my var1 and var2 white-listed so I can use them, and more importantly how to add a method to my model using strong parameters, because attr_accessible doesn't work in my models anymore.

EDIT:

Let me rephrase a little, maybe it will help. I can get access to individual Test objects in my view with a simple call to tests.each |test| in the view. I just want to make methods that act on my already defined active record variables for that object, hence var1 and var2. The problem is when I define a new method in my controller it is private to the object and I won't have access to it with a call from an instance of the object. Better yet, I would like to just be able to define a new variable, local to the object, that is created after it has propagated its other fields from the db.

EDIT2: I'm aware I'm probably missing the design pattern here. It can be hard to describe that I want X, when really I need Z. Thanks for the patience.

Thanks for the help.

Upvotes: 0

Views: 55

Answers (1)

iMacTia
iMacTia

Reputation: 671

There's no reason for white-listing parameters that you'll directly use. White-listing with strong parameters is useful only when you call function like ActiveRecord#update that simply take every key from the dictionary, so you can control with key you want to allow and which not. In this case, just do:

class TestController < InheritedResources::Base
  def test_method
    @result = params[:var1] + params[:var2]
  end
end

And in your view, just print the @result variable wherever you want

<%= @result %>

This is the Rails way. You can of course call the variable as you want. Helper methods are useful only for more complex cases.

Upvotes: 1

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