By inspecting which input's you call on simple_form_for, a session variable is generated in order to automatically do strong parameters for the next posted content, making it even more simple and easy to write controllers, because you can leave out the maintenence of *_params-methods completely!

Simply call simple_form_strong_parameters_for instead of simple_form_for and simple_form_strong_parameters(:model_name) instead of model_params.

This project uses MIT-LICENSE.

Add to Gemfile:

gem 'simple_form_strong_parameters'

In your form use simple_form_strong_parameters_for instead of simple_form_for (but use it as normally):

<%= simple_form_strong_parameters_for @user do |f| %>
 <%= f.input :name %>
<% end %>

In your controller do like this:

class UsersController < ApplicationController
  def new
    @user = User.new
  end

  def create
    @user = User.create!(simple_form_strong_parameters(:user))
    redirect_to user_path(@user)
  end
end

If a field that hasn't been defined as an input is present in the params, then a ActiveModel::ForbiddenAttributesError error will be raised as normally.

You no longer have to maintain a user_params-method every time you change your form!