Overriding existing CRUD action for specific model

[chrisbloom7]

I'd like to set an attribute, based on the current user, before the model is created. I've reviewed https://github.com/sferik/rails_admin/wiki/How-to-set-default-values and https://github.com/sferik/rails_admin/wiki/How-to-set-current_user-to-the-field, but I would like to do it during the #create action in the controller to prevent tampering. I saw a similar request at #756, but that was closed with the note "Closing because custom actions are already implemented." Ideally I'd just like to override the default create action to set the field and then call super to finish the processing. Is that possible, or do I need to impliment a custom action for this? And if so, how do I use that as the default create action for this particular model? Can you point me at an example?

[fmh]

+1 #1865

or maybe use an AR observer : http://api.rubyonrails.org/v3.2.15/classes/ActiveRecord/Observer.html

[fmh]

it works with AR observer , but AR Observers officially deprecated in Rails 4.0, i think it's not a good (clean) solution.

[cristianogregnanin]

i have same problem

[peresleguine]

I have one idea on this: http://stackoverflow.com/questions/22027759/rails-admin-setting-current-user-in-controller/22229565#22229565

[simonc]

Same issue here. I use a service object in the application and calling it from the admin would avoid ugly hacks :/

[alecslupu]

If you are using the authorization layer (I am using Pundit), you can create a custom policy, that will allow you to override as much as possible.
The action is implemented here: https://github.com/sferik/rails_admin/blob/master/lib/rails_admin/config/actions/new.rb
The interest area is on line 39: https://github.com/sferik/rails_admin/blob/master/lib/rails_admin/config/actions/new.rb#L39

@authorization_adapter && @authorization_adapter.attributes_for(:create, @abstract_model).each do |name, value|
  @object.send("#{name}=", value)
end

Using the pundit, add in your policy class a method like this:

class RoomPolicy < ApplicationPolicy
  def attributes_for(action)
    case action
    when :create
      { public: true, created_by_id: user.id }
    else
      {}
    end
  end

  class Scope < ApplicationPolicy::Scope
    # def resolve
    #   super
    # end
  end
end