Rails: How to redirect to a specific controller (index) depending on condition-CodePudding

I have a Ruby on Rails application that can generate "roles" for actors in movies; the idea is that if a user looks at a movie detail page, they can click "add role", and the same if they look at an actor detail page. Once the role is generated, I would like to redirect back to where they came from - the movie detail page or the actor detail page... so in the controller's "create" and "update" method, the redirect_to should either be movie_path(id) or actor_path(id). How do I keep the "origin" persistent, i. e. how do I remember whether the user came from movie detail or from actor detail (and the id, respectively)?

CodePudding user response：

I would setup separate nested routes and just use inheritance, mixins and partials to avoid duplication:

resources :movies do
  resources :roles, module: :movies, only: :create
end

resources :actors do
  resources :roles, module: :actors, only: :create
end

class RolesController < ApplicationController 
  before_action :set_parent

  def create
    @role = @parent.roles.create(role_params)
    if @role.save 
      redirect_to @parent
    else
      render :new
    end
  end

  private 

  # guesses the name based on the module nesting
  # assumes that you are using Rails 6  
  # see https://stackoverflow.com/questions/133357/how-do-you-find-the-namespace-module-name-programmatically-in-ruby-on-rails
  def parent_class
    module_parent.name.singularize.constantize
  end

  def set_parent
    parent_class.find(param_key)
  end

  def param_key
    parent_class.model_name.param_key   "_id"
  end

  def role_params
    params.require(:role)
          .permit(:foo, :bar, :baz)
  end
end

module Movies
  class RolesController < ::RolesController
  end
end

module Actors
  class RolesController < ::RolesController
  end
end

# roles/_form.html.erb
<%= form_with(model: [parent, role]) do |form| %>
  # ...
<% end %>