订阅，计划，用户协会

Question

我的大脑越来越纠结。我有用户，他们可以有一个计划和一个订阅。我正在使用ryan bates示例进行订阅，除了我不知道如何将user_id纳入订阅之外，其他一切都在工作

这是我的订阅控制器。

class SubscriptionsController < ApplicationController
  before_action :authenticate_user!

  def new
    plan = Plan.find(params[:plan_id])
    @subscription = plan.subscriptions.build
  end

  def create
    @subscription = Subscription.new(subscription_params)
    if @subscription.save
      redirect_to @subscription, :notice => "Thank you for subscribing!"
    else
      render :new
    end
  end

  def show
    @subscription = Subscription.find(params[:id])
  end

  private

  def subscription_params
      params.require(:subscription).permit(:plan_id, :email, :user_id)
  end
end

这是我的用户模型

class User < ActiveRecord::Base
 # Include default devise modules. Others available are:
 # :confirmable, :lockable, :timeoutable and :omniauthable
  devise :database_authenticatable, :registerable,
     :recoverable, :rememberable, :trackable, :validatable, :confirmable

  has_many :videos
  has_many :votes
  has_many :favorites
  has_many :videos_with_votes, :through => :votes, :source => :video
  has_many :videos_with_favorites, :through => :favorites, :source => :video
  has_one :subscription
  has_one :plan, :through => :subscription
  has_attached_file :avatar, :styles => { :medium => "300x300#", :thumb => "80x80#" }

  def voted?(video)
    votes.exists?(video_id: video.id)
  end

  def favorited?(video)
    favorites.exists?(video_id: video.id)
  end

end

这是我的计划模型

class Plan < ActiveRecord::Base
  has_many :subscriptions
  has_many :users
end

这是我的订阅模式

class Subscription < ActiveRecord::Base
  belongs_to :plan
  belongs_to :user
  validates_presence_of :plan_id
  validates_presence_of :email
end