Rails 没有为我的 wiki 对象分配用户 ID

Question

我是一名初学者，现在已经学习 Ruby on Rails 大约 4 个月了。

我正在构建一个应该允许私人 wiki 的基本 wiki 应用程序。现在，当用户创建 wiki 时，rails 不会为 wiki 分配用户 ID。当我在 Rails 控制台中查看 wiki 时，一切都在那里 - created_at、title、body、wiki id - 但 user_id 始终为零。我怎样才能解决这个问题？

这是我的 Wiki 控制器：

class WikisController < ApplicationController
      def index

        @wikis = Wiki.all     
      end

      def new
        @wiki =Wiki.new
        authorize @wiki
      end

      def show
        @wiki = Wiki.find(params[:id])
      end

      def edit
        @wiki = Wiki.find(params[:id])
        authorize @wiki
      end

      def update
        @wiki = Wiki.find(params[:id])
        authorize @wiki
        if @wiki.update_attributes(wiki_params)
          flash[:notice] = "Wiki was updated."
          redirect_to @wiki
        else
          flash[:error] = "There was an error updating the wiki."
          render :edit
        end
      end

      def create
        @wiki = Wiki.new(wiki_params)
        authorize @wiki
        if @wiki.save
          flash[:notice] = "Wiki was saved."
          redirect_to @wiki
        else
          flash[:error] = "There was an error saving the wiki. Please try again."
          render :new
        end 
      end

      def destroy
        @wiki = Wiki.find(params[:id])
        name = @wiki.title
        if @wiki.destroy
          flash[:notice] =  "\"#{name}\" was deleted."
          redirect_to wikis_path
          else
          flash[:error] = "There was an error deleting the wiki."
          redirect_to @wiki
        end
      end
    end

    private

      def wiki_params 
        params.require(:wiki).permit(:title, :body, :private, :user_id)
      end

...这是我的模型：

    class User < ActiveRecord::Base


    def admin?
      role == 'admin'
    end

    def member?
      role == 'member'
    end

    def premium_member?
      role == 'premium_member'
    end


    has_many :collaborations
    has_many :wikis, through: :collaborations

      devise :database_authenticatable, :registerable,
             :recoverable, :rememberable, :trackable, :validatable, :confirmable

    end

加入表...

class Collaboration < ActiveRecord::Base
  belongs_to :user
  belongs_to :wiki
end

维基模型...

class Wiki < ActiveRecord::Base
  has_many :collaborations
  has_many :users, through: :collaborations

end

最后是架构：

create_table "collaborations", force: true do |t|
    t.integer "user_id"
    t.integer "wiki_id"
  end

  create_table "users", force: true do |t|
    t.string   "name"
    t.string   "role",                   default: "member", null: false
    t.string   "email",                  default: "",       null: false
    t.string   "encrypted_password",     default: "",       null: false
    t.string   "reset_password_token"
    t.datetime "reset_password_sent_at"
    t.datetime "remember_created_at"
    t.integer  "sign_in_count",          default: 0,        null: false
    t.datetime "current_sign_in_at"
    t.datetime "last_sign_in_at"
    t.string   "current_sign_in_ip"
    t.string   "last_sign_in_ip"
    t.string   "confirmation_token"
    t.datetime "confirmed_at"
    t.datetime "confirmation_sent_at"
    t.string   "unconfirmed_email"
    t.datetime "created_at"
    t.datetime "updated_at"
  end

  add_index "users", ["email"], name: "index_users_on_email", unique: true
  add_index "users", ["reset_password_token"], name: "index_users_on_reset_password_token", unique: true

  create_table "wikis", force: true do |t|
    t.string   "title"
    t.string   "body"
    t.integer  "user_id"
    t.datetime "created_at"
    t.datetime "updated_at"
    t.boolean  "private",    default: false
  end

Answer 1

如果您说一个wiki has_many :users, through: :collaborations，那么wiki 上的user_id 列将不会被rails 自动填充。相反，它应该将wiki_id 和user_id 保存为collaborations 表中的一行。否则，一个 wiki 只能有一个用户，对吧？

如果您真的想在 wiki 表格列上保存 user_id，您可以在 wiki 模型上的 callback 中执行此操作。