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我正在尝试为我的应用程序制作一个超级简单的投票系统。但是当我尝试创建一个新的投票模型时，它总是设置为零。我一直在看这个，不能告诉我做错了什么，请帮忙。

这是一个 menu_item 的示例

 #<MenuItem id: 3, food_item_id: 1, menu_id: 1, created_at: "2013-09-20 03:27:45", updated_at: "2013-09-20 03:27:45", vote_id: nil>]>

当我尝试在 IRB 中创建一个

tyler = Vote.new
 => #<Vote id: nil, votes: 0, menu_item_id: nil, created_at: nil, updated_at: nil>

楷模

class MenuItem < ActiveRecord::Base
  belongs_to :menu
  belongs_to :food_item

  belongs_to :vote

class Vote < ActiveRecord::Base
  has_many :menu_items
end

控制器

class MenuItemsController < ApplicationController

  def new
    @menu_item = MenuItem.new
  end

  def index
    @menu_items = MenuItem.all
  end

  def create
    @menu_item = MenuItem.new(menu_item_params)
    @vote = Vote.new
    @menu_item.vote_id = @vote.id
    @menu_item.save
    redirect_to menus_path
  end
end

class VotesController < ApplicationController
  def new
    @vote = Vote.new
  end

  def create
    @vote = Vote.new
    @vote.save
    redirect_to menus_path
  end

  def vote_params
    params.require(:vote).permit()
  end
end

图式

ActiveRecord::Schema.define(version: 20130920030317) do

  create_table "food_items", force: true do |t|
    t.string   "name"
    t.text     "description"
    t.datetime "created_at"
    t.datetime "updated_at"
  end

  create_table "menu_items", force: true do |t|
    t.integer  "food_item_id"
    t.integer  "menu_id"
    t.datetime "created_at"
    t.datetime "updated_at"
    t.integer  "vote_id"
  end

  create_table "menus", force: true do |t|
    t.date     "day"
    t.datetime "created_at"
    t.datetime "updated_at"
  end

  create_table "votes", force: true do |t|
    t.integer  "votes",        default: 0
    t.integer  "menu_item_id"
    t.datetime "created_at"
    t.datetime "updated_at"
  end

  add_index "votes", ["menu_item_id"], name: "index_votes_on_menu_item_id"

end
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1 回答 1

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An instance of the Vote model will have all of its attributes set to nil by default until it is saved, at which point it will get an id and the timestamp fields (created_at and updated_at) will be set. If you want the Vote model instance to have values when it is created, use the syntax tyler = Vote.new(:votes => 3, :menu_item_id => 3) and the newly created vote will have its votes and menu_item_id attributes set.

于 2013-09-20T03:50:09.187 回答