爲什麼我的Rails應用程序在Heroku上生成不需要的屬性？

Question

我開發了一個應用程序，允許登錄用戶（廚師）爲食譜添加評論，我在開發中首先對其進行了測試，並且運行良好，但是當我將它部署到Heroku時，該應用程序無法正常工作，所以我跑到了終端「Heroku的運行軌道控制檯」來檢查發生什麼，所以我得到以下：以上

@recipes = Recipe.first 
=> #<Recipe id: 1, name: "RecipeOne", description: "Potato\r\nSausage", 
created_at: "2017-09-16 00:58:19", updated_at: "2017-09-16 00:58:19", chef_id: 
1> 

@comment = @recipe.comments.build(description:'a delicious recipe') 
=> #<Comment id: nil, description: "a delicious recipe", chef_id: nil, 
recipe_id: 1, created_at: nil, updated_at: nil> 

@chef = Chef.last 
D, [2017-09-16T16:02:27.645527 #4] DEBUG -- : Chef Load (1.9ms) SELECT 
"chefs".* FROM "chefs" ORDER BY "chefs"."id" DESC LIMIT $1 [["LIMIT", 1]] 
=> #<Chef id: 2, name: "Wamba", email: "wamba@goths.com", created_at: "2017- 
09-16 01:13:36", updated_at: "2017-09-16 01:13:36", password_digest: 
"$2a$10$WiIVsMk25EurnDaByNDNH.hWONivodBcvP8.cQJk8cM...", admin: false> 

@comment.chef = @chef 
=> #<Chef id: 2, name: "Wamba", email: "wamba@goths.com", created_at: "2017- 
09-16 01:13:36", updated_at: "2017-09-16 01:13:36", password_digest: 
"$2a$6786544310$WiIVsMk25EurnDaByNDNH67428.hWONiv8900odBcvP8.cQJk8cM...", admin: false> 

完美的作品，但是當我鍵入@ comment.save，它失敗：

@comment.save 
D, [2017-09-16T16:04:22.305141 #4] DEBUG -- : (7.4ms) BEGIN 
D, [2017-09-16T16:04:22.354525 #4] DEBUG -- : (9.5ms) ROLLBACK 
=> false 

所以，我檢查了我的@recipe和@chef是有效的，@chef是有效的，但@recipe無效，但是因爲@comment無效。所以我檢查@評論

@comment.errors 
=> #<ActiveModel::Errors:0x0000000288d770 @base=#<Comment id: nil, 
description: "a delicious recipe", chef_id: 2, recipe_id: 1, created_at: nil, 
updated_at: nil>, @messages={:article=>["must exist"]}, @details={:article=> 
[{:error=>:blank}]}> 

我想知道什麼是文章和爲什麼我需要驗證一個不存在的屬性？我檢查了schema.rb，並且運行了'Heroku pg：psql'，我找不到關於：article屬性的信息。我敢肯定：文章不在我的模特中。

#schema.rb 
    ActiveRecord::Schema.define(version: 20170912043409) do 

    create_table "chefs", force: :cascade do |t| 
    t.string "name" 
    t.string "email" 
    t.datetime "created_at", null: false 
    t.datetime "updated_at", null: false 
    t.string "password_digest" 
    t.boolean "admin", default: false 
    end 

    create_table "comments", force: :cascade do |t| 
     t.text "description" 
     t.integer "chef_id" 
     t.integer "recipe_id" 
     t.datetime "created_at", null: false 
     t.datetime "updated_at", null: false 
    end 

    create_table "ingredients", force: :cascade do |t| 
     t.string "name" 
    end 

    create_table "recipe_ingredients", force: :cascade do |t| 
     t.integer "recipe_id" 
     t.integer "ingredient_id" 
    end 

    create_table "recipes", force: :cascade do |t| 
     t.string "name" 
     t.text "description" 
     t.datetime "created_at", null: false 
     t.datetime "updated_at", null: false 
     t.integer "chef_id" 
    end 

    end 

型號：

#comment.rb 
class Comment < ApplicationRecord 
    validates :description, presence: true, length: {minimum: 4, maximum: 140} 
    belongs_to :chef 
    belongs_to :recipe 
    validates :chef_id, presence: true 
    validates :recipe_id, presence: true 
    default_scope -> {order(updated_at: :desc)} 
    end 

#recipe.rb 
class Recipe < ApplicationRecord 
    validates :name, presence: true 
    validates :description, presence: true, length: {minimum: 5, maximum:500} 
    belongs_to :chef 
    validates :chef_id, presence: true 
    default_scope-> { order(updated_at: :desc) } 
    has_many :recipe_ingredients 
    has_many :ingredients, through: :recipe_ingredients 
    has_many :comments, dependent: :destroy 
    end 

#chef.rb 
class Chef < ApplicationRecord 
    before_save {self.email = email.downcase} 
    validates :name, presence: true, 
       length: {maximum: 30} 
    VALID_EMAIL_REGEX = /\A[\w+-.]+@[a-z\d\-.]+\.[a-z]+\z/i 
    validates :email, presence: true ,length:{maximum: 255}, 
       format:{with: VALID_EMAIL_REGEX}, 
       uniqueness:{case_sensitive: false} 
    has_many :recipes, dependent: :destroy 
    has_secure_password 
    validates :password, presence: true, length:{minimum: 5}, allow_nil: true 
    has_many :comments, dependent: :destroy 
    end 

#recipe_ingredient.rb 
class RecipeIngredient< ApplicationRecord 
    belongs_to :ingredient 
    belongs_to :recipe 

    end 

#ingredient.rb 
class Ingredient <ApplicationRecord 
    validates :name, presence: true, length: {minimum: 3, maximum: 25} 
    validates_uniqueness_of :name 
    has_many :recipe_ingredients 
    has_many :recipes, through: :recipe_ingredients 
    end 


rails -v => Rails 5.1.3 
ruby -v => ruby 2.4.0p0 (2016-12-24 revision 57164) [x86_64-darwin15] 

你有什麼真正發生的任何想法？

Answer 1

由於該錯誤只在生產中出現，所以我刪除了在生產（這是自動生成的）文章驗證以供評論。 class_eval。

comment.rb

class Comment < ApplicationRecord 

    validates :description, presence: true, length: {minimum: 4, maximum: 140} 
    belongs_to :chef 
    belongs_to :recipe 
    validates :chef_id, presence: true 
    validates :recipe_id, presence: true 
    default_scope -> {order(updated_at: :desc)} 

if Rails.env.production? 
Comment.class_eval do 
    _validators[:article] 
    .find { |v| v.is_a? ActiveRecord::Validations::PresenceValidator } 
    .attributes 
    .delete(:article) 
    end 
end 
end 

我認爲這是一個錯誤的軌道，無論如何，感謝那些誰試圖幫助我。