Question

我使用此代码时遇到错误。

def create
  new_post
  @post.save!  

  (@post.users.uniq - [current_user]).each do |user|
    Notification.create(recipient: user, actor:current_user, action: "posted", notifiable: @post)
  end

redirect_to post_index_path

end

我不确定为什么会出现错误，但错误消息显示我使用“user”而不是“users”但我不能使用uniq这样做。我也犯了更多错误。

编辑：这是我的帖子模型：

class Post < ActiveRecord::Base
  has_many :comments
  belongs_to :user
  belongs_to :subject
  validates_presence_of :content
end

我也有一个科目模型：

class Subject < ActiveRecord::Base
  has_many :posts
  has_many :users, through: :posts
  validates_presence_of :name
  validates_uniqueness_of :name
end

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
    validates :name, presence: true

    has_many :listings, dependent: :destroy

    has_many :purchasing, class_name: "Transaction", foreign_key: "buyer_id", dependent: :destroy
    has_many :sell, class_name: "Transaction", foreign_key: "seller_id", dependent: :destroy


    has_many :purchased, class_name: "Archive", foreign_key: "buyer_id", dependent: :destroy
    has_many :sales, class_name: "Archive", foreign_key: "seller_id", dependent: :destroy

    has_many :selling_rooms, class_name: "Room", foreign_key: "seller_id", dependent: :destroy
    has_many :buying_room, class_name: "Room", foreign_key: "buyer_id", dependent: :destroy

    has_many :comments, through: :posts
    has_many :posts

    has_many :notifications, foreign_key: :recipient_id


    def can_buy?(listing_price)
    if self.points >= listing_price
      true
    else
      false
    end
  end

  def withdraw(listing_price)
    self.points -= listing_price
  end


  def purchasing_list
    purchasing.includes(:seller, :listing)
  end

  def purchased_list
    purchased.includes(:seller, :listing)
  end 

  def sell_list
    sell.includes(:seller, :listing)
  end

  def sales_list
    sales.includes(:seller, :listing)
  end
end

Answer 1

我猜你没有以正确的方式宣布这种关系; 你有Post模型吗？：

has_one :user

或者你宣布了

has_many :users

如果是第一个，则会出现当前行为。对于您期望的情况，在您的用户模型（user.rb）

中逻辑上是有意义的

has_many :posts

并在你的帖子模型中

belongs_to :user

用于＃<post：0xaa09664>的未定义方法`users'

1 个答案: