ActiveRecord::AssociationTypeMismatch: 预期用户（#70180695416600），得到哈希（#70180672006440）

Question

我正在 ROR 上试驾一款社交网络应用

我会让代码自己说话：

用户.rb：

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

  has_many :friendships, dependent: :destroy
  has_many :inverse_friendships, class_name: "Friendship", foreign_key: "friend_id", dependent: :destroy

  def request_friendship(user_2)
    self.friendships.create(friend: user_2)
  end
end

友谊.rb：

class Friendship < ActiveRecord::Base
  belongs_to :user
  belongs_to :friend, class_name: "User"

  def accept_friendship
    self.update_attributes(state: "active", friended_at: Time.now)
  end

  def deny_friendship
    self.destroy
  end

  def cancel_friendship
    self.destroy
  end
end

和我的用户模型测试.. user_spec.rb：

require 'spec_helper'

describe User, :type => :model do
  let!(:user1) { User.create(email: 'test_user1@example.com', password: 'testtest', password_confirmation: 'testtest') }
  let!(:user2) { User.create(email: 'test_user2@example.com', password: 'testtest', password_confirmation: 'testtest') }

  it "new user has no friendships" do
    expect(user1.friendships.length).to eq 0
  end

  it "can add another user as a friend" do
    user2 = User.create(email: 'test_user2@example.com', password: 'testtest', password_confirmation: 'testtest')
    user1.request_friendship(friend: user2)
    expect(user1.friendships.length).to eq 1
  end
end

当我运行此测试时，我收到以下错误：

2) User can add another user as a friend
     Failure/Error: self.friendships.create(friend: user_2)

     ActiveRecord::AssociationTypeMismatch:
       User(#70180695416600) expected, got Hash(#70180672006440)
     # ./app/models/user.rb:11:in `request_friendship'
     # ./spec/models/user_spec.rb:13:in `block (2 levels) in <top (required)>'

我希望我能提供更多详细信息，但代码相当基本，我只是不确定如何在我的用户模型上测试 .request_friendship 方法。

提前致谢！

Answer 1

user1.request_friendship(friend: user2)

在friend: user2 这一行中，你传递了 n 个哈希，这个哈希

{ :friend => user2 }

但该方法需要用户。所以

user1.request_friendship(user2)