为什么装饰器会失败？

Question

我的装饰器有问题：

class ReviewDecorator < Draper:Decorator
  delegate_all

  def author
    @author = User.find_by(review.user_id)
    "#{@author.firstname} #{@author.lastname}"
  end
end

每次我测试这个装饰器时，我都会收到这个错误：

ReviewDecorator#author displays review author fullname Failure/Error: expect(review.author).to eq 'John Doe' NoMethodError: undefined method firstname' for nil:NilClass # ./app/decorators/review_decorator.rb:7:inauthor' # ./spec/decorators/review_decorator_spec.rb:10:in `block (3 levels) in '

Rspec 测试：

require 'spec_helper'

describe ReviewDecorator do

  let(:user) { build(:user, firstname: 'John', lastname: 'Doe') }
  let(:review) { described_class.new(build(:review, user: user)) }

  describe '#author' do
    it 'displays review author fullname' do
      expect(review.author).to eq 'John Doe'
    end
  end
end

我做错了什么？

Answer 1

根据你的测试文件，代码应该是这样的。

class ReviewDecorator < Draper:Decorator
  delegate_all

  def author
    "#{user.firstname} #{user.lastname}"
  end
end

为什么装饰器会失败？

Why does decorator fail?

ruby-on-rails

draper