32、用户关注功能的实现与优化

用户关注功能的实现与优化

1. 关系模型的验证

在进一步深入之前，为了保证完整性，我们需要为关系模型添加一些验证。以下是相关的测试代码和应用代码：

测试代码（ spec/models/relationship_spec.rb ）

describe Relationship do
  describe "when followed id is not present" do
    before { relationship.followed id = nil }
    it { should not be valid }
  end
  describe "when follower id is not present" do
    before { relationship.follower id = nil }
    it { should not be valid }
  end
end

应用代码（ app/models/relationship.rb ）

class Relationship < ActiveRecord::Base
  attr accessible :followed id
  belongs to :follower, class name: "User"
  belongs to :followed, class name: "Us