ruby-on-rails-3 - Rails 3 - 通过 rspec 正确测试 PUT 方法

Question

我有模型 TeacherLeader，它为其他表保留外键。我可以更新此表并尝试为我的 Controller 编写测试(通过 rspec)。

我的模型:

#  id         :integer         not null, primary key
#  user_id    :integer
#  teacher_id :integer
#

class TeacherLeader < ActiveRecord::Base  
  belongs_to :user
  belongs_to :teacher

  validates :teacher_id, 
              :uniqueness => { :message => "already a class-head" }
end

我的 Controller

class TeacherLeadersController < ApplicationController
 def edit
    @teacher_leader = TeacherLeader.find( params[:id] )    
    ...
  end

  def update
    @teacher_leader = TeacherLeader.find( params[:id] )
    ...

    if ( @teacher_leader.update_attributes( params[:teacher_leader] ) )                   
      redirect_to teachers_path
      ...
    else
      redirect_to edit_teacher_leader_path
      ...
      end      
    end
  end
end

因此，我在为 PUT 编写测试时遇到了问题。这是我的 PUT 方法代码示例:

describe TeacherLeadersController do
  render_views

  before(:each) do    
    @teacher = Factory( :teacher )
    @teacher.user.user_role = "teacher"
    @teacher.save!

    @user = Factory( :user, :user_login => Factory.next(:user_login) )
    @user.user_role = "class_head"
    @user.save!

    @sh = Factory( :user, :user_login => Factory.next(:user_login)  )
    @sh.user_role = "school_head"
    @sh.save!
  end

  describe "PUT 'update" do
    before(:each) do
      @teacher_leader = @user.create_teacher_leader( @attr_teacher_leader )
    end

    describe "for signed-in school-heads" do
      before(:each) do
        test_sign_in( @sh )
      end

      it "should update teacher leader with correct params" do
        put :update, :id => @teacher_leader, :teacher_id => @teacher.id
        @teacher_leader.reload
        @teacher_leader.teacher_id.should  == @teacher.id
      end
    end
  end
end

当我尝试运行我的规范时，我得到了:

1) TeacherLeadersController PUT 'update for signed-in school-heads should update teacher leader with correct params
     Failure/Error: put :update, :id => @teacher_leader, :teacher_id => @teacher.id
     NoMethodError:
       undefined method `[]' for nil:NilClass
     # ./app/controllers/teacher_leaders_controller.rb:57:in `update'
     # ./spec/controllers/teacher_leaders_controller_spec.rb:150:in `block (4 levels) in <top (required)>'

但我的应用程序有效!我在测试中做错了什么？

Answer 1

您的 Controller 需要一个 params[:teacher_leader] 哈希，但您的测试没有提供它。试试这个:

it "should update teacher leader with correct params" do
  put :update, :id => @teacher_leader, :teacher_leader => { :teacher_id => @teacher.id }
  # ...