我正在关注 Michael Hartl 的教程，并尝试实现类似 twitter 的回复功能，即。“ @122-john-smith：你好”应该是对用户122的回复。
我首先尝试使用 a 过滤“@XXX-AAA-AAA”部分before_filter，但我决定先在相同的Micropost#create操作中尝试它。到目前为止，我有这个MicropostController：
class MicropostsController < ApplicationController
before_filter :signed_in_user, only: [:create, :destroy]
before_filter :correct_user, only: [:destroy]
#before_filter :reply_to_user, only: [:create]
def index
end
def create
@micropost=current_user.microposts.build(params[:micropost])
#Rails.logger.info "hoooola"
regex=/\A@(\d)+(\w|\-|\.)+/i
message=@micropost.content.dup
isResponse=message.match(regex)[0].match(/\d+/)[0]
@micropost.response=isResponse
if @micropost.save
flash[:success]="Micropost created!"
redirect_to root_path
else
@feed_items=[]
render 'static_pages/home'
end
end
def destroy
@micropost.destroy
redirect_to root_path
end
private
def correct_user
@micropost = current_user.microposts.find_by_id(params[:id])
redirect_to root_path if @micropost.nil?
end
def reply_to_user
regex=/\A@(\d)+(\w|\-|\.)+/i
#I use [0] cause the output of match is a MatchData class with lots of bs
mtch=params[:micropost][:content].match(regex)[0]
#puts mtch
#@micropost=current_user.microposts.build(params[:micropost])
if mtch != nil
user_id=mtch.match(/\d+/)[0]
@replied_user=User.find(user_id)
@micropost.response=user_id unless @replied_user.nil?
end
end
end
这是我试图通过的片段测试：
require 'spec_helper'
describe "MicropostPages" do
subject { page }
let(:user) { FactoryGirl.create(:user) }
before { valid_signin user }
describe "micropost creation" do
before { visit root_path }
describe "with invalid information" do
it "should not create a micropost" do
expect { click_button "Post" }.should_not change(Micropost,
:count)
end
describe "error messages" do
before { click_button "Post" }
it { should have_content('error') }
end
end
describe "with valid information" do
before { fill_in 'micropost_content', with: "Lorem ipsum" }
it "should create a micropost" do
expect { click_button "Post" }.should change(Micropost,
:count).by(1)
end
end
end
...
end
如果我运行这些测试，我会收到以下错误：
Failures:
1) MicropostPages micropost creation with invalid information should not create a micropost
Failure/Error: expect { click_button "Post" }.should_not change(Micropost, :count)
NoMethodError:
undefined method `[]' for nil:NilClass
# ./app/controllers/microposts_controller.rb:14:in `create'
# (eval):2:in `click_button'
# ./spec/requests/micropost_pages_spec.rb:11:in `block (5 levels) in <top (required)>'
# ./spec/requests/micropost_pages_spec.rb:11:in `block (4 levels) in <top (required)>'
2) MicropostPages micropost creation with invalid information error messages
Failure/Error: before { click_button "Post" }
NoMethodError:
undefined method `[]' for nil:NilClass
# ./app/controllers/microposts_controller.rb:14:in `create'
# (eval):2:in `click_button'
# ./spec/requests/micropost_pages_spec.rb:14:in `block (5 levels) in <top (required)>'
但是，如果我修改测试并注释掉操作中的所有@XXX过滤Micropost#create：
def create
@micropost=current_user.microposts.build(params[:micropost])
#Rails.logger.info "hoooola"
#regex=/\A@(\d)+(\w|\-|\.)+/i
#message=@micropost.content.dup
#isResponse=message.match(regex)[0].match(/\d+/)[0]
#@micropost.response=isResponse
if @micropost.save
flash[:success]="Micropost created!"
redirect_to root_path
else
@feed_items=[]
render 'static_pages/home'
end
end
测试通过就好了，新Micropost的不是Nil对象。
这里似乎找不到解释。