使用RSpec测试Datamapper模型 [英] Testing Datamapper models with RSpec

问题描述

我正在使用RSpec测试使用DataMapper的Sinatra应用程序。

以下代码：

 它应更新商品的标题做
 lambda做
发表 / hello / edit，：params => {
：title => ‘再见’，
：body => 'goodbye world'
} 
 end。应该更改（Snippet，：title）.from（'hello'）。to（'goodbye'）
 end 
  

导致此错误：

标题应该最初是 hello，但是是＃< DataMapper :: Property :: String @ model = Snippet @ name =：title>

我当然可以通过删除lambda并仅检查是否满足以下条件来 hack ：

 片段。 first.title.should =='再见'
  

但这不是一个长期的解决方案，因为 .first 代码段将来可能会有所不同。

有人可以告诉我正确的语法吗？

谢谢。

 它应该更新item's title do 
 snippet = Snippet.first（：title => hello）
 post / hello / edit，：params => {
：title => ‘再见’，
：body => '再见世界'
} 
 snippet.reload.title.should =='再见'
结束
  

感谢@Dan Tao的回答对我有所帮助。

I'm testing a Sinatra application, which is using DataMapper, with RSpec.

The following code:

it "should update the item's title" do
  lambda do
    post "/hello/edit", :params => {
      :title => 'goodbye',
      :body  => 'goodbye world'
    }
  end.should change(Snippet, :title).from('hello').to('goodbye')
end

Results in this error:

title should have initially been "hello", but was #<DataMapper::Property::String @model=Snippet @name=:title>

I can of course hack this by removing the lambda and only checking if:

Snippet.first.title.should == 'goodbye' 

But that can't be a long term solution since the .first Snippet may not be the same in the future.

Can someone show me the right syntax?

Thanks.

解决方案

I finally fixed it using:

it "should update the item's title" do
  snippet = Snippet.first(:title => "hello")
  post "/hello/edit", :params => {
    :title => 'goodbye',
    :body  => 'goodbye world'
  }
  snippet.reload.title.should == 'goodbye'
end

Thanks to @Dan Tao whose answer helped me.

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