如何在 rails 控制台中使用 let 变量? [英] How to use let variables in rails console?

问题描述

使用

rspec 2.6.4
rails 3.1.6

如何在 Rails 测试控制台中使用 let 变量?

How to use let variables in rails test console?

1.9.3-p0 :032 > let(:user) { create(:user) }
NoMethodError: undefined method `let' for main:Object

请告知，这里应该需要哪个库?

Please advise, which library should be required here?

例如:下面在控制台中执行以在控制台中使用stub方法.

For example: below is executed in console to use stub methods in console.

require 'rspec/mocks/standalone'

是否可以在 rails 控制台中定义和调用 let 变量?

Is it possible, to define and call let variables in rails console?

推荐答案

如果你对 let 只是创建全局变量没问题，你可以像这样 polyfill:

If you are fine with let just creating globals, you can polyfill it like this:

def let(name)
  Object.send :instance_variable_set, "@#{name}", yield
  Object.send :define_method, name do
    Object.send :instance_variable_get, "@#{name}"
  end
end

用法与 rspec 相同:

Usage is the same as rspec:

irb(main):007:0> let(:foo) { 1 }
=> :foo
irb(main):008:0> foo
=> 1

虽然你真的不应该将你的测试代码粘贴到控制台来调试它.最好使用像 pry 或 byebug 这样的断点工具.

though you really shouldn't be pasting your test code into console to debug it. It's much better to use a breakpoint tool like pry or byebug.

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