我需要返回“渲染"吗?在 Grails 中? [英] Do I need to return "render" in Grails?

问题描述

有必要退货吗?假设它正在执行操作.

Is that return necessary? Let's say it's in the middle of an action.

render(contentType:'text/json', text: ['success': true] as JSON)    
return

推荐答案

如果不返回，render之后的任何代码也会被执行，这往往不是你想要的，例如

If you don't return, any code after render will also be executed, which is often not what you want, e.g.

def someAction = {

  if (someCondition) {
    render view: 'success'
    // if we don't return execution would fall through to the code below
    return  
  }

  log.error 'something went wrong'
  render view: 'error'
}

当然，如果你改用这个样式，就不用返回了

Of course, if you use this style instead, there's no need to return

def someAction = {

  if (someCondition) {
    render view: 'success'

  } else {    
    log.error 'something went wrong'
    render view: 'error'
  }
}

如果一个动作只有一个退出点，在render

If an action only has one exit point, there's no need to return after render

def someAction = {
    render view: 'success'
}

请记住，如果不返回，render 之后的代码将被执行.

Just remember that the code after render will be executed if you don't return.

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