我是否需要返回“渲染”在Grails中？ [英] Do I need to return "render" in Grails?

问题描述

这是必要的吗？

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

解决方案

如果你没有返回，那么 render 之后的任何代码也会被执行，这通常不是你想要的，例如



  def someAction = {
 
 if（someCondition）{
 render view：'success'
 //如果我们不
 return 
} 
 
 log.error'出错了'
渲染视图：'error'
} 
  

当然，如果您使用此样式，则无需返回

  def someAction = {
 
 if（someCondition）{
 render view：'success'
 
} else {
 log.error'出错了'
 render view：'error'
} 
 
 
 
 
 
 $ b如果一个动作只有一个退出点，那么不需要返回 render  
  def someAction = {
渲染视图：'success'
 
  
请记住 render 将会被执行，如果你没有返回。
 
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

解决方案
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'
}
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'
  }
}
If an action only has one exit point, there's no need to return after render
def someAction = {
    render view: 'success'
}
Just remember that the code after render will be executed if you don't return.

                        
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