Grails从服务中呈现视图？ [英] Grails render view from service?

问题描述

我刚刚开始在Grails中使用服务，并且在尝试从服务内部呈现页面时遇到问题，我尝试了几个方法，如下所示，但没有运气：

服务呼叫1：

  GroupCheckService.isEnabled（userObjects.group。 notenabled）
  

服务尝试1：

  import grails.gsp.PageRenderer 
 $ b $ class GroupCheckService {
 
 PageRenderer groovyPgeRenderer 
 static transactional = false 
 $ b $ def isEnabled（boolean notenabled）{
 
 if（notenabled == true）{
 groovyPgeRenderer.render（view：'/ locked'）
 
} else {
 return 
} 
 
} 
} 
  

服务呼叫2：

  GroupCheckService.isEnabled（ render，userObjects.group.notenabled）
  

服务尝试2：

  class GroupCheckService {
 
 PageRenderer groovyPgeRenderer 
 static transactional = false 
 $ b $ def isEnabled（Closure render，boolean notenabled）{
 
 if（notenabled == true）{
 render .call view：/ locked
 
} else {
 return 
} 
 
} 
} 
  
 
 $ b现在当我尝试方法1时，我没有收到错误，但是当IF满足时，页面不会呈现，方法2我得到以下错误：
 
 
  no such property render 
  
我真的很感谢一些建议或帮助如何实现这一点，在此先感谢：）     
 
 
 
将服务用于业务逻辑和/或（事务性的）数据库操作s。
 
 
 
从 grails docs  b 
 $ b 
 
 
 Grails中的服务是将大部分逻辑放入应用程序的地方，让控制器负责处理请求流重定向等。
 
 
如果你真的想从服务渲染视图， mrhaki已经有博客关于使用 PageRenderer  
 
 导入grails.gsp.PageRenderer 
 
类GroupCheckService {
 PageRenderer groovyPageRenderer 
 $ b def isEnabled（Closure render，boolean notenabled）{
 if（notenabled == true）{
 groovyPageRenderer.render view：/ locked
 } else {
 return 
} 
} 
} 
  
请注意，由于 PageRenderer 不在请求范围内，所以不能使用 Sitemesh 布局。
 
 
 
最好的方法是重新设计你的应用程序，把渲染的东西留在控制器中。
 
I am just starting to use Services in Grails and I am having an issue when trying to render a page from inside a service, I have tried a few methods as shown below with no luck:

Service Call 1:
GroupCheckService.isEnabled(userObjects.group.notenabled)
Service Attempt 1:
import grails.gsp.PageRenderer

class GroupCheckService {

    PageRenderer groovyPgeRenderer
    static transactional = false

    def isEnabled(boolean notenabled) {

        if(notenabled == true){
            groovyPgeRenderer.render(view: '/locked')

        }else{
            return
        }

    }
}
Service Call 2:
GroupCheckService.isEnabled(render, userObjects.group.notenabled)
Service Attempt 2:
class GroupCheckService {

    PageRenderer groovyPgeRenderer
    static transactional = false

    def isEnabled(Closure render, boolean notenabled) {

        if(notenabled == true){
            render.call view:"/locked"

        }else{
            return
        }

    }
}
Now when I try method 1 I don't get an error but the page is not rendered when the IF is satisfied, with method 2 I get the following error:
no such property render
I would really appreciate some advise or help on how to achieve this, thanks in advance :)
解决方案
You shouldn't render views from service - this is a part for the controller.

Use the service for business logic and/or (transactional) database operations.

From grails docs:

  
Services in Grails are the place to put the majority of the logic in your application, leaving controllers responsible for handling request flow with redirects and so on.
If you realy want to render a view from service, mrhaki has blogged about using the PageRenderer from service.
import grails.gsp.PageRenderer

class GroupCheckService {
    PageRenderer groovyPageRenderer

    def isEnabled(Closure render, boolean notenabled) {
        if(notenabled == true){
            groovyPageRenderer.render view: "/locked"
        }else{
            return
        }
    }
}
Notice that you can't use Sitemesh layouts due to the PageRenderer works outside of the request scope.

The best way is to redesign your application to leave the render stuff in the controller.

                        
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