在Grails的布局视图中访问模型 [英] Accessing the model from a layout view in Grails

问题描述

我在Grails中使用布局支持（sitemesh），它工作正常。我想调整我的布局以取决于用户是否登录。

我的grails-app / views / layouts / main。 gsp包含以下代码：

 < g：if test =$ {user}> 
用户名：$ {user.username} 
< / g：if> 
  

但是，看起来布局-GSP：无法访问模型，因此用户变量（我尝试时遇到无会话异常）。

预先感谢！

我的布局的推荐方式取决于用户是否登录或不是？

解决方案

为此，我建议使用请求或会话范围。可能最干的方式是填充范围是一个过滤器。例如在文件grails-app / conf / SecurityFilters.groovy中（您需要创建它）：

  class SecurityFilters {
 
 def filters = {
 populateCurrentUser（controller：'*'，action：'*'）{
 before = {
 request.user = User.get （session.userId）
} 
} 
} 
} 
  

该示例假定您将当前用户的标识存储在会话属性userId中，并且您拥有一个Domain类User。在布局中使用它很简单：

 < g：if test =$ {request.user} > 
当前用户：$ {request.user.username} 
< / g：if> 
  

I'm using the layout support (sitemesh) in Grails which works fine. I'd like to adjust my layout to have it depend on whether or not a user is logged in or not.

My grails-app/views/layouts/main.gsp contains the following code:

<g:if test="${user}">
  Username: ${user.username}
</g:if>

However, it appears as if the layout-GSP:s are unable to access the model and hence the user variable (I get a "No session" exception when trying). What would be the recommended way to make my layout depend on whether or not a user is logged in or not?

Thanks in advance!

解决方案

I would suggest to use either the request or the session scope for that purpose. Probably the most DRY way is to populate the scope is a filter. For example in the file grails-app/conf/SecurityFilters.groovy (you'll need to create it):

class SecurityFilters {

    def filters = {
        populateCurrentUser(controller: '*', action: '*') {
            before = {
                 request.user = User.get(session.userId)
            }
        }
    }
}    

The example assumes that you store the id of the current user in the session attribute "userId" and that you have a Domain class "User". Using it in the layout is as simple as this:

<g:if test="${request.user}">
   Current User: ${request.user.username}
</g:if>

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