将一个变量添加到grails中的所有视图 [英] Adding a variable to all views in grails

问题描述

我试图为所有视图中的当前用户（POJO）设置一个变量，以便我可以获取用户名等内容并检查其在每个视图（包括默认布局）上的角色。我如何在grails中设置一些东西（例如currentUser），以便在每个Grails视图中都可以这样访问：

I am trying to set a variable for the current user (a POJO) in all views so I can get things like the user name and check their role on every view (including the default layout). How can I setup something (e.g. currentUser) in grails so that it is accessible in every grails view like so:

<div>${currentUser.name}</div>

或者像这样：

or like this:

<g:if test="${currentUser.admin}">ADMIN</g:if>

推荐答案

您想使用 grails过滤器。使用过滤器，您可以指定您想要在前/后和afterView方法中使用哪些控制器和方法（使用通配符）。

You want to use a grails filter. Using a filter, you can specify which controllers and methods (using wild cards) you want to intercept using before/after and afterView methods.

这可以很容易地填充将新变量放入模型中，以便在视图中可用。下面是一个使用acegi插件authenticateService的例子：

This makes it easy to stuff a new variable into the model so it's available in a view. Here's an example that uses the acegi plugin authenticateService:

class SecurityFilters {

    def authenticateService

    def filters = {
        all(controller:'*', action:'*') {
            after = { model ->
                def principal = authenticateService.principal()
                if (principal != null && principal != 'anonymousUser') {
                    model?.loggedInUser = principal?.domainClass
                    log.debug("SecurityFilter: adding current user to model = $model")
                } else {
                    log.debug("SecurityFilter: anonymous user, model = $model")
                }
            }
        }
    }    
}

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