在 grails 服务中使用 g.render [英] Using g.render in a grails service

问题描述

我正在尝试在 grails 服务中使用 g.render，但似乎默认情况下没有向服务提供 g.有没有办法让模板引擎在服务中呈现视图?我可能会以错误的方式解决这个问题.我希望将视图从部分模板呈现为字符串，并将结果字符串作为 JSON 响应的一部分发回，以便与 AJAX 更新一起使用.

I'm trying to use g.render in a grails service, but it appears that g is not provided to services by default. Is there a way to get the templating engine to render a view in the service? I may be going about this the wrong way. What I'm looking to to is render the view from a partial template to a string, and send the resulting string back as part of a JSON response to be used with AJAX updates.

有什么想法吗?

推荐答案

我完全同意 John 的论点 - 在服务中使用 GSP 通常是一个糟糕的设计决策.但没有规则无一​​例外！如果您仍然想这样做，请尝试以下方法:

I totally agree with John's argumentation - doing GSP in services is generally a bad design decision. But no rules without exceptions! If you still want to do this, try the following approach:

class MyService implements InitializingBean {
    boolean transactional = false
    def gspTagLibraryLookup  // being automatically injected by spring
    def g

    public void afterPropertiesSet() {
        g = gspTagLibraryLookup.lookupNamespaceDispatcher("g")
        assert g
    }

    def serviceMethod() {    
       // do anything with e.g. g.render
    }
}

使用 gspTagLibraryLookup bean，您当然可以访问服务中所有其他所需的 taglib.

Using the gspTagLibraryLookup bean you can of course access every other desired taglib in a service.

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