为什么我在grails g：link标签创建的链接末尾看到双星号？ [英] Why do I see double asterisk at the end of links created by grails g:link tag?

问题描述

代码如下：

The code like this:

<g:link controller="category" action="show" id="${category.id}">${category.name}</g:link>

产生下一个链接：

produces the next link:

<a href="/shop/categories/show/1/**">Test category</a>

为什么会发生这种情况，以及如何删除这个看起来不好看的双星号？

Why does it happen and how to remove this bad-looking double asterisk?

推荐答案

来自您的评论：

From your comment:

URLMappings包含 /类别/ $动作？/ $ ID？/ **？。但我真的很想告诉Grails，我不关心URL是否包含了一些不必要的部分。

URLMappings contains this "/categories/$action?/$id?/**?". But I really want to tell grails that I don't care if URL contains some unnecessary parts after the meaningful part.

未绑定的通配符 * 和 ** ）为转发URL映射做正确的事情（例如，接收传入的请求URI和映射它使用参数控制器操作），但是，查看默认 RegexUrlMapping 的源代码，如果您尝试反向使用这样的映射，则 * 和 ** 组件将逐字地包含在生成的URL中。为了能够生成合理的URL，映射的每个段都必须是文字或绑定到命名变量，因此生成器可以知道应该使用什么（可能为空）值来替换通配符。

Unbound wildcards (* and **) do the right thing for "forward" URL mappings (i.e. taking an incoming request URI and mapping it to a controller action with parameters) but, looking at the source code for the default RegexUrlMapping, if you try to use such a mapping in reverse the * and ** components will be included literally in the generated URL. In order to be able to generate sensible URLs every segment of the mapping must be either a literal or bound to a named variable, so the generator can know what (possibly empty) value it should use to replace the wildcard.

如果您使用映射

If you were to use the mapping

"/categories/$action?/$id?/$path**?"

那么它仍然会在转发模式下匹配相同的URI（存储URI后的尾部） id in params.path ）但< g：link controller =categoryaction =showid =$ {category.id}> 将知道使用空的尾随组件，因为您没有指定 params =[path：'东西']。

then it would still match the same URIs in forward mode (storing the trailing portion of the URI after the id in params.path) but <g:link controller="category" action="show" id="${category.id}"> will know to use an empty trailing component because you didn't specify params="[path:'something']".

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