删除Lithium/Freemarker中的重复项

Question

我正在使用Lithium自定义组件来创建写过最多博客文章的用户列表。我有一个用户列表，这些用户写了一篇博客文章，然后进行了rest调用，以获取每个用户写的博客文章的数量。

<#assign authors = rest("blogs/id/audiofile/posts")>

<#list authors.node_message_context.message.author as t>
<#assign count = rest("${t.@href}/posts/style/blog/count")>
<#assign orderedCount = count.value>
<#list orderedCount as c>
<ul>
<li>Blog posts ${c} userid ${t.@href}
</ul>
</#list>
</#list>

给出一个输出

Blog posts 4 userid /users/id/2477

Blog posts 4 userid /users/id/2477

Blog posts 4 userid /users/id/2477

我的问题是如何删除此列表中的重复作者？

Answer 1

@Wolfgang希望我们可以修改Lithium REST API =)！

不幸的是，情况并非如此，所以我们必须处理我们得到的东西，这可能是这样做的：

<#-- this variable we need to store unique author ids -->
<#assign authorids = [] />
<#-- I'd use API v2 here, think for such stuff it's more powerful than v1 -->
<#assign query = 'SELECT author FROM messages WHERE conversation.style = "blog" AND board.id = "audiofiles"'?url />
<#assign response = rest("2.0", "/search?q=" + query) />

<#-- the response object will contain a list of blog post authors,
     we loop trough them to get uniqe ids of every user that has written
     a blog post, we need them later -->
<#list response.data.items as author>
    <#-- make sure each author just gets added once -->
    <#if !authorids?seq_contains(author.id)>
        <#assign authorids = authorids + [author.id] />
    </#if>
</#list>

<#-- now we loop trough the unique author ids and ask for the amount of
     blog posts they have written -->
<ul>
<#list authorids as id>
    <#assign query = 'SELECT count(*) FROM messages WHERE author.id = id AND board.id = "audiofiles"'?url />
    <#assign response = rest("2.0", "/search?q=" + query) />

    <li>User with ID ${id} has written ${response.data.count} blog posts</li>
</#list>
</ul>

代码是未经测试的，所以不能百分之百确定它是否可以工作，但我希望我选择的方法通过上面的代码变得清晰……

Answer 2

常见问题解答文章http://freemarker.org/docs/app_faq.html#faq_modify_seq_and_map概述了为什么这是棘手的。基本上，它需要修改您的restful接口来为您完成这项工作：

<#assign authors = rest("blogs/id/audiofile/uniquauthors")>

将是一个新的restful接口的示例，然后在服务器端完成工作。