在 CouchApp 视图中将参数传递给 map.js
我有一个 CouchApp，其功能类似于社交网络。我有一个“赞”按钮，当用户单击该按钮时，会创建并保存一个 CouchDB JSON 文档，其中包含字段 post_id（喜欢的帖子的 ID）、user_id（喜欢该帖子的用户的 ID），然后输入（值为“like”，表示该文档是相似的）。
除了这篇文章之外，我还想指出它收到的点赞数。我的地图函数如下所示：
function(doc) {
if (doc.type && doc.type == 'like') {
emit(doc.post_id, 1);
}
}
我的缩减函数如下：
function(post_ids, likes) {
return sum(likes);
}
我的问题是，该函数返回网站中所有帖子中所有点赞的总和。我认为我的reduce.js 很好，也许我可以调整我的map.js 以接受post_id 参数，这样我就可以只从该post_id 中检索喜欢的内容，但我该怎么做呢？ post_id当然来自设计文档，当点击“Like”按钮时。
谢谢。
I have a CouchApp that functions like a social network. I have a like button which, when clicked by a user, creates and saves a CouchDB JSON document with the fields post_id (the ID of the post that was liked), user_id (the ID of the user who liked the post), and type (value is "like," to indicate that the document is a like).
Alongside the post, I'd like to indicate the number of likes it has received. My map function looks like this:
function(doc) {
if (doc.type && doc.type == 'like') {
emit(doc.post_id, 1);
}
}
and my reduce, this:
function(post_ids, likes) {
return sum(likes);
}
My problem is, this function returns the sum of ALL the likes in ALL posts in the site. I'm thinking that my reduce.js is fine and that maybe I could tweak my map.js to accept a post_id argument so I can retrieve only the likes from that post_id, but how do I do that? The post_id comes from the design document, of course, when the "Like" button is clicked.
Thanks.
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您需要查看
group视图参数。如果您不提供查询字符串参数，则默认情况下会减少视图的全部内容。应用group=true后，您还可以使用key或startkey/endkey来选择您需要的帖子ID。此外，还有内置reduce函数可以更有效地执行基本的reduce操作。 （因为它们是编译的 erlang 代码，而不是 javascript 源代码）只需将
_count代替整个reduce.js即可。 （您甚至可以在emit中省略1）You need to look into the
groupview parameter. If you supply no querystring parameters, the default is to reduce the entire contents of the view. Once you applygroup=true, you can also usekeyorstartkey/endkeyto pick out the post id(s) you need.Also, there are built-in reduce functions that can perform basic reduce operations much more efficiently. (since they are compiled erlang code, not javascript source) Just put
_countin place of your entirereduce.js. (You can even leave off the1in youremit)