CouchDb视图-键入列表 [英] CouchDb view - key in a list

问题描述

我想查询CouchDB，我有一个特殊的需求：我的查询应返回与此条件相对应的文档的名称字段：id等于或包含在归档的文档（列表）中。
例如，字段输出如下：

I Want to query CouchDB and I have a specific need : my query should return the name field of documents corresponding to this condition : the id is equal or contained in a document filed (a list). For example, the field output is the following :

"output": [
       "doc_s100",
       "doc_s101",
       "doc_s102",
       "doc_s103",
   ],

例如，我要获取其输出字段 doc_s102中包含的所有文档。
我在设计文档中写了一个视图：

I want to get all the documents having in their output field "doc_s102" for example. I wrote a view in a design document :

"backward_by_docid": {
           "map": "function(doc) {if(doc.output) emit(doc.output, doc.name)}"
       }

，但是仅当我在输出字段中具有唯一值时，此视图才有效。
如何解决该查询？

but this view works only when I have a unique value in the output field. How can I resolve this query ?

谢谢！

推荐答案

您必须遍历数组：

  if(doc.output) {
      for (var curOutput in doc.output) {
        emit (doc.output[curOutput],doc.name);
      }
  }

请确保输出始终为数组（至少[]）

make sure that output always is an array (at least [])

..，当然使用key = xx代替key = [ xxx]

.. and, of course use key="xx" instead key=["xxx"]

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