将值传递给地图函数-CouchDB [英] Passing values to a map function - CouchDB

问题描述

我想知道是否有可能将值传递给bedDB设计文档中的map函数.

I was wondering whether its possible to pass values to a map function in couchDB design document.

例如:

在下面的代码中，可以传递用户输入的值，然后使用该值来运行map函数.也许我可以在用户登录时传递 UserName 用户，然后基于地图功能显示视图.

In the code below is it possible to pass a value that has been entered by the user and use that value to run the map function. Maybe I can pass users UserName when they login and then display the view based on the map function.

function(doc) {
   if(doc.name == data-Entered-By-User) {
   emit(doc.type, doc);
  }
}

先谢谢您. 问候

推荐答案

在使用视图时，这是CouchDB中的常见错误.有点令人困惑，但要代替它:

This is a common mistake in CouchDB when using views. It's kinda confusing, but instead of this:

function (doc) {
  if (doc.value === 'thing I am looking for') {
    emit(doc.value);
  }
}

您想要的是什么

function (doc) {
  emit(doc.value);
}

然后，当您查询时，您将执行以下操作:

And then when you query, you do:

/mydb/_design/myddoc/_view/myview?key="thing I am looking for"

您可能想阅读我的

You might want to read my 12 pro tips for better code with PouchDB, especially tip #9. The tips apply equally well to CouchDB. :)

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