查找文档阵列的CouchDB

问题描述

我的文档他们有这样的结构：

I have Documents they have this structure:

{id: ####,
rev: ####,
"Cam_name": "Camera SX",
"colour": "white",
"manufacturer": "Sony",
"rec_limit": 180,
"Customer": ["Mike","Ann","James"]
}

{id: ####,
rev: ####,
"Cam_name": "PXSV CAM",
"colour": "white",
"manufacturer": "LG",
"rec_limit": 144,
"Customer": ["Mike","Oliver","Mr. Rain"]
}

{id: ####,
rev: ####,
"Cam_name": "LxSV Double",
"colour": "white",
"manufacturer": "Phillips",
"rec_limit": 160,
"Customer": ["Mike"]
}

和我想打一个地图功能查询，在那里我可以看到哪些客户麦克使用所有Cam_Names。

And i want to make an MAP Function query where i can see ALL Cam_Names which the Customer Mike is using.

我有一个呈三角地图显示功能，但这仅显示Cam_Name LxSV双，只有客户迈克。我想显示哪些迈克是使用所有Cam_Names。

i have a simillar Map Function but this shows only the Cam_Name LxSV Double and only the Customer Mike. i want to show all Cam_Names which mike is using.

更改为MyQuery：

MyQuery:

function(doc){
if(doc.Customer == "Mike"){
emit(doc.Cam_name, doc.Customer)

该查询给了我不正确的结果。

This query gives me not the right result.

推荐答案

如果您的查询看起来的究竟的那样，那么你有一个语法错误。但同时， doc.Customer 是一个数组，所以你不能做一个简单的平等检查。

If your query looks exactly like that, then you have a syntax error. But also, doc.Customer is an array, so you can't do a simple equality check.

但检查值的存在，在一个阵列是完全不必要的，你的地图功能可以简单地是这样的：

But checking the existence of a value in an array is totally unnecessary, your map function can simply look like this:

function (doc) {
  doc.Customer.forEach(function (customer) {
    emit(customer, doc.Cam_name);
  });
}

然后，查询与 / {DB} / _设计/ {ddoc} / _视图/ {查看}您的看法呢？关键=迈克

您输出如下：

{
  "total_rows": 3,
  "offset": 0,
  "rows": [
    {
      "id": "####",
      "key": "Mike",
      "value": "Camera SX"
    },
    {
      "id": "####",
      "key": "Mike",
      "value": "PXSV CAM"
    },
    {
      "id": "####",
      "key": "Mike",
      "value": "LxSV Double"
    }
  ]
}

现在，您可以使用相同的视角以寻找任何客户，不只是你在你的地图功能指定的任何人。

Now, you can use this same view to find any customer, not just whomever you specify in your map function.

这篇关于查找文档阵列的CouchDB的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！