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如何说明一阵收集的阵列中是否存在一系列价值观?
原标题:How to tell if an array of values all present in an array in a mongodb collection?

I have some code that looks like this (all within the mongodb interpreter):

var needed_skills = [ mongodb , javascript , c++ , php ]

db.applicants.save( { name: joe , skills:[ c++ , ruby , css ] } );
db.applicants.save( { name: peter , skills:[ mongodb , javascript , c++ , php , html ] } );

我是如何问及申请人是否具备所有必要的技能的? 基本是一米,寻找所有阵列成员的文件。 我知道,如果你想找到一位成员的话,你会这样做。

db.applicants.find({skills: mongodb })

然而,这只是相互匹配的,正如我想要做到的......。

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最佳回答

您希望使用<代码>$all:

db.applicants.find({skills: {$all: [ mongodb , javascript , c++ , php , html ]} });

var needed_skills = [ mongodb , javascript , c++ , php ]

db.applicants.find({skills: {$all: needed_skills} }); 
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