来自CLI的嵌套Mongo查询

Question

对于以下数据（取自MongoDB in Action），如何在Mongo Shell中查询addresses.street获取addresses.home任何文档（在我的情况下，这里只有1）{{1}等于“家”？

期望的结果：{"street" : "1 E. 23rd Street"}

{ _id: ObjectId("4c4b1476238d3b4dd5000001")
username: "kbanker",
addresses: [
{ 
  name: "home",
  street: "588 5th Street",
  city: "Brooklyn",
  state: "NY",
  zip: 11215},
{ 
  name: "work",
  street: "1 E. 23rd Street",
  city: "New York",
  state "NY",
  zip 10010},
]}

Answer 1

您必须在投影模式下使用$ elemMatch：DOCS

db.collection.find({},{addresses: {$elemMatch:{'name':'home'}}, 'addresses.street':1, _id:0})
{ "addresses" : [ { "street" : "588 5th Street" } ] }