{
"_id" : "000f7ef7-b4d2-4b3a-a33a-ce4f5a6dc594",
"ClientCode" : "67018",
"ClientName" : "test06",
"Addresses" : [
{
"AddressTypeCode" : "1",
"EmailAddress" : "[email protected]"
},
{
"AddressTypeCode" : "2",
"EmailAddress" : "[email protected]"
}
,
{
"AddressTypeCode" : "3",
"EmailAddress" : "[email protected]"
}
]
}
我想得到以下结果使用mongo投影与过滤条件的子阵列地址与AddressTypeCode等于1并获取电子邮件地址。
{ "ClientCode" : "67018", "ClientName" : "test06", "EmailAddress" :[email protected]"}
我会首先放松一下:
{ $unwind : "$Addresses" }
然后做一个匹配:
{ $match : { "Addresses.AddressTypeCode" : "1" } }
然后做投影:
{ $project : { "ClientCode" : 1, "ClientName" : 1, "EmailAddress" : "$Addresses.AddressTypeCode" } }