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如何在mongodb集合中的某一个中的股票等于“可用”时计数和累计相同的大小值。如何在猫鼬中计数数组
所需的如下结果:
{_id :'S',count: 5 }, {_id :'M',count: 2 }, {_id :'L',count: 1 }
"price" : 123.8,
"gender" : "women",
"colour" : "blue",
"item" : [
{
"name" : "ICE DUO ANTHRACITE YELLOW SMALL (S)",
"size" : "S",
"stock" : "Available",
"_id" : ObjectId("59b2829e5acd8e2d14aa84cf")
},
{
"name" : "ICE DUO ANTHRACITE YELLOW SMALL (L)",
"size" : "L",
"stock" : "Available",
"_id" : ObjectId("59b2829e5acd8e2d14aa84ce")
},
{
"name" : "ICE DUO ANTHRACITE YELLOW SMALL (M)",
"size" : "M",
"stock" : "Available",
"_id" : ObjectId("59b2829e5acd8e2d14aa84cd")
}
],
我已经试过这个代码,但我没有得到我想要的结果。 –
那么执行它后你会得到什么? – Sachin
除此之外,我仍然想要匹配stock ='Available' –