我有一个对象数组，其中包含文档中的日期字段，我想使用过滤器匹配数组中的对象元素，我有一个类似于下面的查询
from collections import OrderedDict
order_dic = list(OrderedDict(sorted(dic.items(), key=lambda x: x[1]['speed'], reverse=True)))
如果我实际上要使用db.getCollection('test').aggregate([
{
$match: {
key: "test_key"
}
},
{
$project: {
testArray: {
$filter: {
input: '$testArray',
as: 'item',
cond: {
$or: [
{
$lt: [
"$$item.date1",
ISODate("2018-05-06 00:00:00.000Z")
]
},
{
$lt: [
"$$item.date2",
ISODate("2018-06-08 00:00:00.000Z")
]
}
]
}
}
}
}
}
])
而不是$or，则在$cond运算符中使用$nor运算符会很好用，但是查询报告如下$or
$nor在Failed to execute script.
Error:
Assert: command failed: {
"ok" : 0,
"errmsg" : "Unrecognized expression '$nor'",
"code" : 168,
"codeName" : "InvalidPipelineOperator"
} : aggregate failed
_getErrorWithCode@src/mongo/shell/utils.js:25:13
doassert@src/mongo/shell/assert.js:16:14
assert.commandWorked@src/mongo/shell/assert.js:370:5
DBCollection.prototype.aggregate@src/mongo/shell/collection.js:1319:5
DBCollection.prototype.aggregate@:1:355
@(shell):1:1
Error: command failed: {
"ok" : 0,
"errmsg" : "Unrecognized expression '$nor'",
"code" : 168,
"codeName" : "InvalidPipelineOperator"
} : aggregate failed :
_getErrorWithCode@src/mongo/shell/utils.js:25:13
doassert@src/mongo/shell/assert.js:16:14
assert.commandWorked@src/mongo/shell/assert.js:370:5
DBCollection.prototype.aggregate@src/mongo/shell/collection.js:1319:5
DBCollection.prototype.aggregate@:1:355
@(shell):1:1
中使用的运算符是否有任何限制？