Mongodb 替换流星集合中阵列中的对象
我有一个名为Tiers的集合,该集合具有以下架构:Mongodb 替换流星集合中阵列中的对象,mongodb,meteor,Mongodb,Meteor,我有一个名为Tiers的集合,该集合具有以下架构: { "_id" : "u7fF2gjig3AXsnYBb", "prizes" : [ { "_id" : "8h5b4QCd4fj7n7yek", "pos" : 1, "prize" : "prize 0" }, { "_id" : "ZXK5is9ExpdAJJqJ5", "pos" : 2, "prize" : "prize 1"
{
"_id" : "u7fF2gjig3AXsnYBb",
"prizes" : [
{
"_id" : "8h5b4QCd4fj7n7yek",
"pos" : 1,
"prize" : "prize 0"
},
{
"_id" : "ZXK5is9ExpdAJJqJ5",
"pos" : 2,
"prize" : "prize 1"
},
{
"_id" : "eWdbxQJ5oaM2xnX8v",
"pos" : 4,
"prize" : "prize 2"
}
]
}
如何用pos字段替换奖品数组中的对象
我正在尝试这样做:
var pos = 4;
var newPrize = {_id: Random.id(), pos: pos, prize: prize};
Tiers.update({_id: tierId}, {
$pull: {prizes: {pos: pos}},
$push: {prizes: newPrize}
});
但是我得到了一个例外:
MongoError:fieldname不允许使用修饰符重复
这可能是您的答案
db.test.update(
{
_id : tierId,
'prizes.pos': 1
},
{
$set : {'prizes.$': newPrize}
}
)