小编Fer*_*aub的帖子

我有一个"mongodb colllenctions",我想用它的键删除"空字符串".

由此:

{
    "_id" : ObjectId("56323d975134a77adac312c5"), 
    "year" : "15", 
    "year_comment" : "", 
}
{
    "_id" : ObjectId("56323d975134a77adac312c5"), 
    "year" : "", 
    "year_comment" : "asd", 
}

我想得到这个结果:

{
    "_id" : ObjectId("56323d975134a77adac312c5"), 
    "year" : "15", 
}
{
    "_id" : ObjectId("56323d975134a77adac312c5"), 
    "year_comment" : "asd", 
}

我该怎么解决？