mongodb用python插入2个集合相同_id

Question

就是有2个集合，
然后2个集合同时插入数据。
希望数据的_id是一样的。我插入的时候老是相差1。
想问怎么实现，谢谢了

Answer 1

Before inserting data, use _id = ObjectId() to generate the id and put it into two dicts, then perform the save action

Answer 2

The writing below shell is

var id = new ObjectId();
db.coll_1.insert({
    _id: id,
    ...    // 其他字段
})
db.coll_2.insert({
    _id: id,
    ...    // 其他字段
})

In short, just make a new oneObjectId by yourself.