如何将此mongo查询转换为pymongo代码？

Question

I have wrote some mongo query. but I can't use this query in pymongo.

I tried to use "$lookup" but my mongo version is 3.4, and it doesn't support pipeline. So I wrote queries. But I have no idea to store query results to mongodb 'var' in python.

var user_ids = db.register.find({
        "$and": [
            {"_id": {"$gte": ObjectId("5d0a4df00000000000000000")}}
            ,{"_id": {"$lt": ObjectId("5d0b9f700000000000000000")}}
    ]}).map(function(register){
        return register.user_id;
        });

db.login.find({
        "$and": [
            {"_id": {"$gte": ObjectId("5d0b9f700000000000000000")}}
            ,{"_id": {"$lt": ObjectId("5d0cf0f00000000000000000")}}
            ,{"user_id": {"$in": user_ids}}
    ]});

I wanna convert those queries to python code(pymongo).

Answer 1

From W3Schools you can create queries like so

import pymongo

myclient = pymongo.MongoClient("mongodb://localhost:27017/")
mydb = myclient["mydatabase"]
mycol = mydb["customers"]

for x in mycol.find({},{ "_id": 0, "name": 1, "address": 1 }):
  print(x)

so in your case it would be along the lines of:

from bson.objectid import ObjectId

user_ids = db.register.find({},{
    "$and": [
        {"_id": {"$gte": ObjectId("5d0a4df00000000000000000")}}
        ,{"_id": {"$lt": ObjectId("5d0b9f700000000000000000")}}
]}).map(function(register){
    return register.user_id;
    });

db.login.find({}, $and": [
            {"_id": {"$gte": ObjectId("5d0b9f700000000000000000")}}
            ,{"_id": {"$lt": ObjectId("5d0cf0f00000000000000000")}}
            ,{"user_id": {"$in": user_ids}}
    ]}

You also do not need the var in python. As in python you do not need to declare the variable type.