python mongoenqine 查询文档

Question

我正在从 mongodb 查询 2 个集合。我正在查询一个包含名为 'quiz_id' 的字段的集合。我想搜索此字段的值（例如第一个 quiz_id 值是 'M7001'）。在第二个集合中，我想从第一个查询中搜索 'quiz_id' 的值（这是从 0 到 10 的测验的分数），这是一个键和 return 值。这是我拥有的：

quizzes = Topic_maths.objects.order_by('quiz_id')
quiz_chk = User.objects.filter(username=current_user)

for quiz_id in quizzes:
    print (quiz_id.quiz_id)
    key = quiz_id.quiz_id
    if key in quiz_chk:
        print ("score: ", key.quiz_id)
    else:
        print ("no score")

所以第一部分 'print (quiz_id.quiz_id)' 打印每个测验编号 ok。但我不知道如何在 mongo 查询集 returned 中搜索密钥。咨询：

print (quiz_id.quiz_id)
<class 'flask_mongoengine.BaseQuerySet'>

任何帮助将不胜感激，谢谢

Answer 1

quiz_chk 需要额外的迭代：

[q['quiz_id'] for q in quiz_chk]

这将使整个代码看起来像这样：

from mongoengine import *

connect('test')


class TopicMaths(Document):
    quiz_id = StringField()


class User(Document):
    username = StringField()
    quiz_id = StringField()


current_user = 'Bob'

quizzes = TopicMaths.objects.order_by('quiz_id')
quiz_chk = User.objects.filter(username=current_user)

for quiz_id in quizzes:
    print(quiz_id.quiz_id)
    key = quiz_id.quiz_id
    if key in [q['quiz_id'] for q in quiz_chk]:
        print("score: ", key)
    else:
        print("no score")

输出：

M7001
no score
M7002
score:  M7002
M7003
no score

python mongoenqine 查询文档

python mongoenqine querying documents

python

mongoengine

flask-mongoengine