通过 Mongoengine 集成 Python 和 MongoDB

Question

我正在学习如何整合 Python 和 MongoDB，所以我给自己设定了一个挑战：创建一个注册足球运动员的小程序。

我的程序有两个模块，info_player 和 info_team。我将以交互方式运行程序 (python -i)。第一个模块接收有关球员的信息，第二个模块接收有关球队的信息，以及一些查询和保存在数据库中。

我的数据库设计如下，数据库名为 "championship"，集合为 "teams"，文档为 "players"。也就是说，球队和球员之间是一对多的关系。

我的问题：我是否需要将对象转换为 Json（认为 to_json 方法）？如何保存和查询？

info_player:

class Player:
    def __init__(self, name, age, nationality="brazilian", team):
        """
        initializating Jogador class
        """
        self.personal(name, age, country)
        self.professional(team)

    def personal(self, name, age, nationality, dominancy, height):
        """
        personal data about players
        """
        self.name = name
        self.age = age
        self.nationality = nationality
        self.height = height
        self.dominancy = dominancy  # righty, lefty or ambidextrous

    def profissional(self, position, number, team, primary):
        """ 
        professional data about players
        """
        self.position = position
        self.number = number
        self.team = team
        self.primary = False  # is he a regular member of a team?

    def to_Json():
        pass

info_team:

from pymongo import MongoClient
from info_player import Player


class TeamDB:
    def __init___(self, nome, fundacao, federacao):
        self.name = name
        self.foundationData = foundationData
        self.federation = federation

    def initializeDB():
        client = MongoClient('localhost', 27017)
        global base
        base = client.league

    def toMongo():
        """
        receive a player object and save it 
        """
    def playersByPosition():
        """
        query players by position
        """
    def lineup():
        """
        receive a team and return its starting line-up, players with primary = true
        """

Answer 1

do I need to convert objects to Json (thought to_json method)?

不，你不必这样做。在你保存文档的问题的上下文中，你可以调用 .save() 这是因为底层 MongoEngine 将对象转换为 BSON，这样你就不必显式编写方法将其转换为 JSON.

参见 MongoEngine：将 mongoengine 对象转换为 JSON#1 如果您想了解如何将 MongoEngine 对象转换为 JSON。

How to save and make some queries?

查看插入示例 MongoEngine Tutorial: Adding to our tumblelog：

p1 = Player(name='Caio', age=20)
p1.save()

或查询：Retrieving Type Specific Information。

通过 Mongoengine 集成 Python 和 MongoDB

Integrating Python and MongoDB through Mongoengine

python

mongodb

mongoengine

python-3.x