多对多查询的 Django 模型文件更新

Posted 2023-02-24

【中文标题】多对多查询的 Django 模型文件更新

【英文标题】：Django models file update for many to many query

【发布时间】：2021-04-12 11:45:12

【问题描述】：

所有， 这是我的困境。我创建了 Django models.py 文件，其中包含 2 个类，CustTeamMembers 和 CustTeamName。两者之间存在多对多关系，称为 cust_members。这意味着一个团队成员可以在多个团队中，并且多个团队可以拥有同一个成员。

我需要创建一种方法，为每个团队选择一名成员作为团队领导。该团队成员需要来自 cust_members 列表。

到目前为止，我还没有运气。任何帮助将不胜感激。

我的 models.py 文件：

from django.db import models

# This will hold the team members
class CustTeamMembers(models.Model):
    member_first_name = models.CharField(max_length = 100)
    member_last_name  = models.CharField(max_length = 100)
    member_email      = models.EmailField(unique=True)
    member_phone      = models.CharField(max_length = 25, blank=True)

    class Meta(object):
        ordering = ['member_last_name']

    def __str__(self):
        return self.member_first_name + ' ' + self.member_last_name

# This will hold the customer name
class CustTeamName(models.Model):
    cust_name    = models.CharField(max_length = 100)
    #cust_lead    = models.ForeignKey(CustTeamMembers, on_delete=models.CASCADE, blank=True)
    cust_members = models.ManyToManyField(CustTeamMembers, blank=True)
    cust_meet    = models.CharField(max_length = 40, blank=True)
    cust_status  = models.TextField(blank=True)

    def __str__(self):
        return self.cust_name

    def get_members(self):
        return ", ".join([str(p) for p in self.cust_members.all()]

~埃德

【参考方案1】：

我会建议使用through 并自定义中间表。像这样。

from django.db import models

# This will hold the team members
class CustTeamMembers(models.Model):
    member_first_name = models.CharField(max_length = 100)
    member_last_name  = models.CharField(max_length = 100)
    member_email      = models.EmailField(unique=True)
    member_phone      = models.CharField(max_length = 25, blank=True)

    class Meta(object):
        ordering = ['member_last_name']

    def __str__(self):
        return self.member_first_name + ' ' + self.member_last_name

# This will hold the customer name
class CustTeamName(models.Model):
    cust_name    = models.CharField(max_length = 100)
    #cust_lead    = models.ForeignKey(CustTeamMembers, on_delete=models.CASCADE, blank=True)
    cust_members = models.ManyToManyField(CustTeamMembers, blank=True, through="TeamsAndMembers")
    cust_meet    = models.CharField(max_length = 40, blank=True)
    cust_status  = models.TextField(blank=True)

    def __str__(self):
        return self.cust_name

    def get_members(self):
        return ", ".join([str(p) for p in self.cust_members.all()]

class TeamsAndMembers(models.Model):
    team = models.ForeignKey(CustTeamName, on_delete=models.CASCADE)
    member = models.ForeignKey(CustTeamMembers, on_delete=models.CASCADE)
    is_leader = models.BooleanField(default=False)