关于Django orm models文件定义函数的写法

Posted 2021-03-14 tangda

models.py

class Candidate(BaseModel):
    name = models.CharField(max_length=64,
                            verbose_name="候选人姓名",
                            null=True,
                            blank=True)
    email = models.EmailField(null=True,
                              blank=True,
                              verbose_name="候选人邮箱")
    code = models.CharField(max_length=48,
                            verbose_name="每张表数据对应的uuid",
                            null=True,
                            blank=True)
    expire_time = models.DateTimeField(null=True,
                                       verbose_name=‘过期时间‘)

    class Meta:
        verbose_name = "候选人表"
        verbose_name_plural = verbose_name

    def __str__(self):
        return self.name

class InvitationJobInterviewForm(BaseModel):
    invite_people = models.ForeignKey(to=‘Employees‘,
                                      verbose_name=‘邀请人‘,
                                      null=True,
                                      blank=True,
                                      related_name=‘invite_people_in_employees‘,
                                      on_delete=models.CASCADE)

    invited_people = models.ForeignKey(to=‘Candidate‘,
                                       verbose_name=‘被邀请人‘,
                                       null=True,
                                       blank=True,
                                       related_name=‘invited_people_in_candidate‘,
                                       on_delete=models.CASCADE)
    invite_people_code = models.CharField(max_length=64,
                                          verbose_name="邀请人code",
                                          null=True,
                                          blank=True)
    jobs = models.ForeignKey(to=‘Jobs‘,
                             verbose_name="招聘职位",
                             null=True,
                             blank=True,
                             on_delete=models.CASCADE,
                             related_name=‘invite_people_jobs‘)

    class Meta:
        verbose_name = ‘邀请职位面试表‘
        verbose_name_plural = verbose_name

    @property
    def get_invite_people_name(self):
        try:
            self.invite_people.name
        except Exception:
            return ‘null‘
        return self.invite_people.name

    @property
    def get_invited_people_name(self):
        try:
            self.invited_people.name
        except Exception:
            return ‘null‘
        return self.invited_people.name

    @property
    def get_job_name(self):
        try:
            self.jobs.jobname
        except Exception:
            return ‘null‘
        return self.jobs.jobname

    def __str__(self):
        return self.invite_people_code

以候选人表举例，

    def get_invited_people_name(self):
        try:
            self.invited_people.name
        except Exception:
            return ‘null‘
        return self.invited_people.name

self.invited_people 跨到外键关联的表中 self.invited_people.name跨到另外一张表中获取到name (这是正向查询)
如果外键在另一张表中，也可以直接点另外一张表中的外键，这样可以在本张表跨到关联的那张表，再点name 即可获得到另一张表里面的name(反向查询)