# This is an auto-generated Django model module.
# You'll have to do the following manually to clean this up:
#   * Rearrange models' order
#   * Make sure each model has one field with primary_key=True
#   * Make sure each ForeignKey and OneToOneField has `on_delete` set to the desired behavior
#   * Remove `managed = False` lines if you wish to allow Django to create, modify, and delete the table
# Feel free to rename the models, but don't rename db_table values or field names.
from django.db import models
from django.utils import timezone


class DemoUsers(models.Model):
    user_id = models.AutoField(primary_key=True)
    user_name = models.CharField(unique=True, max_length=255)
    first_name = models.CharField(max_length=255, blank=True, null=True)
    last_name = models.CharField(max_length=255, blank=True, null=True)
    email = models.CharField(unique=True, max_length=255, blank=True, null=True)
    hashed_password = models.CharField(max_length=255)
    enabled_flag = models.BooleanField()
    effective_from = models.DateTimeField()
    effective_to = models.DateTimeField(blank=True, null=True)
    created_by = models.CharField(max_length=255)
    creation_date = models.DateTimeField()
    last_updated_by = models.CharField(max_length=255, blank=True, null=True)
    last_update_date = models.DateTimeField(blank=True, null=True)

    class Meta:
        managed = False
        db_table = 'demo_users'

    def __str__(self):
        return self.user_name

    def save(self, *args, **kwargs):
        # 检查对象是否存在数据库中，即判断是否有主键pk
        if self.pk:  # 对象已存在，表示是更新操作
            # 在这里执行你希望在更新时发生的自动赋值逻辑
            self.last_update_date = timezone.now()  # 你的自定义更新逻辑
        else:
            self.creation_date = timezone.now()
        super().save(*args, **kwargs)  # 调用父类的save方法完成保存