如何在Django模型中制作独特的？并在Django中索引一列

from django.db import models

class MyModel(models.Model):
    my_field = models.CharField(max_length=100, unique=True)

from django.db import models

class MyModel(models.Model):
    my_field = models.CharField(max_length=100, unique=True, db_index=True)

from django.db import models

class MyModel(models.Model):
    my_field = models.CharField(max_length=100, unique=True)
    another_field = models.IntegerField()

    class Meta:
        indexes = [
            models.Index(fields=['my_field', 'another_field']),
        ]