django model IntegerField字段约束

from django.db import models
from django.core.validators import MaxValueValidator, MinValueValidator

class JenkinsServices(models.Model):
    project_id = models.IntegerField(default=1,
                                     validators=[MaxValueValidator(1000), MinValueValidator(1)])
    service_name = models.CharField(max_length=100, null=False)
    service_description = models.TextField(max_length=200, null=True)

    class Meta:
        db_table = "tbl_jenkins_services"
        verbose_name = ‘jenkins服务信息表‘
        ordering = ["id"]

class JenkinsServiceSerializer(serializers.ModelSerializer):
    project_id = serializers.IntegerField(required=True, max_value=1000, min_value=1)
    service_name = serializers.CharField(max_length=100, required=True)
    service_description = serializers.CharField(max_length=200,
                                                allow_null=True, allow_blank=True)

    class Meta:
        model = models.JenkinsServices
        fields = "__all__"

class ProjectInformation(BaseModel):
    id = models.AutoField(primary_key=True)
    project_name = models.CharField(max_length=50, null=False, unique=True)
    tester_charge = models.CharField(max_length=100, null=False)
    product_manager = models.CharField(max_length=100, null=False)
    project_description = models.TextField(max_length=200, null=True)

MinLengthValidator,MaxLengthValidator