Django之contenttype

Posted 2021-12-23 farion

from django.db import models
from django.contrib.contenttypes.fields import GenericForeignKey,GenericRelation
from django.contrib.contenttypes.models import ContentType

class Course(models.Model):
    """
    普通课程
    """
    title = models.CharField(max_length=32)

    # 仅用于反向查找
    price_policy_list = GenericRelation("PricePolicy")


class DegreeCourse(models.Model):
    """
    学位课程
    """
    title =models.CharField(max_length=32)

    # 仅用于反向查找
    price_policy_list = GenericRelation("PricePolicy")

class PricePolicy(models.Model):
    """
    价格策略
    """
    price = models.IntegerField()
    period = models.IntegerField()

    content_type = models.ForeignKey(ContentType, verbose_name="关联的表名称")
    object_id = models.IntegerField(verbose_name="关联的表中的数据行ID")
    content_obj = GenericForeignKey(‘content_type‘, ‘object_id‘)


#查找价格策略
course = Course.objects.filter(id=1).first()
price_policy = course.price_policy_list.all()

#快速插入数据
obj1 = Course.objects.filter(title=‘Python‘).first()
PricePolicy.objects.create(price=9.9, period=7, content_type=obj1)