Vue + Django 2.0.6 学习笔记 8.3 用户收藏接口实现

野性酷女 2022-01-14 12:27 249阅读 0赞

用户收藏属于用户的操作行为 所以放到user\_operation中

# views.py
    
    from rest_framework import viewsets
    from rest_framework import  mixins
    
    from .models import UserFav
    from .serializers import UserFavSerializer
    # Create your views here.
    
    # 创建mixin, 展示mixin, 删除mixin
    class UserFavViewset(mixins.CreateModelMixin, mixins.ListModelMixin, mixins.DestroyModelMixin, viewsets.GenericViewSet):
        """
        用户收藏功能
        """
        queryset = UserFav.objects.all()
        serializer_class = UserFavSerializer

然后写UserFavSerializer

# encoding:utf-8
    
    from rest_framework import serializers
    用于唯一联合过滤用
    from rest_framework.validators import UniqueTogetherValidator
    
    from user_operation.models import UserFav
    
    class UserFavSerializer(serializers.ModelSerializer):
    
    # 这里的user字段的作用是某人返回当前用户的收藏信息。 如果不加该句的话 默认是会返回左右用户的收藏信息
        user = serializers.HiddenField(
            default=serializers.CurrentUserDefault()
            )
        class Meta:
            model = UserFav
    # 该字段是用于防止用户重复收藏同一个字段，如果不加这个。 用户可以反复收藏同一个字段。 
    # 这是通过Serializer来拦截。 还是可以通过model来拦截（数据库表做联合唯一）
            # 联合唯一 必须要写在Meta 因为它作用于多个字段 而不是单独的某个字段
            # 如果是作用域某个字段之上，那就写到上面去
            validators = [
                UniqueTogetherValidator(
                    queryset=UserFav.objects.all(),
                    fields=('user', 'goods'),
                # 自定义错误消息
                    message='已经收藏'
                )
            ]
            fields = ('user', 'goods', 'id')

model的联合唯一

class UserFav(models.Model):
        """
        用户收藏
        """
        user = models.ForeignKey(User, verbose_name=u'用户', on_delete=models.CASCADE)
        goods = models.ForeignKey(Goods, verbose_name=u'商品', on_delete=models.CASCADE)
        add_time = models.DateTimeField(default=datetime.now, verbose_name=u'添加时间')
    
        class Meta:
            verbose_name = u'用户收藏'
            verbose_name_plural = verbose_name
    # 这里 但是我个人不介意这么干  这样数据库的表就不灵活了
            unique_together = ("user", "goods")
    
        def __str__(self):
            return self.user.name

关于返回当前用户的收藏信息的文档说明

[https://www.django-rest-framework.org/api-guide/validators/\#advanced-field-defaults][https_www.django-rest-framework.org_api-guide_validators_advanced-field-defaults]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NvdWx3eWI_size_16_color_FFFFFF_t_70][]

联合唯一查询的文档说明：

[https://www.django-rest-framework.org/api-guide/validators/\#uniquetogethervalidator][https_www.django-rest-framework.org_api-guide_validators_uniquetogethervalidator]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NvdWx3eWI_size_16_color_FFFFFF_t_70 1][]

示例

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NvdWx3eWI_size_16_color_FFFFFF_t_70 2][]

urls.py:

from user_operation.views import UserFavViewset
    
    router.register(r'userfavs', UserFavViewset, base_name='userfavs')

完结

[https_www.django-rest-framework.org_api-guide_validators_advanced-field-defaults]: https://www.django-rest-framework.org/api-guide/validators/#advanced-field-defaults
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NvdWx3eWI_size_16_color_FFFFFF_t_70]: /images/20220114/cfa8b365359e4352a4d94d7206a40a71.png
[https_www.django-rest-framework.org_api-guide_validators_uniquetogethervalidator]: https://www.django-rest-framework.org/api-guide/validators/#uniquetogethervalidator
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NvdWx3eWI_size_16_color_FFFFFF_t_70 1]: /images/20220114/3013284f7978459ea26ad4bab654845c.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NvdWx3eWI_size_16_color_FFFFFF_t_70 2]: /images/20220114/bf984f6517aa42d68403ee895b45bed9.png