python - Django 休息框架 : Order by Serializer Method Field

Question

我目前正在使用 Django REST framework 3.11.0 和 Django 3.0.6。我对 DRF 还是很陌生，我不确定如何解决这个问题。我正在尝试将排序应用于 SerializerMethodField 和枚举。我找到了一些 documentation这表明我可以制作自己的 OrderFilter，但我不知道如何制作。有没有我可以使用的例子？这是我的代码。

查看

from rest_framework import generics
from V1.assets.models.asset_main import Asset
from V1.assets.serializers.asset_serializer import AssetSerializer
from rest_framework import filters
from django_filters.rest_framework import DjangoFilterBackend

class AssetsView(generics.ListCreateAPIView):
    queryset = Asset.objects.all()
    serializer_class = AssetSerializer
    filter_backends = [DjangoFilterBackend, filters.SearchFilter, filters.OrderingFilter]
    filter_fields = ['asset_type']
    search_fields = ['asset_type', 'asset_properties', 'current_employee_name'] 

模型

class AssetType(models.TextChoices):
    LAPTOP = 'LPT', _('Laptop')
    MOUSE = 'MSE', _('Mouse')
    MONITOR = 'MTR', _('Monitor')
    AC_ADAPTER = 'ADR', _('AC Adapter')
    TELEPHONE = 'TLP', _('Telephone')
    LOCK = 'LCK', _('Lock')
    HEADSET = 'HDS', _('Headset')

class Asset(CreatedModified):

    asset_type = models.CharField(
        max_length=3,
        choices=AssetType.choices,
        default=None
    )
    asset_properties = JSONField(default=dict)
    current_employee = models.ForeignKey(
        Employee,
        related_name='assets_current_employees', 
        related_query_name='assets_current_employee',
        default=None,
        on_delete=models.CASCADE,
        null=True,
        blank=True
    )

    class Meta:
        app_label = 'assets'
        default_related_name = 'assets'

    def __str__(self):
        return self.asset_type

序列化器

from V1.general.enums import AssetStatus, AssetType
from V1.accounts.models.employee_main import Employee

class AssetSerializer(serializers.ModelSerializer):

    current_employee_name = serializers.SerializerMethodField('get_full_name_from_employee')
    asset_type = serializers.CharField(source='get_asset_type_display')

    class Meta:
        model = Asset
        fields = (
            'id',
            'asset_type',
            'asset_properties',
            'current_employee',
            'current_employee_name'
        )
        extra_kwargs = {
            'asset_type': {
                'required': True, 
                'allow_blank': False
            }
        }

    def get_full_name_from_employee(self, asset):
        current_employee_name = asset.current_employee.first_name + ' ' + asset.current_employee.last_name
        return current_employee_name

我似乎无法按 current_employee_name 或 asset_type 进行订购。我应该怎么做才能允许对这两个字段进行排序？

Answer 1

据我从您的问题中了解到，您想按当前员工姓名订购 Assets 。让我们以几个名字为例:

• Jean d'Artagnan(名字:Jean，姓氏:d'Artagnan)
• Joe 水管工(名字:Joe，姓:水管工)
• 乔纳斯迈耶(名字:乔纳斯，姓氏:迈耶)

如果我们先按 first_name 排序，然后按 last_name 排序，则可以实现相同的顺序。如果有多个条目具有相同的 first_name，则将按 last_name 进行排序。

要实现这一点，您只需在 View 中指定 ordering_fields:

class AssetsView(generics.ListCreateAPIView):
    filters = [filters.OrderingFilter]
    ordering_fields = ['current_employee.first_name', 'current_employee.last_name']