django.core.exceptions.FieldError：无法将关键字“department_name”解析为字段

Question

如何正确使用serializers.SlugRelatedField？
我的代码看起来像这样，但出现错误...
有完整的错误：
django.core.exceptions.FieldError：无法将关键字“department_name”解析为字段。选项包括：徽章、created_at、department、department_id、gender、id、name、position、position_id、updated_at

型号代码：

class Employee(models.Model):
    GENDER_CHOICES = (
        ('Male', 'Male'),
        ('Female', 'Female'),
    )
    name = models.CharField(max_length=100)
    badge = models.CharField(max_length=6, unique=True)
    gender = models.CharField(max_length=20, choices=GENDER_CHOICES)
    department = models.ForeignKey(
        Department, on_delete=models.CASCADE, null=True)
    position = models.ForeignKey(
        Position, on_delete=models.CASCADE, null=True)
    updated_at = models.DateTimeField(auto_now=True)
    created_at = models.DateTimeField(auto_now_add=True)

    def __str__(self):
        return f'{self.name} - {self.badge}'

序列化器代码

from rest_framework import serializers
from .models import Employee


class EmployeeSerializer(serializers.ModelSerializer):
    department = serializers.SlugRelatedField(
        slug_field='department_name', queryset=Employee.objects.all())
    # position = serializers.SlugRelatedField(
    #     slug_field='position_name', queryset=Employee.objects.all()

    class Meta:
        model = Employee
        fields = '__all__'

Answer 1

在您的序列化器代码中，执行以下操作

slug_field='department', queryset=Employee.objects.all())

这是因为你的“Employee”模型类中没有任何名为“department_name”的字段。

Answer 2

您确定 SlugFiled 是最佳选择吗？

要获取部门名称，您可以使用：

department = serializers.CharField(source="department.department_name")

但是你的部门 FK 可以为空，这会更好：

class EmployeeSerializer(serializers.ModelSerializer):
    department = serializers.SerializerMethodField()

    class Meta:
        model = Employee
        fields = '__all__'

    @staticmethod
    def get_department(obj):
        return obj.department.department_name if obj.department else None