Django序列化

问题一

序列化的model中含choice字段信息存在的问题，status会显示数字而非状态相关的文本，通过在serializers.py文件中添加另一个status_display字段类显示状态文本，便可以解决该问题

from rest——framework import serializers
from .models import Sprint,Task

...
class TaskSerializer(serializers.ModelSerializer):
   status_display = serializers.SerializerMethodField()
   
   class Meta:
       model = Task
       fields = ("id","name","description","sprint","status","status_display","order","assignred","started","due","completed",)
       
   def get_status_display(self,obj):
       return obj.get_status_display()

status_display 是一个只读字段，返回序列化器中get_status_display中方法的值,该方法的语法格式为get + 下划线 + 字段名称组成，如上所示，get_status_display

问题二

序列化遇到的第二个问题是: assigned是一个指向User模型中的外键,这里显示的是用户的主键，然而我们的URL结构期望通过用户名来引用用户，我们在serializers中使用SlugRelatedField来解决这个问题

class TaskSerializer(serializers.ModelSerializer):
    assigned = serializers.SlugRelatedField(
        slug_field=User.USERNAME_FIELD, required=False, allow_null=true,
        queryset=user.objects.all()
    )
    status_display = serializers.SerializerMethodField()

    class Meta:
        model = Task
        fields = (
            "id", "name", "description", "sprint", "status", "status_display", "order", "assigned", "started", "due",
            "completed")

    def get_status_display(self, obj):
        return obj.get_status_display()