django之DRF --关联字段序列化

5. 父表获取从表所有信息 / 从表获取父表所有信息（自定义序列化器）

　　定义一个序列化器类，指定要返回的父表字段，然后将这个序列化器类作为子表Serializer中的字段即可；从表同理

子表Serializer中的字段：命名用子表模型中的外键名

父表Serializer中的字段：命名用related_name 或 从表模型类名小写_set

 

从表中返回父表字段

interfaces/serializers.py

from rest_framework import serializers
from projects.models import Projects

class OneProjectsSerializer(serializers.Serializer):
    """
    定义一个序列化器类，指定要返回的父表字段
    """
    id = serializers.IntegerField()
    name = serializers.CharField()
    leader = serializers.CharField()
    is_execute = serializers.BooleanField()
    desc = serializers.CharField()
    create_time =serializers.DateTimeField()
    update_time = serializers.DateTimeField()

class InterfacesSerializer(serializers.Serializer):
    id = serializers.IntegerField(label='id主键', help_text='id主键', required=False)
    name = serializers.CharField(label='接口名称', help_text='接口名称', max_length=15,
                                 error_messages={'max_length': 'name不能超过15字'})
    tester = serializers.CharField(label='测试人员', help_text='测试人员', max_length=10,
                                   error_messages={'max_length': 'tester不能超过15字'})
    create_time = serializers.DateTimeField(label='创建时间', help_text='创建时间', required=False, read_only=True)
    update_time = serializers.DateTimeField(label='更新时间', help_text='更新时间', required=False, read_only=True)
    # projects = serializers.StringRelatedField(label='所属项目名称', help_text='所属项目名称')
    # projects = serializers.PrimaryKeyRelatedField(queryset=Projects.objects.all(), label='项目id', help_text='项目id')
    projects = OneProjectsSerializer(label='获取父表projects所有信息',help_text='获取父表projects所有信息',read_only=True)



interfaces/models.py

from django.db import models

class Interfaces(models.Model):
    id = models.AutoField(primary_key=True, verbose_name='id主键', help_text='id主键')
    name = models.CharField(verbose_name='接口名称', help_text='接口名称', max_length=15, unique=True)
    tester = models.CharField(verbose_name='测试人员', help_text='测试人员', max_length=10)
    create_time = models.DateTimeField(auto_now_add=True, verbose_name='创建时间', help_text='创建时间')
    update_time = models.DateTimeField(auto_now=True, verbose_name='更新时间', help_text='更新时间')
    projects = models.ForeignKey('projects.Projects', on_delete=models.CASCADE, related_name='interfaces')