• models：比如有以下三个模型

  from django.db import models

  """
  基类，其他类继承即可获得对应的字段
  """
  class BaseModel(models.Model):
  updated_tm = models.DateTimeField(auto_now=True)
  created_tm = models.DateTimeField(auto_now_add=True)

  class Meta:
      abstract = True

  """
  项目列表
  """
  class ProjectList( BaseModel):
  project_id = models.AutoField(help_text="项目ID", primary_key=True)
  project_name = models.SlugField(max_length=128, help_text="项目名称", unique=True)

  class Meta:
      db_table = 'project_list'
      verbose_name = '项目列表信息'
      verbose_name_plural = verbose_name

  """
  项目详情
  """
  class ProjectDetail(BaseModel):
  project_introduction = models.CharField(max_length=128, help_text="用户简介")
  project_info = models.ForeignKey(to=ProjectList, on_delete=models.DO_NOTHING, db_constraint=False, related_name='user')

  class Meta:
      db_table = project_detail'
      verbose_name = '项目详情信息'
      verbose_name_plural = verbose_name

一、同时新增数据到两个数据库表

• views

  from rest_framework import filters, mixins, generics
  from rest_framework.viewsets import GenericViewSet

  class ProjectListView(mixins.CreateModelMixin, GenericViewSet):
  queryset = Account.objects.filter(is_delete=0).all().order_by("-created_tm")

  def create(self, request, *args, **kwargs):
  # 先定义两个dict
  project_list_dict = {}
  project_detail_dict = {}

  # 使用 ._meta.get_fields() 获取数据库表的全部字段，再使用field.name获取全部的字段名称，放入各自的dict，不存在的自动忽略掉
  for item in request.data.items():
      if item in [field.name for field in ProjectList._meta.get_fields()]:
          project_list_dict [item[0]] = item[1]
      elif item in [field.name for field in ProjectDetail._meta.get_fields()]:
          project_detail_dict [item[0]] = item[1]
  
  # 从上面的models可以看到，项目详情与项目列表两张表是有关联的，所以，新增数据的时候，先现在列表，新增成功，生成ID后，再新增详情，并通过ID与列表数据关联起来
  # 检查项目是否存在，项目名称唯一约束，Serializer内设置必填
      try:
          # 存在就直接失败
          ProjectList.objects.get(project_name=request.data.get('project_ame'))
          return xxx
      except Account.DoesNotExist:
          # 如果不存在，先调用ProjectList表新增数据
          try:
              project_create = ProjectList.objects.update_or_create(defaults=project_list_dict, project_name=project_list_dict["project_ame"])
              # 如果ProjectList表新增数据成功，则通过project_info，在ProjectDetail新增对应的数据
              if project_create:
                  project_id = ProjectList.objects.filter(project_name=project_list_dict["project_ame"]).values('project_id').first()
                  ProjectDetail.objects.update_or_create(defaults=project_detail_dict, project_info=project_id["project_id"])
                  return xxx
          except Exception as e:
              return e

二、同时返回两个表的数据(插拔式)

• 插拔式的好处：即插即用，需要时才调用，不需要则不调用

• 从ProjectDetail这个models我们可以看到，是没有定义project_id和project_name的，但我们是与ProjectList关联的，所以，我们可以通过project_info，返回ProjectList已定义的project_id和project_name

  我们只需要把ProjectDetail改成以下这样子就可以了

  class ProjectDetail(BaseModel):
  project_introduction = models.CharField(max_length=128, help_text="用户简介")
  project_info = models.ForeignKey(to=ProjectList, on_delete=models.DO_NOTHING, db_constraint=False, related_name='user')

  class Meta:
      db_table = project_detail'
      verbose_name = '项目详情信息'
      verbose_name_plural = verbose_name
  
  @property
  def  project_id(self):
      return self.project_info.project_id
  
  @property
  def  project_name(self):
      return self.project_info.project_name

  然后在序列化器内直接调用project_id和project_name即可

  class ProjectDetailSerializer(serializers.ModelSerializer):
  class Meta:
  model = ProjectDetail

      fields = ('project_id', 'project_name', 'project_introduction',)