python - Django休息框架: get all data in relation

Question

所以，我有一个 Django 应用程序，我尝试获取 JSON 格式或 QuerySet 格式的所有信息:

models.py

class Flow(models.Model):
    name = models.CharField("nom", primary_key=True, max_length=255)
    BL_applicative = models.CharField("BL applicative", max_length=255,blank=True, null=True)
    comment = models.TextField("commentaire", max_length=1500,blank=True,null=True)
    application = models.ForeignKey('Application', null=True)

class Development(models.Model):
    stability = models.IntegerField("stabilité", default=0)
    unit_test = models.IntegerField("tests unitaires", default=0)
    documentation = models.IntegerField(default=0)
    conception = models.IntegerField(default=0)
    production = models.IntegerField("réalisation", default=0)
    flow = models.ForeignKey('Flow',blank=True,null=True)

class Segment(models.Model):
    index_number = models.IntegerField("indice")
    chain_batch_fueled = models.CharField(max_length=255, blank=True,null=True)
    comment = models.TextField("commentaire", max_length=1500, blank=True,null=True)
    development = models.ForeignKey('Development',verbose_name="Développement", blank=True,null=True)

在独立脚本中，我想获取所有数据，所以我使用了:

seg_ser = serializers.serialize('json', Segment.objects.all())

这就是结果:

[
  {
    "model": "dashboard_tibco.segment",
    "pk": 3,
    "fields": {
      "index_number": 1,
      "chain_batch_fueled": "",
      "comment": "",
      "development": 10
   }
  },
]

可以看到，这里只有数据的信息，没有开发、流程、应用的信息...

有什么解决方案可以获取开发对象的所有字段以及流程对象和应用程序对象的相同字段吗？

解决方案: 感谢杰米的帮助!

所以，这是我的serializers.py:

from rest_framework import serializers

from dashboard_tibco.models import Development, Segment


class DevelopmentSerializer(serializers.ModelSerializer):
    class Meta:
        model = Development
        fields = '__all__'


class SegmentSerializer(serializers.ModelSerializer):
    development = DevelopmentSerializer(read_only=True)

    class Meta:
        many = True
        model = Segment
        fields = '__all__'

我的view.py:

from django.http import HttpResponse
from dashboard_tibco.transformation_document.document import Document
def get_json_doc(request):
    return HttpResponse(Document().get_sql_data_by_application('GRS'))

我的urls.py:

from django.conf.urls import url
from django.contrib import admin


from dashboard_tibco.views import get_json_doc

urlpatterns = [
    url(r'^admin/', admin.site.urls),
    url(r'^json', get_json_doc, name='json'),
]

我的独立脚本与 django Rest 序列化器:

class Document(object):
    def __init__(self):
        /..Make something../

    def get_sql_data_by_application(self):
        serializer = SegmentSerializer(Segment.objects.all(), many=True)
        return JSONRenderer().render(serializer.data)

以及JSONRenderer的结果:

[
  {
    "id": 3,
    "development": {
        "id": 10,
        "status": "En cours",
        "stability": 0,
        "unit_test": 0,
        "documentation": 0,
        "conception": 0,
        "production": 0,
        "modification_date": null,
        "flow": "Batch",
        "achievement_lot": null,
        "project": null
     },
     "name": "",
     "index_number": 1,
     "pivot_subscribed": "",
     "pivot_published": "",
     "chain_batch_fueled": "",
     "comment": "",
     "called": null,
     "caller": null,
     "tuxedo_adapter": null
  },
]

Answer 1

我假设您使用的是 Django Rest Framework。

您需要创建一个自定义序列化器。我没有测试过，但它会是这样的:

class DevelopmentSerializer(serializers.ModelSerializer):
    class Meta:
        model = Development

class SegmentSerializer(serializers.ModelSerializer):
    development = DevelopmentSerializer(read_only=True)
    class Meta:
        many = True
        model = Segment

这告诉 SegementSerializer 在序列化 development 数据时使用 DevelopmentSerializer。默认情况下，它使用 PrimaryKeyRelatedField，这就是为什么您只看到 ID(在本例中为 10)。