DRF序列化器字段DictField（）AttributeError：'str'对象没有属性'items'

问题描述

在django休息框架中如果我在序列化器中使用DictField（），它在/ api / v1 / analytics / reports-configuration / 1 /
'str'对象中给出了AttributeError AttributeError没有属性'items'error.please看看。

serializers.py

  import json 
 from rest_framework import serializers 
 
 from models import ReportConfiguration 
 
 
 class ReportConfigurationSerializer（serializers.ModelSerializer）：
 report_type = serializers.ChoiceField（choices = ['query'，'activity'，'summary']）
 read_only = serializers.BooleanField（required = True）
 query_data = serializers.DictField（required = True）
 
 class Meta：
 model = ReportConfiguration 
 
 fields =（'id'，'title'，'query_data'，'created_by'，'last_activity_by'，'deleted'，
' deleted_by'，'added_at'，'last_activity_at'，'report_type'，'read_only'）
 
 
 def validate（self，data）：
如果data ['report_type']不是summary，而data ['read_only']是True：
 raise serializers.ValidationError （如果只读true，那么报告类型应该是摘要）
如果data ['report_type']是'summary'，data ['read_only']不是True：
 raise serializers.ValidationError（如果只读不正确，那么报告类型不应该是摘要）
返回数据
 
 def create（self，validated_data）：
 validated_data ['created_by'] = self.context ['request']。user 
 validated_data ['last_activity_by'] = self.context ['request']。user 
 return ReportConfiguration.objects.create（** validated_data）
  

views.py

  class ReportConfigurationViewSet（viewsets.ModelViewSet）：
 serializer_class = ReportConfigurationSerializer 
 queryset = ReportConfiguration.obj ects.all（）
 permission_classes =（permissions.IsAuthenticated，）
 filter_backends =（DjangoFilterBackend）
 filter_class = ReportFilter 
 
 def list（self，request）： 
 response = super（ReportConfigurationViewSet，self）.list（request）
在response.data ['results']中的数据：
 data ['query_data'] = json.loads（data [ 'query_data']）
 return response 
 
 def retrieve（self，request，pk = None）：
 response = super（ReportConfigurationViewSet，self）.retrieve（request，pk = pk）
 response.data ['query_data'] = json.loads（response.data ['query_data']）
返回响应
  

models.py

  class ReportConfiguration（models.Model）：
 class ReportTypeChoice（Choice）：
 QueryReport ='query'
 ActivityReport ='activity'
 SummaryList ='summary'
 
 title = models.CharField（max_length = 300，unique = True，blank = False，null = False）
 query_data = JSONField（default = {}）
 created_by = models.ForeignKey（User，null = blank = True，related_name ='report_created_by'）
 last_activity_by = models.ForeignKey（User，null = True，blank = True，related_name ='last_active_in_report'）
 deleted = models.BooleanField（default = False） 
 deleted_by = models.ForeignKey（User，null = True，blank = True，related_name ='report_deleted_by'）
 added_at = models.DateTimeField（auto_now_add = True）
 last_activity_at = models.DateTimeField default = timezone.now）
 report_type = models.CharField（max_length = 15，choices = ReportTypeChoice）
 read_only = models.BooleanField（default = False）
  / pre> 
 
 
错误：
 启动开发服务器在http： /127.0.0.1:8000/ 
使用CONTROL-C退出服务器。 
错误内部服务器错误：/ api / v1 / analytics / reports-configuration / 1 / 
追溯（最近的最后一次呼叫）：
文件/Users/ranvijay.s/.virtualenvs/ my_project / lib / python2.7 / site-packages / django / core / handlers / base.py，第149行，get_response 
 response = self.process_exception_by_middleware（e，request）
文件/ Users /ranvijay.s/.virtualenvs/my_project/lib/python2.7/site-packages/django/core/handlers/base.py，第147行，在get_response 
 response = wrapped_callback（request，* callback_args，* * callback_kwargs）
文件/Users/ranvijay.s/.virtualenvs/my_project/lib/python2.7/site-packages/django/views/decorators/csrf.py，第58行，wrapped_view 
 return view_func（* args，** kwargs）
文件/Users/ranvijay.s/.virtualenvs/my_project/lib/python2.7/site-packages/rest_framework/viewsets.py，第83行，查看
 return self.dispatch（request，* args，** kwargs）
文件/Users/ranvijay.s/.virtualenvs/my_project/lib/python2.7/site-packages/ rest_framework / views.py，第477行，在调度中
 response = self.handle_exception（exc）
文件/Users/ranvijay.s/.virtualenvs/my_project/lib/python2.7/site- package / rest_framework / views.py，第437行，handle_exception 
 self.raise_uncaught_exception（exc）
文件/Users/ranvijay.s/.virtualenvs/my_project/lib/python2.7/site- package / rest_framework / views.py，第474行，在调度中
 response = handler（request，* args，** kwargs）
文件/Users/ranvijay.s/wk/project/django/ dhanalytics / views.py，第47行，检索
 response = super（ReportConfigurationViewSet，self）.retrieve（request，pk = pk）
文件/Users/ranvijay.s/.virtualenvs/my_project /lib/python2.7/site-packages/rest_framework/mixins.py，第58行，检索
返回响应（serializer.data）
文件/Users/ranvijay.s/.virtualenvs/ my_project / lib / python2.7 / site-packages / rest_framework / serializers.py，第527行，数据
 ret = super（Serializer，self）.data 
 Fi le/Users/ranvijay.s/.virtualenvs/my_project/lib/python2.7/site-packages/rest_framework/serializers.py，第262行，数据
 self._data = self.to_representation（self。实例）
文件/Users/ranvijay.s/.virtualenvs/my_project/lib/python2.7/site-packages/rest_framework/serializers.py，第496行，to_representation 
 ret [field。 field_name] = field.to_representation（attribute）
文件/Users/ranvijay.s/.virtualenvs/my_project/lib/python2.7/site-packages/rest_framework/fields.py，第1601行，to_representation 
为key，val为value.items（）
 AttributeError：'str'对象没有属性'items'
  
解决方案
你需要传递DictField需要通过
  d验证的子字段ocument = DictField（child = CharField（））
  
 
In django rest framework If i use DictField() in serializer its given me AttributeError at /api/v1/analytics/reports-configuration/1/‘str’ object has no attribute ‘items’ error.please take a look.
serializers.py
import json
from rest_framework import serializers

from models import ReportConfiguration


class ReportConfigurationSerializer(serializers.ModelSerializer):
    report_type = serializers.ChoiceField(choices=['query', 'activity', 'summary'])
    read_only = serializers.BooleanField(required=True)
    query_data = serializers.DictField(required=True)

    class Meta:
        model = ReportConfiguration

        fields = ('id', 'title', 'query_data', 'created_by', 'last_activity_by', 'deleted',
                  'deleted_by', 'added_at', 'last_activity_at', 'report_type', 'read_only')


    def validate(self, data):
        if data['report_type'] is not 'summary' and data['read_only'] is True:
            raise serializers.ValidationError("If read only true then report type should be summary")
        if data['report_type'] is 'summary' and data['read_only'] is not True:
            raise serializers.ValidationError("If read only not true then report type should not be summary")
        return data

    def create(self, validated_data):
        validated_data['created_by'] = self.context['request'].user
        validated_data['last_activity_by'] = self.context['request'].user
        return ReportConfiguration.objects.create(**validated_data)
views.py
class ReportConfigurationViewSet(viewsets.ModelViewSet):
    serializer_class = ReportConfigurationSerializer
    queryset = ReportConfiguration.objects.all()
    permission_classes = (permissions.IsAuthenticated,)
    filter_backends = (DjangoFilterBackend,)
    filter_class = ReportFilter

    def list(self, request):
        response = super(ReportConfigurationViewSet, self).list(request)
        for data in response.data['results']:
            data['query_data'] = json.loads(data['query_data'])
        return response

    def retrieve(self, request, pk=None):
        response = super(ReportConfigurationViewSet, self).retrieve(request, pk=pk)
        response.data['query_data'] = json.loads(response.data['query_data'])
        return response 
models.py
class ReportConfiguration(models.Model):
    class ReportTypeChoice(Choice):
        QueryReport = 'query'
        ActivityReport = 'activity'
        SummaryList = 'summary'

    title = models.CharField(max_length=300, unique=True, blank=False, null=False)
    query_data = JSONField(default={})
    created_by = models.ForeignKey(User, null=True, blank=True, related_name='report_created_by')
    last_activity_by = models.ForeignKey(User, null=True, blank=True,related_name='last_active_in_report')
    deleted = models.BooleanField(default=False)
    deleted_by = models.ForeignKey(User, null=True, blank=True, related_name='report_deleted_by')
    added_at = models.DateTimeField(auto_now_add=True)
    last_activity_at = models.DateTimeField(default=timezone.now)
    report_type = models.CharField(max_length=15, choices=ReportTypeChoice)
    read_only = models.BooleanField(default=False)
Error:
Starting development server at http://127.0.0.1:8000/
Quit the server with CONTROL-C.
ERROR Internal Server Error: /api/v1/analytics/reports-configuration/1/
Traceback (most recent call last):
  File "/Users/ranvijay.s/.virtualenvs/my_project/lib/python2.7/site-packages/django/core/handlers/base.py", line 149, in get_response
    response = self.process_exception_by_middleware(e, request)
  File "/Users/ranvijay.s/.virtualenvs/my_project/lib/python2.7/site-packages/django/core/handlers/base.py", line 147, in get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/Users/ranvijay.s/.virtualenvs/my_project/lib/python2.7/site-packages/django/views/decorators/csrf.py", line 58, in wrapped_view
    return view_func(*args, **kwargs)
  File "/Users/ranvijay.s/.virtualenvs/my_project/lib/python2.7/site-packages/rest_framework/viewsets.py", line 83, in view
    return self.dispatch(request, *args, **kwargs)
  File "/Users/ranvijay.s/.virtualenvs/my_project/lib/python2.7/site-packages/rest_framework/views.py", line 477, in dispatch
    response = self.handle_exception(exc)
  File "/Users/ranvijay.s/.virtualenvs/my_project/lib/python2.7/site-packages/rest_framework/views.py", line 437, in handle_exception
    self.raise_uncaught_exception(exc)
  File "/Users/ranvijay.s/.virtualenvs/my_project/lib/python2.7/site-packages/rest_framework/views.py", line 474, in dispatch
    response = handler(request, *args, **kwargs)
  File "/Users/ranvijay.s/wk/project/django/dhanalytics/views.py", line 47, in retrieve
    response = super(ReportConfigurationViewSet, self).retrieve(request, pk=pk)
  File "/Users/ranvijay.s/.virtualenvs/my_project/lib/python2.7/site-packages/rest_framework/mixins.py", line 58, in retrieve
    return Response(serializer.data)
  File "/Users/ranvijay.s/.virtualenvs/my_project/lib/python2.7/site-packages/rest_framework/serializers.py", line 527, in data
    ret = super(Serializer, self).data
  File "/Users/ranvijay.s/.virtualenvs/my_project/lib/python2.7/site-packages/rest_framework/serializers.py", line 262, in data
    self._data = self.to_representation(self.instance)
  File "/Users/ranvijay.s/.virtualenvs/my_project/lib/python2.7/site-packages/rest_framework/serializers.py", line 496, in to_representation
    ret[field.field_name] = field.to_representation(attribute)
  File "/Users/ranvijay.s/.virtualenvs/my_project/lib/python2.7/site-packages/rest_framework/fields.py", line 1601, in to_representation
    for key, val in value.items()
AttributeError: 'str' object has no attribute 'items'
 解决方案 
you need to pass the child field which the DictField needs to get validated with
document = DictField(child=CharField())
                        
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