Feld erforderlich für eine verschachtelte Django Ruhe Serializer

Question

Ich habe folgende Struktur:

Modelle

class Customer(models.Model): 
    name = models.ForeignKey(Candidate) 
    candidate_test = models.ForeignKey(CandidateTest, null=True) 
    # Other fields 

class Candidate(models.Model): 
    first_name = models.CharField(max_length=40) 
    # Other fields 

class CandidateTest(models.Model): 
    test_id = models.ForeignKey(Test) 
    # 2 more fields with Foreign Key and null, blank both are True 

class Test(models.Model): 
    test_name = models.CharField() 
    # 2 more fields with Foreign Key and null, blank both are True 

Serializer

class CandidateSerializer(serializers.ModelSerializer): 
    class Meta: 
     model = Candidate 
     fields = ('first_name', # other fields) 


class TestSerializer(serializers.ModelSerializer): 
    class Meta: 
     model = Test 
     fields = ('id', 'test_name',) 


class CandidateTestSerializer(serializers.ModelSerializer): 
    test_id = TestSerializer() 

    class Meta: 
     model = CandidateTest 
     fields = ('id', 'test_id') 


class CustomerSerializer(serializers.ModelSerializer): 
    name = CandidateSerializer() 
    candidate_test = CandidateTestSerializer() 

    class Meta: 
     model = Customer 
     fields = ('id', 'name', 'candidate_test') 

Wenn ich jetzt einreichen (POST) Form Django Rest Framework's browsable API Ich bekomme folgenden Fehler:

'list' object has no attribute 'get' 

Im Anschluss an die Stacktrace:

Error during template rendering 

In template /srv/www/safe/shared/env/local/lib/python2.7/site-packages /rest_framework/templates/rest_framework/horizontal/fieldset.html, error at line 11 
'list' object has no attribute 'get' 
1 {% load rest_framework %} 
2 <fieldset> 
3  {% if field.label %} 
4  <div class="form-group" style="border-bottom: 1px solid #e5e5e5"> 
5   <legend class="control-label col-sm-2 {% if style.hide_label %}sr-only{% endif %}" style="border-bottom: 0"> 
6   {{ field.label }} 
7   </legend> 
8  </div> 
9  {% endif %} 
10 
11 

    {% for nested_field in field %} 



12  {% if not nested_field.read_only %} 
13  {% render_field nested_field style=style %} 
14  {% endif %} 
15 {% endfor %} 
16 </fieldset> 
17 
Traceback Switch to copy-and-paste view 

/srv/www/safe/shared/env/local/lib/python2.7/site-packages/django/core/handlers/base.py in get_response 

           response = response.render() 

    ... 
▶ Local vars 
/srv/www/safe/shared/env/local/lib/python2.7/site-packages/django/template/response.py in render 

          self.content = self.rendered_content 

    ... 
▶ Local vars 
/srv/www/safe/shared/env/local/lib/python2.7/site-packages/rest_framework/response.py in rendered_content 

         ret = renderer.render(self.data, media_type, context) 

    ... 
▶ Local vars 
/srv/www/safe/shared/env/local/lib/python2.7/site-packages/rest_framework/renderers.py in render 

         context = self.get_context(data, accepted_media_type, renderer_context) 

    ... 
▶ Local vars 
/srv/www/safe/shared/env/local/lib/python2.7/site-packages/rest_framework/renderers.py in get_context 

          'post_form': self.get_rendered_html_form(data, view, 'POST', request), 

    ... 
▶ Local vars 
/srv/www/safe/shared/env/local/lib/python2.7/site-packages/rest_framework/renderers.py in get_rendered_html_form 

            [('template', 'rest_framework/api_form.html')] 

    ... 
▶ Local vars 
/srv/www/safe/shared/env/local/lib/python2.7/site-packages/rest_framework/renderers.py in render 

         return template.render(context) 

    ... 
▶ Local vars 
/srv/www/safe/shared/env/local/lib/python2.7/site-packages/django/template/backends/django.py in render 

         return self.template.render(context) 

    ... 
▶ Local vars 
/srv/www/safe/shared/env/local/lib/python2.7/site-packages/django/template/base.py in render 

            return self._render(context) 

    ... 
▶ Local vars 
/srv/www/safe/shared/env/local/lib/python2.7/site-packages/django/template/base.py in _render 

         return self.nodelist.render(context) 

    ... 
▶ Local vars 
/srv/www/safe/shared/env/local/lib/python2.7/site-packages/django/template/base.py in render 

           bit = self.render_node(node, context) 

    ... 
▶ Local vars 
/srv/www/safe/shared/env/local/lib/python2.7/site-packages/django/template/debug.py in render_node 

          return node.render(context) 

    ... 
▶ Local vars 
/srv/www/safe/shared/env/local/lib/python2.7/site-packages/django/template/defaulttags.py in render 

              nodelist.append(node.render(context)) 

    ... 
▶ Local vars 
/srv/www/safe/shared/env/local/lib/python2.7/site-packages/django/template/defaulttags.py in render 

           return nodelist.render(context) 

    ... 
▶ Local vars 
/srv/www/safe/shared/env/local/lib/python2.7/site-packages/django/template/base.py in render 

           bit = self.render_node(node, context) 

    ... 
▶ Local vars 
/srv/www/safe/shared/env/local/lib/python2.7/site-packages/django/template/debug.py in render_node 

          return node.render(context) 

    ... 
▶ Local vars 
/srv/www/safe/shared/env/local/lib/python2.7/site-packages/django/template/base.py in render 

            return func(*resolved_args, **resolved_kwargs) 

    ... 
▶ Local vars 
/srv/www/safe/shared/env/local/lib/python2.7/site-packages/rest_framework/templatetags/rest_framework.py in render_field 

        return renderer.render_field(field, style) 

    ... 
▶ Local vars 
/srv/www/safe/shared/env/local/lib/python2.7/site-packages/rest_framework/renderers.py in render_field 

         return template.render(context) 

    ... 
▶ Local vars 
/srv/www/safe/shared/env/local/lib/python2.7/site-packages/django/template/backends/django.py in render 

         return self.template.render(context) 

    ... 
▶ Local vars 
/srv/www/safe/shared/env/local/lib/python2.7/site-packages/django/template/base.py in render 

            return self._render(context) 

    ... 
▶ Local vars 
/srv/www/safe/shared/env/local/lib/python2.7/site-packages/django/template/base.py in _render 

         return self.nodelist.render(context) 

    ... 
▶ Local vars 
/srv/www/safe/shared/env/local/lib/python2.7/site-packages/django/template/base.py in render 

           bit = self.render_node(node, context) 

    ... 
▶ Local vars 
/srv/www/safe/shared/env/local/lib/python2.7/site-packages/django/template/debug.py in render_node 

          return node.render(context) 

    ... 
▶ Local vars 
/srv/www/safe/shared/env/local/lib/python2.7/site-packages/django/template/defaulttags.py in render 

              nodelist.append(node.render(context)) 

    ... 
▶ Local vars 
/srv/www/safe/shared/env/local/lib/python2.7/site-packages/django/template/defaulttags.py in render 

           return nodelist.render(context) 

    ... 
▶ Local vars 
/srv/www/safe/shared/env/local/lib/python2.7/site-packages/django/template/base.py in render 

           bit = self.render_node(node, context) 

    ... 
▶ Local vars 
/srv/www/safe/shared/env/local/lib/python2.7/site-packages/django/template/debug.py in render_node 

          return node.render(context) 

    ... 
▶ Local vars 
/srv/www/safe/shared/env/local/lib/python2.7/site-packages/django/template/base.py in render 

            return func(*resolved_args, **resolved_kwargs) 

    ... 
▶ Local vars 
/srv/www/safe/shared/env/local/lib/python2.7/site-packages/rest_framework/templatetags/rest_framework.py in render_field 

        return renderer.render_field(field, style) 

    ... 
▶ Local vars 
/srv/www/safe/shared/env/local/lib/python2.7/site-packages/rest_framework/renderers.py in render_field 

         return template.render(context) 

    ... 
▶ Local vars 
/srv/www/safe/shared/env/local/lib/python2.7/site-packages/django/template/backends/django.py in render 

         return self.template.render(context) 

    ... 
▶ Local vars 
/srv/www/safe/shared/env/local/lib/python2.7/site-packages/django/template/base.py in render 

            return self._render(context) 

    ... 
▶ Local vars 
/srv/www/safe/shared/env/local/lib/python2.7/site-packages/django/template/base.py in _render 

         return self.nodelist.render(context) 

    ... 
▶ Local vars 
/srv/www/safe/shared/env/local/lib/python2.7/site-packages/django/template/base.py in render 

           bit = self.render_node(node, context) 

    ... 
▶ Local vars 
/srv/www/safe/shared/env/local/lib/python2.7/site-packages/django/template/debug.py in render_node 

          return node.render(context) 

    ... 
▶ Local vars 
/srv/www/safe/shared/env/local/lib/python2.7/site-packages/django/template/defaulttags.py in render 

           values = list(values) 

    ... 
▶ Local vars 
/srv/www/safe/shared/env/local/lib/python2.7/site-packages/rest_framework/utils/serializer_helpers.py in __iter__ 

          yield self[field.field_name] 

    ... 
▶ Local vars 
/srv/www/safe/shared/env/local/lib/python2.7/site-packages/rest_framework/utils/serializer_helpers.py in __getitem__ 

         error = self.errors.get(key) if self.errors else None 

    ... 
▼ Local vars 
Variable Value 
field 

IntegerField(label='ID', read_only=True) 

self  

<NestedBoundField value={} errors=[u'This field is required.']> 

key  

'id' 

value 

None 

Beachten Sie auch, dass die Anfragen mit seiner adaequat ...

Answer 1

Sie haben einen Tippfehler in Ihrem CustomerSerializer Serializer:

candidate_test = CustomerSerializer() 

sollte wahrscheinlich sein:

candidate_test = CandidateTestSerializer() 

Answer 2

Dies ist ein Fehler in Ruhe Rahmen ist, und es ist festgelegt noch nicht: dieser https://github.com/tomchristie/django-rest-framework/issues/4073

es zu beheben, ist die einzige Art, wie ich so weit herausgefunden:

in der Klasse von ModelSerializer geerbt oder Serializer, außer Kraft setzen __getitem__ Methode:

def __getitem__(self, key): 
    field = self.fields[key] 
    value = self.data.get(key) 
    error = self.errors.get(key) if hasattr(self, '_errors') else None 
    if isinstance(field, serializers.Serializer): 
     return NestedBoundField(field, value, field.data) 
    return BoundField(field, value, error) 

es field.data statt Fehler überliefern würde, könnten einige weitere Probleme verursachen, aber bisher ist es besser als Fehler als Liste nach unten vorbei (ne sted Serializer erwartet Fehlerbaum vollständig gefüllt werden, aber es empfängt übergeordnete Fehlermeldung statt)