使用模型的DjangoREST页面上传文件时出现奇怪的错误。这是下面的模型
class Documents(models.Model):
id = models.AutoField(primary_key=True)
file = models.ForeignKey(Files, related_name="files")
divider_name = models.TextField(null=True, verbose_name="Divider", blank=True)
separator = models.TextField(null=True, verbose_name="Separator", blank=True)
date_changed = models.DateTimeField(auto_now_add=True, verbose_name="Date Changed", blank=True)
date_document = models.DateTimeField(auto_now_add=True, verbose_name="Document Date", blank=True)
date_created = models.DateTimeField(auto_now_add=True, auto_now=True, verbose_name="Date Created", blank=True)
date_filed = models.DateTimeField(auto_now_add=True, auto_now=True, verbose_name="Date Uploaded", blank=True)
last_viewed = models.DateTimeField(auto_now_add=True, auto_now=True, verbose_name="Last Viewed", blank=True)
status = models.IntegerField(default=1, verbose_name="Deleted", blank=True)
sort_order = models.IntegerField(default=1, blank=True)
description = models.TextField(verbose_name="Document Details", blank=True)
user_filed = models.IntegerField(verbose_name="Filed By", blank=True)
user_created = models.IntegerField(verbose_name="Created By", blank=True)
document_locked = models.IntegerField()
document_secured = models.IntegerField()
document_encrypted = models.IntegerField()
archive_documentid = models.IntegerField()
extension = models.TextField()
pages = models.IntegerField()
file_size = models.IntegerField()
full_text = models.TextField(null=True, blank=True)
document_cleaned = models.IntegerField(null=True, blank=True)
bacth_date = models.DateTimeField(auto_now_add=False, null=True, blank=True)
document_contents = models.TextField(null=True, blank=True)
process_stepid = models.IntegerField(null=True, blank=True)
rev_document_id = models.IntegerField(null=True, blank=True)
document_location = models.FileField(upload_to=settings.MEDIA_ROOT)
def __unicode__(self):
return self.id
class Meta:
permissions = (('can_view_document', 'Can View Document'),
('can_not_view_document', 'Can Not View Document'),
('can_delete_document', 'Can Delete Document'),
('can_edit_document', 'Can Edit Document'),
('can_export_document', 'Can Export Document'),
('can_move_document', 'Can Move Document'),
('can_add_document', 'Can Add Document'),)
verbose_name = "Document"
verbose_name_plural = "Documents"
这是序列化程序
class DocumentSerializer(serializers.ModelSerializer):
file_id = serializers.PrimaryKeyRelatedField(queryset=Files.objects.all(), many=False)
class Meta:
model = Documents
fields = ('id','file_id', 'divider_name', 'separator', 'date_changed', 'date_document', 'date_created'
, 'date_filed', 'last_viewed', 'status', 'sort_order', 'description', 'user_filed', 'user_created'
, 'document_locked', 'document_secured', 'document_encrypted', 'archive_documentid', 'extension'
, 'pages', 'file_size', 'eform_id', 'full_text', 'document_cleaned', 'bacth_date', 'document_contents'
, 'eform_due', 'efrom_complete', 'process_stepid', 'rev_document_id', 'document_location')
这是视图
class DocumentsViewSet(generics.ListCreateAPIView):
"""
API endpoint that allows documentss to be viewed or edited.
"""
queryset = Documents.objects.all()
serializer_class = DocumentSerializer
因此，当我点击提交附带的PNG文件时，它会给我错误。
Request Method: POST
Request URL: http://localhost:8080/documents/
Django Version: 1.6
Exception Type: TypeError
Exception Value:
int() argument must be a string or a number, not 'Files'
Exception Location: /usr/local/lib/python2.7/dist-packages/django/db/models/fields/__init__.py in get_prep_value, line 613
Python Executable: /usr/bin/python
Python Version: 2.7.3
错误讯息：
Environment:
Request Method: POST
Request URL: http://localhost:8080/documents/
Django Version: 1.6
Python Version: 2.7.3
Installed Applications:
('django.contrib.auth',
'django.contrib.contenttypes',
'django.contrib.sessions',
'django.contrib.sites',
'django.contrib.messages',
'django.contrib.staticfiles',
'django.contrib.admin',
'django.contrib.admindocs',
'south',
'rest_framework',
'guardian',
'avatar',
'django_tables2',
'serializers',
'templatetag_handlebars',,
'main',
'administration',
'api')
Installed Middleware:
('django.middleware.common.CommonMiddleware',
'django.contrib.sessions.middleware.SessionMiddleware',
'django.middleware.csrf.CsrfViewMiddleware',
'django.contrib.auth.middleware.AuthenticationMiddleware',
'django.contrib.messages.middleware.MessageMiddleware',
'django.middleware.clickjacking.XFrameOptionsMiddleware')
Traceback:
File "/usr/local/lib/python2.7/dist-packages/django/core/handlers/base.py" in get_response
114. response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "/usr/local/lib/python2.7/dist-packages/django/views/generic/base.py" in view
69. return self.dispatch(request, *args, **kwargs)
File "/usr/local/lib/python2.7/dist-packages/django/views/decorators/csrf.py" in wrapped_view
57. return view_func(*args, **kwargs)
File "/usr/local/lib/python2.7/dist-packages/rest_framework/views.py" in dispatch
399. response = self.handle_exception(exc)
File "/usr/local/lib/python2.7/dist-packages/rest_framework/views.py" in dispatch
396. response = handler(request, *args, **kwargs)
File "/usr/local/lib/python2.7/dist-packages/rest_framework/generics.py" in post
456. return self.create(request, *args, **kwargs)
File "/usr/local/lib/python2.7/dist-packages/rest_framework/mixins.py" in create
52. self.object = serializer.save(force_insert=True)
File "/usr/local/lib/python2.7/dist-packages/rest_framework/serializers.py" in save
560. self.save_object(self.object, **kwargs)
File "/usr/local/lib/python2.7/dist-packages/rest_framework/serializers.py" in save_object
935. obj.save(**kwargs)
File "/usr/local/lib/python2.7/dist-packages/django/db/models/base.py" in save
545. force_update=force_update, update_fields=update_fields)
File "/usr/local/lib/python2.7/dist-packages/django/db/models/base.py" in save_base
573. updated = self._save_table(raw, cls, force_insert, force_update, using, update_fields)
File "/usr/local/lib/python2.7/dist-packages/django/db/models/base.py" in _save_table
654. result = self._do_insert(cls._base_manager, using, fields, update_pk, raw)
File "/usr/local/lib/python2.7/dist-packages/django/db/models/base.py" in _do_insert
687. using=using, raw=raw)
File "/usr/local/lib/python2.7/dist-packages/django/db/models/manager.py" in _insert
232. return insert_query(self.model, objs, fields, **kwargs)
File "/usr/local/lib/python2.7/dist-packages/django/db/models/query.py" in insert_query
1511. return query.get_compiler(using=using).execute_sql(return_id)
File "/usr/local/lib/python2.7/dist-packages/django/db/models/sql/compiler.py" in execute_sql
897. for sql, params in self.as_sql():
File "/usr/local/lib/python2.7/dist-packages/django/db/models/sql/compiler.py" in as_sql
855. for obj in self.query.objs
File "/usr/local/lib/python2.7/dist-packages/django/db/models/fields/related.py" in get_db_prep_save
1224. connection=connection)
File "/usr/local/lib/python2.7/dist-packages/django/db/models/fields/__init__.py" in get_db_prep_save
350. prepared=False)
File "/usr/local/lib/python2.7/dist-packages/django/db/models/fields/__init__.py" in get_db_prep_value
606. value = self.get_prep_value(value)
File "/usr/local/lib/python2.7/dist-packages/django/db/models/fields/__init__.py" in get_prep_value
613. return int(value)
Exception Type: TypeError at /documents/
Exception Value: int() argument must be a string or a number, not 'Files'
答案 0 :(得分：4)
您必须告诉序列化程序您希望从哪个模型字段获取值。
class DocumentSerializer(serializers.ModelSerializer):
file_id = serializers.PrimaryKeyRelatedField(queryset=Files.objects.all(),
source='file')
因为如果你不这样做，restframework会尝试使用序列化程序中定义的名称，因此它将使用file_id，而Documents模型中实际上并不存在。
# this is how PrimaryKeyRelatedField resolves its pk value
pk = getattr(obj, self.source or field_name).pk