django – Rest Framework教程IntegrityError创建片段

发布时间：2020-12-20 11:39:07 所属栏目：Python 来源：网络整理

导读：我正在通过Django Rest Framework教程工作,我被困在第4部分. 在为视图添加权限后,它会说创建几个片段.我通过可浏览的API登录并尝试发布这样的代码段： {"title": "snippet","code": "print 123"} 当我这样做时,我得到： / snippets /中的IntegrityError NOT

我正在通过Django Rest Framework教程工作,我被困在第4部分.

在为视图添加权限后,它会说创建几个片段.我通过可浏览的API登录并尝试发布这样的代码段：

{
"title": "snippet","code": "print 123"
}

当我这样做时,我得到：

/ snippets /中的IntegrityError

NOT NULL约束失败：snippets_snippet.owner_id

谁知道这里发生了什么？

Traceback:
File "/home/grez/restenv/lib/python3.4/site-packages/django/core/handlers/base.py" in get_response
  111.                     response = wrapped_callback(request,*callback_args,**callback_kwargs)
File "/home/grez/restenv/lib/python3.4/site-packages/django/views/decorators/csrf.py" in wrapped_view
  57.         return view_func(*args,**kwargs)
File "/home/grez/restenv/lib/python3.4/site-packages/django/views/generic/base.py" in view
  69.             return self.dispatch(request,*args,**kwargs)
File "/home/grez/restenv/lib/python3.4/site-packages/rest_framework/views.py" in dispatch
  403.             response = self.handle_exception(exc)
File "/home/grez/restenv/lib/python3.4/site-packages/rest_framework/views.py" in dispatch
  400.             response = handler(request,**kwargs)
File "/home/grez/web/resttutorial/snippets/views.py" in post
  23.             serializer.save()
File "/home/grez/restenv/lib/python3.4/site-packages/rest_framework/serializers.py" in save
  599.             self.save_object(self.object,**kwargs)
File "/home/grez/restenv/lib/python3.4/site-packages/rest_framework/serializers.py" in save_object
  1041.         obj.save(**kwargs)
File "/home/grez/web/resttutorial/snippets/models.py" in save
  36.         super(Snippet,self).save(*args,**kwargs)
File "/home/grez/restenv/lib/python3.4/site-packages/django/db/models/base.py" in save
  591.                        force_update=force_update,update_fields=update_fields)
File "/home/grez/restenv/lib/python3.4/site-packages/django/db/models/base.py" in save_base
  619.             updated = self._save_table(raw,cls,force_insert,force_update,using,update_fields)
File "/home/grez/restenv/lib/python3.4/site-packages/django/db/models/base.py" in _save_table
  700.             result = self._do_insert(cls._base_manager,fields,update_pk,raw)
File "/home/grez/restenv/lib/python3.4/site-packages/django/db/models/base.py" in _do_insert
  733.                                using=using,raw=raw)
File "/home/grez/restenv/lib/python3.4/site-packages/django/db/models/manager.py" in manager_method
  92.                 return getattr(self.get_queryset(),name)(*args,**kwargs)
File "/home/grez/restenv/lib/python3.4/site-packages/django/db/models/query.py" in _insert
  921.         return query.get_compiler(using=using).execute_sql(return_id)
File "/home/grez/restenv/lib/python3.4/site-packages/django/db/models/sql/compiler.py" in execute_sql
  920.                 cursor.execute(sql,params)
File "/home/grez/restenv/lib/python3.4/site-packages/django/db/backends/utils.py" in execute
  81.             return super(CursorDebugWrapper,self).execute(sql,params)
File "/home/grez/restenv/lib/python3.4/site-packages/django/db/backends/utils.py" in execute
  65.                 return self.cursor.execute(sql,params)
File "/home/grez/restenv/lib/python3.4/site-packages/django/db/utils.py" in __exit__
  94.                 six.reraise(dj_exc_type,dj_exc_value,traceback)
File "/home/grez/restenv/lib/python3.4/site-packages/django/utils/six.py" in reraise
  549.             raise value.with_traceback(tb)
File "/home/grez/restenv/lib/python3.4/site-packages/django/db/backends/utils.py" in execute
  65.                 return self.cursor.execute(sql,params)
File "/home/grez/restenv/lib/python3.4/site-packages/django/db/backends/sqlite3/base.py" in execute
  485.         return Database.Cursor.execute(self,query,params)

Exception Type: IntegrityError at /snippets/
Exception Value: NOT NULL constraint failed: snippets_snippet.owner_id

解决方法

我今晚正在阅读本教程并遇到同样的错误.看来教程是一个版本左右的实际框架可能呢？无论如何,经过一些研究后,我能够获得片段保存.

教程说这样做的地方：

def perform_create(self,serializer):
    serializer.save(owner=self.request.user)

我改用这个：

def pre_save(self,snip):
    snip.owner = self.request.user

似乎perform_create方法不再存在或被调用,因此所有者永远不会被设置,因此我们看到了错误.我不确定我所做的是解决问题的正确方法,但似乎有效！

这是我在上面提到的文档的链接：http://www.django-rest-framework.org/api-guide/generic-views/#genericapiview

（编辑：李大同）

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