IntegrityError when sending multiple post requests - django

Question

I am sending a post request for each tag
front-end is here:
handleOnClick() {
const { resource, csrf } = this.props;
let postFunc = (ele) => {
const label = ele.label.toLowerCase()
request
.post(`/bookmarks/groups/${label}`)
.set('X-CSRFToken', csrf)
.send(resource.id).then(() => {
console.log('we did it')
})
}
_(this.state.multiValue).forEach(postFunc)
Both post request seem to deliver, but any one after the first get and integrity error.
My view:
def post(self, request, slug):
"""Create a bookmark of the resource for the current user."""
# print request.user
to_add = Resource.objects.get(id=int(request.body))
try:
bm = Bookmark.objects.get(resource=to_add)
except Bookmark.DoesNotExist:
bm = Bookmark.objects.create(user=request.user, resource=to_add)
bookmark_group = BookmarkGroup.objects.get(name=slug)
bookmark_group.bookmarks.add(bm)
return JsonResponse({}, status=201, safe=False)
I am essentially checking to see if a bookmark is exists, and if it doesn't I create it.
Bookmark and group models:
class Bookmark(models.Model):
user = models.ForeignKey(User, on_delete=models.CASCADE)
resource = models.ForeignKey("Resource", on_delete=models.CASCADE, related_name="bookmarks")
# meta
created_at = models.DateTimeField(auto_now_add=True)
modified_at = models.DateTimeField(auto_now=True)
class Meta:
unique_together = ('user', 'resource',)
ordering = ('resource',)
def __str__(self):
return "{} | {}".format(self.user, self.resource)
class BookmarkGroup(models.Model):
name = models.CharField(max_length=50)
slug = models.SlugField(null=False, unique=True)
bookmarks = models.ManyToManyField(Bookmark, related_name='bookmarks', blank=True)
def __str__(self):
return self.name
I've included the stack-trace, and can include more code if needed:
Traceback (most recent call last):
File "/Users/path/to/my/venv/lib/python2.7/site-packages/django/core/handlers/exception.py", line 41, in inner
response = get_response(request)
File "/Users/path/to/my/venv/lib/python2.7/site-packages/django/core/handlers/base.py", line 187, in _get_response
response = self.process_exception_by_middleware(e, request)
File "/Users/path/to/my/venv/lib/python2.7/site-packages/django/core/handlers/base.py", line 185, in _get_response
response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "/Users/path/to/my/venv/lib/python2.7/site-packages/django/contrib/auth/decorators.py", line 23, in _wrapped_view
return view_func(request, *args, **kwargs)
File "/Users/path/to/my/venv/lib/python2.7/site-packages/django/views/generic/base.py", line 68, in view
return self.dispatch(request, *args, **kwargs)
File "/Users/path/to/my/venv/lib/python2.7/site-packages/django/views/generic/base.py", line 88, in dispatch
return handler(request, *args, **kwargs)
File "/Users/path/to/my/app/views/bookmark_group.py", line 37, in post
bm = Bookmark.objects.create(user=request.user, resource=to_add)
File "/Users/path/to/my/venv/lib/python2.7/site-packages/django/db/models/manager.py", line 85, in manager_method
return getattr(self.get_queryset(), name)(*args, **kwargs)
File "/Users/path/to/my/venv/lib/python2.7/site-packages/django/db/models/query.py", line 394, in create
obj.save(force_insert=True, using=self.db)
File "/Users/path/to/my/venv/lib/python2.7/site-packages/django/db/models/base.py", line 806, in save
force_update=force_update, update_fields=update_fields)
File "/Users/path/to/my/venv/lib/python2.7/site-packages/django/db/models/base.py", line 836, in save_base
updated = self._save_table(raw, cls, force_insert, force_update, using, update_fields)
File "/Users/path/to/my/venv/lib/python2.7/site-packages/django/db/models/base.py", line 922, in _save_table
result = self._do_insert(cls._base_manager, using, fields, update_pk, raw)
File "/Users/path/to/my/venv/lib/python2.7/site-packages/django/db/models/base.py", line 961, in _do_insert
using=using, raw=raw)
File "/Users/path/to/my/venv/lib/python2.7/site-packages/django/db/models/manager.py", line 85, in manager_method
return getattr(self.get_queryset(), name)(*args, **kwargs)
File "/Users/path/to/my/venv/lib/python2.7/site-packages/django/db/models/query.py", line 1061, in _insert
return query.get_compiler(using=using).execute_sql(return_id)
File "/Users/path/to/my/venv/lib/python2.7/site-packages/django/db/models/sql/compiler.py", line 1099, in execute_sql
cursor.execute(sql, params)
File "/Users/path/to/my/venv/lib/python2.7/site-packages/debug_toolbar/panels/sql/tracking.py", line 164, in execute
return self._record(self.cursor.execute, sql, params)
File "/Users/path/to/my/venv/lib/python2.7/site-packages/debug_toolbar/panels/sql/tracking.py", line 106, in _record
return method(sql, params)
File "/Users/path/to/my/venv/lib/python2.7/site-packages/django/db/backends/utils.py", line 80, in execute
return super(CursorDebugWrapper, self).execute(sql, params)
File "/Users/path/to/my/venv/lib/python2.7/site-packages/django/db/backends/utils.py", line 65, in execute
return self.cursor.execute(sql, params)
File "/Users/path/to/my/venv/lib/python2.7/site-packages/django/db/utils.py", line 94, in __exit__
six.reraise(dj_exc_type, dj_exc_value, traceback)
File "/Users/path/to/my/venv/lib/python2.7/site-packages/django/db/backends/utils.py", line 65, in execute
return self.cursor.execute(sql, params)
File "/Users/path/to/my/venv/lib/python2.7/site-packages/django/db/backends/mysql/base.py", line 101, in execute
return self.cursor.execute(query, args)
File "/Users/path/to/my/venv/lib/python2.7/site-packages/MySQLdb/cursors.py", line 205, in execute
self.errorhandler(self, exc, value)
File "/Users/path/to/my/venv/lib/python2.7/site-packages/MySQLdb/connections.py", line 36, in defaulterrorhandler
raise errorclass, errorvalue
IntegrityError: (1062, "Duplicate entry '1-2728' for key 'app_bookmark_user_id_resource_id_a01d1abf_uniq'")

Answer 1

From your traceback this line causing the exception,
bm = Bookmark.objects.create(user=request.user, resource=to_add)Ther error is because of you defined unique_together = ('user', 'resource',).
I would suggest you to change your views.py as below
def post(self, request, slug):
"""Create a bookmark of the resource for the current user."""
to_add = Resource.objects.get(id=int(request.body))
# Changes starts
bm, created = Bookmark.objects.get_or_create(user=request.user, resource=to_add)
bookmark_group = BookmarkGroup.objects.get(name=slug)
bookmark_group.bookmarks.add(bm)
return JsonResponse({}, status=201, safe=False)
or you can simply change ,
bm = Bookmark.objects.get(resource=to_add) to bm = Bookmark.objects.get(resource=to_add,user=request.user)