I am using a custom Queryset as manager for my model like this.
class EmployeeQuerySet(QuerySet):
def update(self, **kwargs):
# some checks
super().update(**kwargs)
class EmployeeManager(BaseManager.from_queryset(EmployeeQuerySet)):
pass
class Employee(models.Model):
objects = EmployeeManager
(In some other application related to vacations)
class Vacation(models.Model):
employee = models.ForeignKey(Employee)
(Vacation application has pretty standered Serializer and ViewSet for Vacation Model).
Error happens when I try to get /vacation/ end point. (DRF browsable API tries to render choices for employee field.)
Everything works as expected but there is a check in django-rest-framework (relations.py). This check fails for my model. Actually they are checking type against Manager class but my manager is of type BaseManager (as expected) not Manager.
This triggers an error by returning manager instead of queryset. Is there any way to make this check true from my side? (inheriting from Manager is not a choice) though I think this should be updated with a PR in DRF.
Traceback
File "/home/nafees/.venvs/shift/lib/python3.7/site-packages/django/template/base.py", line 904, in render_annotated
return self.render(context)
File "/home/nafees/.venvs/shift/lib/python3.7/site-packages/django/template/defaulttags.py", line 161, in render
values = self.sequence.resolve(context, ignore_failures=True)
File "/home/nafees/.venvs/shift/lib/python3.7/site-packages/django/template/base.py", line 671, in resolve
obj = self.var.resolve(context)
File "/home/nafees/.venvs/shift/lib/python3.7/site-packages/django/template/base.py", line 796, in resolve
value = self._resolve_lookup(context)
File "/home/nafees/.venvs/shift/lib/python3.7/site-packages/django/template/base.py", line 858, in _resolve_lookup
current = current()
File "/home/nafees/.venvs/shift/lib/python3.7/site-packages/rest_framework/relations.py", line 222, in iter_options
self.get_choices(cutoff=self.html_cutoff),
File "/home/nafees/.venvs/shift/lib/python3.7/site-packages/rest_framework/relations.py", line 202, in get_choices
queryset = queryset[:cutoff]
TypeError: 'EmployeeManager' object is not subscriptable
The Django documentation recommends the manager to inherit from models.Manager so does DRF.
You might be confused by the Django documentation naming BaseManager something that's not models.BaseManager but instead a base manager that inherits from models.Manager.
You are probably using a ModelManager instead of a Queryset
Example :
Employee.objects ==> Employee.objects.all()
Related
The request to the embedded field of MongoEngineResource doesn't go through Authentication process, if it contains reference field.
My case is the following:
there is a document Section, which consist of FieldDefinitions
FieldDefinitions are EmbeddedDocuments
FieldDefinition contains embedded_section (optional), which references to the Section, and there is a signal that excludes self-referencing (e.g. embedded_section can only reference to the section, which doesn't contain the FieldDefinition)
this all is a part of moderator's interface, so i use authorization for all kinds of requests (get, post, patch, etc.)
Here is the code:
from tastypie_mongoengine.resources import MongoEngineResource
from tastypie.authentication import ApiKeyAuthentication
from apps.api.auth import CustomAuthorization
class FieldDefinitionResource(MongoEngineResource):
embedded_section = ReferenceField(attribute='embedded_section',
to='myproject.apps.api.resources.SectionResource',
full=True, null=True)
class Meta:
object_class = models.FieldDefinition # mongoengine EmbeddedDocument
authentication = ApiKeyAuthentication()
authorization = CustomAuthorization()
class SectionResource(MongoEngineResource):
fields = EmbeddedListField(attribute='fields',
of='myproject.apps.api.resources.FieldDefinitionResource',
full=True, null=True)
class Meta:
object_class = models.Section # mongoengine Document
authentication = ApiKeyAuthentication()
authorization = CustomAuthorization()
So, when i'm asking for a Section detail (e.g. /api/v1/section/524df40502c8f109b07ed6ae/), everything goes smooth, and fields attr is being displayed correctly in both cases of the presence and absence of embedded_section.
But an attempt to refer to a specific field (e.g. /api/v1/section/524df40502c8f109b07ed6ae/fields/0/) throws an error:
error_message: "'AnonymousUser' object has no attribute 'has_permission'"
has_permission is a method of MongoUser, which inherits from Django auth.User. In the first case described (Section detail) it does go through Authentication and fills request.user with a proper user object, while in the second case (Section field) it skips Authentication stage entirely, going straight to Authorization.
Am i doing something wrong?
Here is a full traceback:
{"error_message": "'AnonymousUser' object has no attribute 'has_permission'", "traceback": "Traceback (most recent call last):
File "/var/www/vhosts/myproject/local/lib/python2.7/site-packages/tastypie/resources.py", line 195, in wrapper
response = callback(request, *args, **kwargs)
File "/var/www/vhosts/myproject/local/lib/python2.7/site-packages/tastypie_mongoengine/resources.py", line 277, in dispatch_subresource
return resource.dispatch(request=request, **kwargs)
File "/vagrant/myproject/myproject/apps/api/resources.py", line 248, in dispatch
super(FieldDefinitionResource, self).dispatch(request_type, request, **kwargs)
File "/var/www/vhosts/myproject/local/lib/python2.7/site-packages/tastypie_mongoengine/resources.py", line 776, in dispatch
self.instance = self._safe_get(bundle, **kwargs)
File "/var/www/vhosts/myproject/local/lib/python2.7/site-packages/tastypie_mongoengine/resources.py", line 768, in _safe_get
return self.parent.cached_obj_get(bundle=bundle, **filters)
File "/var/www/vhosts/myproject/local/lib/python2.7/site-packages/tastypie/resources.py", line 1113, in cached_obj_get
cached_bundle = self.obj_get(bundle=bundle, **kwargs)
File "/var/www/vhosts/myproject/local/lib/python2.7/site-packages/tastypie_mongoengine/resources.py", line 528, in obj_get
return super(MongoEngineResource, self).obj_get(bundle=bundle, **kwargs)
File "/var/www/vhosts/myproject/local/lib/python2.7/site-packages/tastypie/resources.py", line 2069, in obj_get
self.authorized_read_detail(object_list, bundle)
File "/var/www/vhosts/myproject/local/lib/python2.7/site-packages/tastypie/resources.py", line 589, in authorized_read_detail
auth_result = self._meta.authorization.read_detail(object_list, bundle)
File "/vagrant/myproject/myproject/apps/api/auth.py", line 201, in read_detail
bundle.request.user.has_permission('read_detail',
File "/var/www/vhosts/myproject/local/lib/python2.7/site-packages/django/utils/functional.py", line 205, in inner
return func(self._wrapped, *args)
AttributeError: 'AnonymousUser' object has no attribute 'has_permission'
"}
It is a known issue in django-tastypie-mongoengine: see
https://github.com/wlanslovenija/django-tastypie-mongoengine/issues/71
https://github.com/wlanslovenija/django-tastypie-mongoengine/issues/72
and https://github.com/wlanslovenija/django-tastypie-mongoengine/issues/70
Those 3 issues are about the same problem:
The Authentication is being performed only before the action itself, but not before actions on a resource prior to the target action.
Example (using the code in my question): the target action update_detail of the instance of FieldDefinitionResource, which is a child of SectionResource. Prior to updating a detail of FieldDefinitionResource, there is a read_detail of SectionResource - and this is an action, for which django-tastypie-mongoengine skips the Authentication stage. It results in the absence of request.user, which in its turn prevents the work-flow from moving towards the target action (update_detail of the child resource).
This applies for EmbeddedDocumentField, EmbeddedListField, ReferencedListField and ReferenceField.
One possible workaround is to override the authorization for embedded / referenced document:
class CustomAuthorization(Authorization):
def read_detail(self, object_list, bundle):
# Double-check anonymous users, because operations
# on embedded fields do not pass through authentication.
if bundle.request.user.is_anonymous():
MyAuthentication().is_authenticated(bundle.request)
# Now authorize.
try:
return bundle.request.user.has_permission(object_list, 'read_detail')
except AttributeError:
raise Unauthorized(_('You have to authenticate first!'))
But of course, it would be nice to have it solved in the future releases.
I am trying to create a REST API with Neo4j and Django in the backend.
The problem is that even when I have Django models using Neo4Django , I can't use frameworks like Tastypie or Piston that normally serialize models into JSON (or XML).
Sorry if my question is confusing or not clear, I am newbie to webservices.
Thanks for you help
EDIT: So I started with Tastypie and followed the tutorial on this page http://django-tastypie.readthedocs.org/en/latest/tutorial.html. I am looking for displaying the Neo4j JSON response in the browser, but when I try to access to http://127.0.0.1:8000/api/node/?format=json I get this error instead:
{"error_message": "'NoneType' object is not callable", "traceback": "Traceback (most recent call last):\n\n File \"/usr/local/lib/python2.6/dist-packages/tastypie/resources.py\", line 217, in wrapper\n response = callback(request, *args, **kwargs)\n\n File \"/usr/local/lib/python2.6/dist-packages/tastypie/resources.py\", line 459, in dispatch_list\n return self.dispatch('list', request, **kwargs)\n\n File \"/usr/local/lib/python2.6/dist-packages/tastypie/resources.py\", line 491, in dispatch\n response = method(request, **kwargs)\n\n File \"/usr/local/lib/python2.6/dist-packages/tastypie/resources.py\", line 1298, in get_list\n base_bundle = self.build_bundle(request=request)\n\n File \"/usr/local/lib/python2.6/dist-packages/tastypie/resources.py\", line 718, in build_bundle\n obj = self._meta.object_class()\n\nTypeError: 'NoneType' object is not callable\n"}
Here is my code :
api.py file:
class NodeResource (ModelResource): #it doesn't work with Resource neither
class meta:
queryset= Node.objects.all()
resource_name = 'node'
urls.py file:
node_resource= NodeResource()
urlpatterns = patterns('',
url(r'^api/', include(node_resource.urls)),
models.py file :
class Node(models.NodeModel):
p1 = models.StringProperty()
p2 = models.StringProperty()
I would advise steering away from passing Neo4j REST API responses directly through your application. Not only would you not be in control of the structure of these data formats as they evolve and deprecate (which they do) but you would be exposing unnecessary internals of your database layer.
Besides Neo4Django, you have a couple of other options you might want to consider. Neomodel is another model layer designed for Django and intended to act like the built-in ORM; you also have the option of the raw OGM layer provided by py2neo which may help but isn't Django-specific.
It's worth remembering that Django and its plug-ins have been designed around a traditional RDBMS, not a graph database, so none of these solutions will be perfect. Whatever you choose, you're likely to have to carry out a fair amount of transformation work to create your application's API.
Django-Tastypie allows to create REST APIs with NoSQL databases as well as mentioned in http://django-tastypie.readthedocs.org/en/latest/non_orm_data_sources.html.
The principle is to use tastypie.resources.Resource and not tastypie.resources.ModelResource which is SPECIFIC to RDBMS, then main functions must be redefined in order to provide a JSON with the desired parameters.
So I took the example given in the link, modified it and used Neo4j REST Client for Python to get an instance of the db and perform requests, and it worked like a charm.
Thanks for all your responses :)
Thanks to recent contributions, Neo4django now supports Tastypie out of the box! I'd love to know what you think if you try it out.
EDIT:
I've just run through the tastypie tutorial, and posted a gist with the resulting example. I noticed nested resources are a little funny, but otherwise it works great. I'm pretty sure the gents who contributed the patches enabling this support also know how to take care of nested resources- I'll ask them to speak up.
EDIT:
As long as relationships are specified in the ModelResource, they work great. If anyone would like to see examples, let me know.
Well my answer was a bit vague so I'm gonna post how a solved the problem with some code:
Assume that I want to create an airport resource with some attributes. I will structure this in 3 different files (for readability reasons).
First : airport.py
This file will contain all the resource attributes and a constructor too :
from models import *
class Airport(object):
def __init__ (self, iata, icao, name, asciiName, geonamesId, wikipedia, id, latitude, longitude):
self.icao = icao
self.iata = iata
self.name = name
self.geonamesId = geonamesId
self.wikipedia = wikipedia
self.id = id
self.latitude = latitude
self.longitude = longitude
self.asciiName = asciiName
This file will be used in order to create resources.
Then the second file : AirportResource.py:
This file will contain the resource attributes and some basic methods depending on which request we want our resource to handle.
class AirportResource(Resource):
iata = fields.CharField(attribute='iata')
icao = fields.CharField(attribute='icao')
name = fields.CharField(attribute='name')
asciiName = fields.CharField(attribute='asciiName')
latitude = fields.FloatField(attribute='latitude')
longitude = fields.FloatField(attribute='longitude')
wikipedia= fields.CharField(attribute='wikipedia')
geonamesId= fields.IntegerField(attribute='geonamesId')
class Meta:
resource_name = 'airport'
object_class = Airport
allowed_methods=['get', 'put']
collection_name = 'airports'
detail_uri_name = 'id'
def detail_uri_kwargs(self, bundle_or_obj):
kwargs = {}
if isinstance(bundle_or_obj, Bundle):
kwargs['id'] = bundle_or_obj.obj.id
else:
kwargs['id'] = bundle_or_obj.id
return kwargs
As mentioned in the docs, if we want to create an API that handle CREATE, GET, PUT, POST and DELETE requests, we must override/implement the following methods :
def obj_get_list(self, bundle, **kwargs) : to GET a list of objects
def obj_get(self, bundle, **kwargs) : to GET an individual object
def obj_create(self, bundle, **kwargs) to create an object (CREATE method)
def obj_update(self, bundle, **kwargs) to update an object (PUT method)
def obj_delete(self, bundle, **kwargs) to delete an object (DELETE method)
(see http://django-tastypie.readthedocs.org/en/latest/non_orm_data_sources.html)
Normally, in ModelResource all those methods are defined and implemented, so they can be used directly without any difficulty. But in this case, they should be customized according to what we want to do.
Let's see an example of implementing obj_get_list and obj_get :
For obj_get_list:
In ModelResource, the data is FIRSTLY fetched from the database, then it could be FILTERED according to the filter declared in META class ( see http://django-tastypie.readthedocs.org/en/latest/interacting.html). But I didn't wish to implement such behavior (get everything then filter), so I made a query to Neo4j given the query string parameters:
def obj_get_list(self,bundle, **kwargs):
data=[]
params= []
for key in bundle.request.GET.iterkeys():
params.append(key)
if "search" in params :
query= bundle.request.GET['search']
try:
results = manager.searchAirport(query)
data = createAirportResources(results)
except Exception as e:
raise NotFound(e)
else:
raise BadRequest("Non valid URL")
return data
and for obj_get:
def obj_get(self, bundle, **kwargs):
id= kwargs['id']
try :
airportNode = manager.getAirportNode(id)
airport = createAirportResources([airportNode])
return airport[0]
except Exception as e :
raise NotFound(e)
and finally a generic function that takes as parameter a list of nodes and returns a list of Airport objects:
def createAirportResources(nodes):
data= []
for node in nodes:
iata = node.properties['iata']
icao = node.properties['icao']
name = node.properties['name']
asciiName = node.properties['asciiName']
geonamesId = node.properties['geonamesId']
wikipedia = node.properties['wikipedia']
id = node.id
latitude = node.properties['latitude']
longitude = node.properties['longitude']
airport = Airport(iata, icao, name, asciiName, geonamesId, wikipedia, id, latitude, longitude)
data.append(airport)
return data
Now the third manager.py : which is in charge of making queries to the database and returning results :
First of all, I get an instance of the database using neo4j rest client framework :
from neo4jrestclient.client import *
gdb= GraphDatabase("http://localhost:7474/db/data/")
then the function which gets an airport node :
def getAirportNode(id):
if(getNodeType(id) == type):
n= gdb.nodes.get(id)
return n
else:
raise Exception("This airport doesn't exist in the database")
and the one to perform search (I am using a server plugin, see Neo4j docs for more details):
def searchAirport(query):
airports= gdb.extensions.Search.search(query=query.strip(), searchType='airports', max=6)
if len(airports) == 0:
raise Exception('No airports match your query')
else:
return results
Hope this will help :)
I have a ModelForm which is not working as expected. The method is_valid() returns True even for empty fields and moreover in the clenead_data I don't have the expected fields, but only a field which should not be there (since is not rendered by the form).
My scenario is something like this:
my form class:
class MyForm(ModelForm):
class Meta:
model = MyModel
# fields = ('one', 'two', 'three')
widgets = {
'fieldA': SelectDateWidget(),
'fieldB': forms.HiddenInput(),
# ...
}
fieldX = forms.ChoiceField(widget=forms.RadioSelect(),
choices=(...),
initial=A_VALUE)
fieldY = forms.ChoiceField(widget=forms.RadioSelect(),
choices=(...),
initial=A_VALUE)
the form is rendered in the page as expected and submitted using POST (all the data is submitted correctly). Then in my controller i have something like:
self.form = MyForm(request.POST)
and self.form.cleaned_data has only one field inside (it's a field belonging to the model but unexpected in the form) before invoking is_valid() and after too.
I also tried to declare specific "fields" providing the tuple in the Meta class and viceversa specifying undesired ones using "exclude" with no luck.
I know, this is very vague... but could you give me some suggestions?
ps. the same approach with ModelForm works perfectly in other section of my project :P
...moreover if I open the interactive shell (python manage.py shell) and I try the following:
f = MyForm({})
f.is_valid()
I get the following exception:
Traceback (most recent call last):
File "<console>", line 1, in <module>
File "/Users/davidezanotti/MyPythonEnv/lib/python2.7/site-packages/django/forms/forms.py", line 126, in is_valid
return self.is_bound and not bool(self.errors)
File "/Users/davidezanotti/MyPythonEnv/lib/python2.7/site-packages/django/forms/forms.py", line 117, in _get_errors
self.full_clean()
File "/Users/davidezanotti/MyPythonEnv/lib/python2.7/site-packages/django/forms/forms.py", line 272, in full_clean
self._clean_fields()
File "/Users/davidezanotti/MyPythonEnv/lib/python2.7/site-packages/django/forms/forms.py", line 290, in _clean_fields
value = getattr(self, 'clean_%s' % name)()
TypeError: 'NoneType' object is not callable
Fuuuuuuuuu!!!! O___O'
After 3 hours I realized that the problem was in the form's superclass! I have my own ModelForm which extends django's ModelForm in order to provide dynamic methods to render forms using Bootstrap templates (http://twitter.github.io/bootstrap/base-css.html#forms).
So in my custom model I have a allFieldsGroupedInDivs method which is similar to "as_table" but use divs with specific classes to display data... and in order to provide more flexibility for complex form (where I have several fields and I want to order them in particular way) I have recently implemented a magic method (__getattr__) in order to render a single form field using the signature thefieldGroupedInDivs (where "thefield" is the name of the field to render). The problem is that Django uses that magic method in order to dynamically create the various clean_field() so my data was not cleaned properly! I solved simply by invoking the super implementation when the requested method is not in the form *GroupedInDivs :)
In conclusion: PAY ATTENTION WHEN OVERRIDING DJANGO'S CLASSES!
I want to incorporate a FormWizard to handle a long form. After researching, it seems that django-merlin is the best option since it manages the formwizard via sessions. Trying to incorporate it (as mentioned in the django wizard docs), however, results in an AttributeError: type object 'CreateWizard' has no attribute 'as_view'.
Here is what it looks like:
from merlin.wizards.session import SessionWizard
class StepOneForm(forms.Form):
year = forms.ChoiceField(choices=YEAR_CHOICES)
...
class StepTwoForm(forms.Form):
main_image = forms.ImageField()
...
class StepThreeForm(forms.Form):
condition = forms.ChoiceField(choices=CONDITION)
...
class CreateWizard(SessionWizard):
def done(self, form_list, **kwargs):
return HttpResponseRedirect(reverse('wizard-done'))
url:
url(r'^wizard/(?P<slug>[A-Za-z0-9_-]+)/$', CreateWizard.as_view([StepOneForm, StepTwoForm, StepThreeForm])),
Since the merlin docs are a little sparse, I chose to use the as_view() method as described in the original django form wizard docs, but it results in an AttributeError. How should I incorporate the merlin wizard in my urlconf? Thanks for your ideas!
This is the error and traceback that I get after updating based on #mVChr's answer and defining steps like this:
step_one = Step('step_one', StepOneForm())
Error and Traceback:
TypeError at / issubclass() arg 1 must be a class
Traceback:
File /lib/python2.7/django/core/handlers/base.py" in get_response
89. response = middleware_method(request)
File "/lib/python2.7/django/utils/importlib.py" in import_module
35. __import__(name)
File "/myproject/myproject/urls.py" in <module>
7. from myapp.forms import step_one, step_two, step_three, CreateWizard
File "/myproject/myapp/forms.py" in <module>
16. step_one = Step('step_one', StepOneForm())
File "/lib/python2.7/merlin/wizards/utils.py" in __init__
36. if not issubclass(form, (forms.Form, forms.ModelForm,)):
Exception Type: TypeError at /
Exception Value: issubclass() arg 1 must be a class
Although Im still getting an error, I feel closer to the solution thanks to #mVChr. Any ideas on how to solve this error are greatly appreciated! Thanks for any ideas!
Note: I do not know if this will work, I am just trying to help Nick B translate the docs with a specific example to get him closer to the proper solution. Please let me know if this works as-is and I will remove this comment.
From reading the docs it looks like you need to pass a list of Step objects directly to your SessionWizard subclass instantiation, as follows:
from merlin.wizards.session import SessionWizard
from merlin.wizards.utils import Step
class StepOneForm(forms.Form):
year = forms.ChoiceField(choices=YEAR_CHOICES)
...
step_one = Step('step-one', StepOneForm())
class StepTwoForm(forms.Form):
main_image = forms.ImageField()
...
step_two = Step('step-two', StepTwoForm())
class StepThreeForm(forms.Form):
condition = forms.ChoiceField(choices=CONDITION)
...
step_three = Step('step-three', StepThreeForm())
class CreateWizard(SessionWizard):
def done(self, form_list, **kwargs):
return HttpResponseRedirect(reverse('wizard-done'))
And then in your urls.py:
url(r'^wizard/(?P<slug>[A-Za-z0-9_-]+)/$',
CreateWizard([step_one, step_two, step_three]))
Want to draw your attention that you use wrong syntax while making an object of Step.
This
step_one = Step('step-one', StepOneForm())
should be like
step_one = Step('step-one', StepOneForm)
You have to correct it in all step object.
UPDATE: I ended up creating a new forms.Form instead of using a ModelForm
In a ModelForm, I replaced a field by excluding it and adding a new one
with the same name, as shown below in AddRestaurantForm. When saving
the form with the code shown below, I get an error in form.save_m2m()
("Truncated incorrect DOUBLE value"), which seems to be due to the
function to attempt to save the tag field, while it is excluded.
Is the save_m2m() function supposed to save excluded fields?
Is there anything wrong in my code?
Thanks
Jul
(...)
new_restaurant = form.save(commit=False)
new_restaurant.city = city
new_restaurant.save()
tags = form.cleaned_data['tag']
if(tags!=''): tags=tags.split(',')
for t in tags:
tag, created = Tag.objects.get_or_create(name = t.strip())
tag.save()
new_restaurant.tag.add(tag)
new_restaurant.save()
form.save_m2m()
models.py
class Tag(models.Model):
name = models.CharField(max_length=100, unique=True)
class Restaurant(models.Model):
name = models.CharField(max_length=50)
city=models.ForeignKey(City)
category=models.ManyToManyField(Category)
tag=models.ManyToManyField(Tag, blank=True, null=True)
forms.py
class AddRestaurantForm(ModelForm):
name = forms.CharField(widget=forms.TextInput(attrs=classtext))
city = forms.CharField(widget=forms.TextInput(attrs=classtext), max_length=100)
tag = forms.CharField(widget=forms.TextInput(attrs=classtext), required=False)
class Meta:
model = Restaurant
exclude = ('city','tag')
Traceback:
File "/var/lib/python-support/python2.5/django/core/handlers/base.py"
in get_response
92. response = callback(request, *callback_args,
**callback_kwargs) File "/home/jul/atable/../atable/resto/views.py" in addRestaurant
498. form.save_m2m() File "/var/lib/python-support/python2.5/django/forms/models.py" in
save_m2m
75. f.save_form_data(instance, cleaned_data[f.name]) File "/var/lib/python-support/python2.5/django/db/models/fields/
related.py" in save_form_data
967. setattr(instance, self.attname, data) File "/var/lib/python-support/python2.5/django/db/models/fields/
related.py" in set
627. manager.add(*value) File "/var/lib/python-support/python2.5/django/db/models/fields/
related.py" in add
430. self._add_items(self.source_col_name, self.target_col_name, *objs) File
"/var/lib/python-support/python2.5/django/db/models/fields/
related.py" in _add_items
497. [self._pk_val] + list(new_ids)) File "/var/lib/python-support/python2.5/django/db/backends/util.py" in
execute
19. return self.cursor.execute(sql, params) File "/var/lib/python-support/python2.5/django/db/backends/mysql/
base.py" in execute
84. return self.cursor.execute(query, args) File "/var/lib/python-support/python2.5/MySQLdb/cursors.py" in execute
168. if not self._defer_warnings: self._warning_check() File "/var/lib/python-support/python2.5/MySQLdb/cursors.py" in
_warning_check
82. warn(w[-1], self.Warning, 3) File "/usr/lib/python2.5/warnings.py" in warn
62. globals) File "/usr/lib/python2.5/warnings.py" in warn_explicit
102. raise message
Exception Type: Warning at /restaurant/add/ Exception Value:
Truncated incorrect DOUBLE value: 'a'
I see you also posted this same question to Django-users. I'll copy the answer I've posted there:
Firstly, it is no use just giving the name of the error. Errors come
with tracebacks, for good reason: they allow us to see exactly where
the error is occurring, and the context.
Anyway, in your case, there doesn't seem to be any need to use
save_m2m. The documentation states:
"Calling save_m2m() is only required if you use save(commit=False)"
In your case, you've already saved the form to get the new_restaurant
instance, and you're adding tags to that instance with no problem. The
last two calls, to new_restaurant.save() and form.save_m2m(), are unnecessary.
You don't need either of the last two "save" calls. Your tags relation will be implicitly saved by virtue of the add(). I'd just drop those from the code.