subject:"Matching query does not exist after a post_data signal, but in fact does exist when visiting the url sent by the query"

Re: Matching query does not exist after a post_data signal, but in fact does exist when visiting the url sent by the query

2017-05-17 Thread Constantine Covtushenko

Hi, François-Xavier

I believe that the reason of that is a transaction that is not committed
yet  when your code reaches 'post_save' listener.
And when you use 'requests' library there is nothing in the DB yet.

And I am just curios why there is a need of saving 'admin view' in the DB?

Regards,
Constantine C.

On Tue, May 16, 2017 at 10:17 PM, François-Xavier Cao 
wrote:

> Hi everone,
>
>
> I started to code a two-apps django project. ModelA belongs to appone and
> ModelB belongs to apptwo. My purpose is to create a ModelA instance
> everytime that the user creates a ModelB instance. And the value of a
> ModelA CharField (that is ckeditor widgeted) must be the source code of a
> ModelB admin view. I used a post_data signal to link a function of creation
> for that. The problem is that i use the id of each instance of ModelB in
> order to create the good content for each instance of ModelA. When I try to
> use a string of the url sending the id parameter, the content field has for
> value the source code of the debug page
>
> (error 500, DoesNotExist at /admin/apptwo/modelb/my_view/ref=76, [76 is
> an example] ModelB matching query does not exist. Exception location :
> /home/me/Desktop/env/lib/python3.5/site-packages/django/db/models/query.py
> in get, line 385)
>
> But when I try to visit the url "http://localhost:8000//admin/
> apptwo/modelb/my_view/ref=76", or when I hardcode the url, without a str(
> instance.id), the page exists and everything works perfectly.
>
> I don't understand why.
>
> Could anybody give me some help to solve this problem ?
>
> Thanks in advance,
>
> --
>
> PS :
>
> The first app has a model.py that contains the following code :
>
>
> from django.db import models
> from django.contrib.auth.models import Userfrom registre.models import *
> class ModelA(models.Model):
> content = models.CharField(max_length=255, null=True)
> def __str__(self):
> return "ModelA : " + str(self.id)
>
>
>
>
> the admin.py of this first app also contains :
>
>
> from django.contrib import admin
> from appone.models import *
> from apptwo.models import ModelB
> from django.http import HttpResponse
> from django.template.response import TemplateResponse
> from django.conf.urls import url
> from registre import views
> from django.db.models.signals import post_save
> from django.dispatch import receiver
> import datetime
> from django.contrib.auth.models import User
> from django import forms
> from ckeditor.widgets import CKEditorWidget
> from django.template.loader import render_to_string
> import requests
>
> class ModelAAdminForm(forms.ModelForm):
> content = forms.CharField(widget=CKEditorWidget())
> class Meta:
> model = ModelA
> fields = '__all__'
>
> class ModelAAdmin(admin.ModelAdmin):
> form = ModelAAdminForm
>
> def create_A(sender, instance, **kwargs):
> string = "http://localhost:8000/admin/apptwo/modelb/my_view/ref=; + 
> str(instance.id)
> r = requests.get(string)
> ModelA.objects.create(contenu=r.text.encode('utf-8'))
>
> post_save.connect(create_A, sender=ModelB)
>
> admin.site.register(ModelA, ModelAAdmin)
>
>
>
>
>
> the second app (apptwo) has a models.py like this :
>
>
>
> from django.db import models
> from django.contrib.auth.models import User
>
> class ModelB(models.Model):
> owner = models.ForeignKey(User, null=True)
> name = models.CharField(max_length=255, null=True)
>
> def __str__(self):
> return self.name
>
>
>
>
> and an admin.py that contains :
>
>
>
> from django.contrib import admin
> from appone.models import *
> from apptwo.models import *
> import datetime
> from django.conf.urls import url, include
> from django.template.response import TemplateResponse
>
> class ModelBAdmin(admin.ModelAdmin):
>
> def get_queryset(self, request):
> qs = super(ModelB, self).get_queryset(request)
> if request.user.is_superuser:
> return qs
> return qs.filter(owner=request.user)
>
> def save_model(self, request, obj, form, change):
> obj.owner = request.user
> obj.save()
>
> def get_urls(self):
> urls = super(ModelBAdmin, self).get_urls()
> my_urls = [
> url(r'^my_view/ref=(?P\d+)$', self.my_view),
> ]
> return my_urls + urls
>
> def my_view(self, request, id):
> context = dict(
>self.admin_site.each_context(request),
>selector = ModelB.objects.get(id=id),
> )
> return TemplateResponse(request, "myview.html", context)
>
> admin.site.register(ModelB, ModelBAdmin)
>
>
>
>
>
>
>
> and finally a template myview.html with :
>
>
> Test {{ selector.name }}
>
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> To unsubscribe from this group and stop

Matching query does not exist after a post_data signal, but in fact does exist when visiting the url sent by the query

2017-05-16 Thread François-Xavier Cao

 

Hi everone, 


I started to code a two-apps django project. ModelA belongs to appone and 
ModelB belongs to apptwo. My purpose is to create a ModelA instance 
everytime that the user creates a ModelB instance. And the value of a 
ModelA CharField (that is ckeditor widgeted) must be the source code of a 
ModelB admin view. I used a post_data signal to link a function of creation 
for that. The problem is that i use the id of each instance of ModelB in 
order to create the good content for each instance of ModelA. When I try to 
use a string of the url sending the id parameter, the content field has for 
value the source code of the debug page 

(error 500, DoesNotExist at /admin/apptwo/modelb/my_view/ref=76, [76 is an 
example] ModelB matching query does not exist. Exception location : 
/home/me/Desktop/env/lib/python3.5/site-packages/django/db/models/query.py 
in get, line 385)

But when I try to visit the url "
http://localhost:8000//admin/apptwo/modelb/my_view/ref=76;, or when I 
hardcode the url, without a str(instance.id), the page exists and 
everything works perfectly.

I don't understand why. 

Could anybody give me some help to solve this problem ?

Thanks in advance,

--

PS : 

The first app has a model.py that contains the following code : 


from django.db import models
from django.contrib.auth.models import Userfrom registre.models import *
class ModelA(models.Model):
content = models.CharField(max_length=255, null=True)
def __str__(self):
return "ModelA : " + str(self.id)




the admin.py of this first app also contains : 


from django.contrib import admin
from appone.models import *
from apptwo.models import ModelB
from django.http import HttpResponse
from django.template.response import TemplateResponse
from django.conf.urls import url
from registre import views
from django.db.models.signals import post_save
from django.dispatch import receiver
import datetime
from django.contrib.auth.models import User
from django import forms
from ckeditor.widgets import CKEditorWidget
from django.template.loader import render_to_string
import requests

class ModelAAdminForm(forms.ModelForm):
content = forms.CharField(widget=CKEditorWidget())
class Meta:
model = ModelA
fields = '__all__'

class ModelAAdmin(admin.ModelAdmin):
form = ModelAAdminForm

def create_A(sender, instance, **kwargs):
string = "http://localhost:8000/admin/apptwo/modelb/my_view/ref=; + 
str(instance.id)
r = requests.get(string)
ModelA.objects.create(contenu=r.text.encode('utf-8'))

post_save.connect(create_A, sender=ModelB) 

admin.site.register(ModelA, ModelAAdmin)





the second app (apptwo) has a models.py like this : 



from django.db import models
from django.contrib.auth.models import User

class ModelB(models.Model):
owner = models.ForeignKey(User, null=True)
name = models.CharField(max_length=255, null=True)

def __str__(self):
return self.name




and an admin.py that contains : 



from django.contrib import admin
from appone.models import *
from apptwo.models import *
import datetime
from django.conf.urls import url, include
from django.template.response import TemplateResponse

class ModelBAdmin(admin.ModelAdmin):

def get_queryset(self, request):
qs = super(ModelB, self).get_queryset(request)
if request.user.is_superuser:
return qs
return qs.filter(owner=request.user)

def save_model(self, request, obj, form, change):
obj.owner = request.user
obj.save()

def get_urls(self):
urls = super(ModelBAdmin, self).get_urls()
my_urls = [
url(r'^my_view/ref=(?P\d+)$', self.my_view),
]
return my_urls + urls

def my_view(self, request, id):
context = dict(
   self.admin_site.each_context(request),
   selector = ModelB.objects.get(id=id),
)
return TemplateResponse(request, "myview.html", context)

admin.site.register(ModelB, ModelBAdmin)







and finally a template myview.html with : 


Test {{ selector.name }}

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Re: Matching query does not exist after a post_data signal, but in fact does exist when visiting the url sent by the query

Matching query does not exist after a post_data signal, but in fact does exist when visiting the url sent by the query

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