I am having some issues trying to update some records in Django: When i try to update some record, the app insert a new one, I don't know why i have this behavior.
Model
class DetalleRecepcion(models.Model):
id_proveedor = models.ForeignKey(Proveedor,db_column='id_proveedor',primary_key=True, verbose_name='Proveedor')
anio = models.IntegerField( null=False)
mes = models.IntegerField(verbose_name='Mes')
fecha_recepcion = models.DateField(verbose_name='Fecha Recepcion')
usuario = models.CharField(max_length=15, blank=True)
num_archivos = models.IntegerField(primary_key=True, verbose_name='No de archivos')
class Meta:
managed = False
db_table = 'mpc_detalle_recepcion'
view:
@login_required(login_url='/login/')
def DetRecView(request):
idp = request.GET.get('i')
anio = request.GET.get('a')
mes = request.GET.get('m')
if request.method == 'POST':
r = DetalleRecepcion.objects.get(id_proveedor=idp,anio=anio,mes=mes)
form = DetRecForm(request.POST or None, instance =r)
if form.is_valid():
form.save()
return HttpResponse('<script type="text/javascript">window.close()</script>')
else:
r = DetalleRecepcion.objects.get(id_proveedor=idp,anio=anio,mes=mes)
r.usuario = request.user
form = DetRecForm(instance=r)
return render_to_response('detrec.html',
{'form':form},
context_instance=RequestContext(request))
Form:
class DetRecForm(forms.ModelForm):
fecha_recepcion = forms.DateField(widget=DateInput(),)
def __init__(self,*args,**kwargs):
super(DetRecForm,self).__init__(*args,**kwargs)
self.helper = FormHelper(self)
self.helper.layout = Layout(
Field('id_proveedor',
'anio',
'mes',
'usuario',
readonly = True
),
Fieldset('',
'fecha_recepcion',
'num_archivos',
Submit('save','Grabar'),
HTML('<a class="btn btn-danger" id="cerrar">Cancelar</a>')
)
)
class Meta:
model = DetalleRecepcion
I use the same view and form definition for others models to render edit forms and with this other models works great and the records are updated. I don't understand what it's happen. I rewrite the form, view definition for this model and I don't know what it is the problem. The database is a legacy database and the tables doesn't have any kind of relationship or constraint. By the way I am using Django crispy form
Thanks in advance
If you using same form for create and update views, then you need provide clean method on your unique field and raise ValidationError when object exists.
But in your case, I assuming you using Composite Primary Key on fields: id_proveedor, num_archivos, you should override clean method of the whole form:
class DetRecForm(forms.ModelForm):
fecha_recepcion = forms.DateField(widget=DateInput())
def __init__(self, *args, **kwargs):
super(DetRecForm, self).__init__(*args, **kwargs)
self.helper = FormHelper(self)
self.helper.layout = Layout(
Field('id_proveedor',
'anio',
'mes',
'usuario',
readonly=True
),
Fieldset('',
'fecha_recepcion',
'num_archivos',
Submit('save', 'Grabar'),
HTML('<a class="btn btn-danger" id="cerrar">Cancelar</a>')
)
)
def clean(self):
cleaned_data = super(DetRecForm, self).clean()
id_proveedor = self.cleaned_data['id_proveedor']
num_archivos = self.cleaned_data['num_archivos']
qs = self.Meta.model.objects.filter(id_proveedor=id_proveedor, num_archivos=num_archivos)
if self.instance:
qs = qs.exclude(pk=self.instance.id)
if qs.count() > 0:
raise forms.ValidationError(u'Such object exists!')
return cleaned_data
class Meta:
model = DetalleRecepcion
尝试例如通过pk获取对象
DetalleRecepcion.objects.get(pk=kwargs['pk'])
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