I have a model :
class Certificate(models.Model):
comments = models.TextField(blank=True, default='')
generic_certificate = models.ForeignKey(GenericCertificate, related_name='certificates_awarded')
tag = models.ForeignKey('Tag', related_name='certificates_awarded', null=True, blank=True)
created_at = models.DateTimeField(auto_now_add=True)
history_timestamp = models.DateTimeField(auto_now=True)
rewardee = models.ForeignKey(OrganisationUser, related_name='certificates_rewarded')
position = models.CharField(max_length=50, default = '0,0')
I want to save position fields given primary-key.
Here is views.py :
def post(self, request , *args , **kwargs):
comments = Certificate.objects.values("comments").filter(pk = kwargs.get('cert_id') )
gen_certi = Certificate.objects.values("generic_certificate").filter(pk = kwargs.get('cert_id') )
tag = Certificate.objects.values("tag").filter(pk = kwargs.get('cert_id') )
history_timestamp = Certificate.objects.values("history_timestamp").filter(pk = kwargs.get('cert_id') )
rewardee = Certificate.objects.values("rewardee").filter(pk = kwargs.get('cert_id') )
position = request.POST.get('hid')
position = str([position])
a = Certificate.objects.create( comments=comments, generic_certificate = gen_certi , tag=tag,rewardee=rewardee, position=position )
print a
Its giving error :
Exception Value:
Cannot assign "[{'generic_certificate': 2}]": "Certificate.generic_certificate" must be a "GenericCertificate" instance.
Please help how to save position field into database.
gen_certi variable is a queryset (list of objects), because you are using filter() - use get() instead:
gen_certi = Certificate.objects.get(pk = kwargs.get('cert_id')).generic_certificate
Actually, I don't understand what are you planning to do in the view. If you are modifying the object, there is no need to overwrite the existing fields, just update the fields that are passed to the view in request.POST, like position:
try:
certificate = Certificate.objects.get(pk = kwargs.get('cert_id'))
certificate.position = request.POST.get('hid')
certificate.save()
except DoesNotExist:
# create new certificate
certificate = Certificate()
...
Hope that helps.
Related
hi i have a problem with this filter. group_to_add takes some values which should filter out the problem that I don't want those values but I want the others without those.
I would like to find a way to take those values and subtract them from others.
group_to_add = DatiGruppi.objects.filter(gruppi_scheda = scheda.id)
GruppiForm.base_fields['dati_gruppo'] = forms.ModelChoiceField(queryset = group_to_add)
I asked a similar question I leave the link
select filtering and removal if they are already present in the db
models
class Schede(models.Model):
nome_scheda = models.CharField(max_length=100)
utente = models.ForeignKey(User, on_delete = models.CASCADE,related_name = 'utente')
class DatiGruppi(models.Model):
dati_gruppo = models.ForeignKey(Gruppi,on_delete = models.CASCADE, related_name = 'dati_gruppo')
gruppi_scheda = models.ForeignKey(Schede,on_delete = models.CASCADE, related_name = 'gruppi_scheda')
class Gruppi(models.Model):
nome_gruppo = models.CharField(max_length=100)
I have this tab where inside there are saved data groups that contain groups that are inside a select the correct exclusion would be
group_to_add = Gruppi.objects.exclude(dati_gruppo = 147)
but instead of 147 I have to put the id of the data group of that board
view
def creazione(request, nome):
scheda = get_object_or_404(Schede, nome_scheda = nome)
eserciziFormSet = formset_factory(EserciziForm, extra = 0)
if request.method == "POST":
gruppo_form = GruppiForm(request.POST, prefix = 'gruppo')
if gruppo_form.is_valid():
gruppo = gruppo_form.save(commit = False)
gruppo.gruppi_scheda = scheda
gruppoName = gruppo_form.cleaned_data['dati_gruppo']
gruppo.save()
esercizi_formset = eserciziFormSet(request.POST, prefix='esercizi')
for esercizi in esercizi_formset:
esercizi_instance = esercizi.save(commit = False)
esercizi_instance.gruppo_single = get_object_or_404(DatiGruppi, gruppi_scheda = scheda.id, dati_gruppo = gruppoName)
esercizi_instance.save()
return HttpResponseRedirect(request.path_info)
else:
group_to_add = Gruppi.objects.exclude(dati_gruppo = 147)
GruppiForm.base_fields['dati_gruppo'] = forms.ModelChoiceField(queryset = group_to_add)
gruppo_form = GruppiForm(prefix = 'gruppo')
esercizi_formset = eserciziFormSet(prefix='esercizi')
context = {'scheda' : scheda, 'gruppo_form' : gruppo_form, 'esercizi_formset': esercizi_formset}
return render(request, 'crea/passo2.html', context)
If I understand it correctly, you should use .exclude(…) [Django-doc] not .filter(…) [Django-doc]:
group_to_add = Gruppi.objects.exclude(
dati_gruppo__gruppi_scheda=scheda
)
GruppiForm.base_fields['dati_gruppo'] = forms.ModelChoiceField(queryset=group_to_add)
look at the picture before answering me.
that group2 is inside saved in the db with the button I open a modal that allows me to save other groups in the db and I would like that the same groups no longer appear in that select if I have already added them
form.py
class EserciziForm(forms.ModelForm):
class Meta:
model = models.DatiEsercizi
exclude = ['gruppo_single']
#fields = '__all__'
class GruppiForm(forms.ModelForm):
class Meta:
model = models.DatiGruppi
exclude = ['gruppi_scheda']
views.py
def creazione(request, nome):
scheda = get_object_or_404(Schede, nome_scheda = nome)
eserciziFormSet = formset_factory(EserciziForm, extra = 0)
if request.method == "POST":
gruppo_form = GruppiForm(request.POST, prefix = 'gruppo')
if gruppo_form.is_valid():
gruppo = gruppo_form.save(commit = False)
gruppo.gruppi_scheda = scheda
gruppoName = gruppo_form.cleaned_data['dati_gruppo']
gruppo.save()
esercizi_formset = eserciziFormSet(request.POST, prefix='esercizi')
for esercizi in esercizi_formset:
esercizi_instance = esercizi.save(commit = False)
esercizi_instance.gruppo_single = get_object_or_404(DatiGruppi, gruppi_scheda = scheda.id, dati_gruppo = gruppoName)
esercizi_instance.save()
return HttpResponseRedirect(request.path_info)
else:
gruppo_form = GruppiForm(prefix = 'gruppo')
esercizi_formset = eserciziFormSet(prefix='esercizi')
context = {'scheda' : scheda, 'gruppo_form' : gruppo_form, 'esercizi_formset': esercizi_formset}
return render(request, 'crea/passo2.html', context
models.py
class DatiGruppi(models.Model):
giorni_settimana_scelta = [
("LUNEDI","Lunedì"),
("MARTEDI","Martedì"),
("MERCOLEDI","Mercoledì"),
("GIOVEDI","Giovedì"),
("VENERDI","Venerdì"),
("SABATO","Sabato"),
("DOMENICA","Domenica")
]
giorni_settimana = MultiSelectField(choices = giorni_settimana_scelta,default = '-')
dati_gruppo = models.ForeignKey(
Gruppi,on_delete = models.CASCADE, related_name = 'dati_gruppo')
gruppi_scheda = models.ForeignKey(Schede,on_delete = models.CASCADE, related_name = 'gruppi_scheda')
class Schede(models.Model):
nome_scheda = models.CharField(max_length=100)
data_inizio = models.DateField()
data_fine = models.DateField()
utente = models.ForeignKey(User, on_delete = models.CASCADE,related_name = 'utente')
You can override a form field before instantiate it like this :
views.py
from django import forms
if request.method == "POST":
# Post logic here
else:
# We try to retrieve group that the current user is not yet in.
# Not your logic, but to sum up, you have to retrieve the groups
# which had not yet been added.
# Use a filter that permit you to retrieve only groups which had not yet been added.
group_to_add = Group.objects.filter(...)
GruppiForm.base_fields['group_field'] = forms.ModelChoiceField(
queryset=group_to_add)
# Instantiate the form now
# In this form, the choices are only those contained in the group_to_add queryset
form = GruppiForm(prefix = 'gruppo')
I have models.py
class employees(models.Model):
emp_id=models.PositiveIntegerField()
emp_name = models.CharField(max_length = 100)
emp_lname = models.CharField(max_length = 100)
emp_loc=models.CharField(max_length=5,choices=LOCATION)
manager_id=models.ForeignKey('self',null=True,blank=True)
class leave(models.Model):
employee = models.ForeignKey(employees, on_delete=models.CASCADE, default='1')
start_date = models.DateField()
end_date = models.DateField()
status=models.CharField(max_length=1,choices=LEAVE_STATUS,default='P')
ltype=models.CharField(max_length=2,choices=LEAVE_TYPE)
message=models.CharField(max_length=500,blank=True)
class notify(models.Model):
sender_id=models.ForeignKey(leave, related_name='%(class)s_sendername')
receiver_id=models.ForeignKey(leave,related_name='%(class)s_receivername')
date_time=models.DateTimeField()
I have views.py
def accept(request):
approved_emp_id=leave.objects.filter(id=accept_id);
approving_emp_id=leave.objects.filter(employee__emp_id=request.user.username);
accept_notify=notify(sender_id=approving_emp_id, receiver_id=approved_emp_id,date_time=datetime.datetime.now(),viewed='N');
accept_notify.save()
When I want to save values to database I am getting error as ValueError: Cannot assign "<QuerySet [<leave: 121-geeta-2017-10-04-2017-10-06-C-V-2017-09-27 07:48:36.288873+00:00>]>": "notify.sender_id" must be a "leave" instance.
Where am I going wrong approving_emp_id and approved_emp_id are both leave instance only.
You are passing a QuerySet when the arguments should be an instance. A QuerySet is a list of instances. Pass only one instance. Use leave.objects.get() instead of leave.objects.filter().
objects.get() returns a single instance where objects.filter() returns a QuerySet.
def accept(request):
approved_emp_id = leave.objects.get(id = accept_id)
approving_emp_id = leave.objects.get(employee__emp_id = request.user.username)
accept_notify = notify(sender_id = approving_emp_id, receiver_id = approved_emp_id, date_time = datetime.datetime.now(), viewed = 'N')
accept_notify.save()
Another way is slicing the QuerySet.
def accept(request):
approved_emp_id = leave.objects.filter(id = accept_id)[0]
approving_emp_id = leave.objects.filter(employee__emp_id = request.user.username)[0]
accept_notify = notify(sender_id = approving_emp_id, receiver_id = approved_emp_id, date_time = datetime.datetime.now(), viewed = 'N')
accept_notify.save()
i have this model
class Post(models.Model):
auth = models.ForeignKey(settings.AUTH_USER_MODEL,default=1)
title = models.CharField(max_length=120)
DESCSPECSOFT = (
(u'Null','Null'),
(u'Phone',u'Phone'),
(u'Car',u'Car'),
(u'Laptop',u'Laptop'),
(u'jops',u'Jops'),
(u'Electronic',u'Electronic'),
(u'Clothes',u'Clothes'),
(u'Makeup',u'Makeup'),
(u'Furnishings',u'Furnishings'),
(u'books',u'books'),
(u'sports',u'sports'),
(u'Property',u'Property'),
(u'Other',u'Other'),
)
City = (
(u'Null','Null'),
(u'Kosti',u'Kosti'),
(u'Khartoum',u'Khartoum'),
(u'Rabbik',u'Rabbik'),
(u'Duwaim',u'Duwaim'),
(u'Sinnar',u'Sinnar'),
(u'Bahri',u'Bahri'),
(u'Omdurman',u'Omdurman'),
(u'Sawakin',u'Sawakin'),
(u'Port Sudan',u'Port Sudan'),
(u'Kasala',u'Kasala'),
(u'Madani',u'Madani'),
(u'Alabid',u'Alabid'),
)
Case = (
(u'Null','Null'),
(u'New',u'New'),
(u'Old',u'Old'),
(u'Second Hand',u'Second Hand'),
(u'Other',u'Other'),
)
Type = models.CharField(choices=DESCSPECSOFT, default='Null',blank = False,null = False,max_length=120)
company = models.CharField(max_length=120)
dis = models.TextField(default="in here you w,ll write all the discribtion about your product")
image = models.ImageField(null=True,blank=True,width_field="width_field", height_field="height_field")
width_field = models.IntegerField(default=0)
height_field = models.IntegerField(default=0)
case = models.CharField(choices=Case, default=99,blank = False,null = False,max_length=120)
price = models.BigIntegerField(default=0)
city = models.CharField(choices=City, default='Null',blank = False,null = False,max_length=120)
address = models.CharField(max_length=120)
draft = models.BooleanField(default=False)
#pup = models.DateField(auto_now=False,auto_now_add=False ,null=False)
date = models.DateTimeField(auto_now=True ,auto_now_add=False)
puplis = models.DateTimeField(auto_now=False ,auto_now_add=True)
objects = PostManager()
def __str__(self):
return self.title
def __unicode__(self):
return self.title
any user can add a post but i want the user name show in the data base means the user how add the post because every post show the admin name not the user how add the post can someone show me haw can i fix this ???
sorry my en is bad ...
I am getting this at every attempt.
Cannot assign "u''": "Company.parent" must be a "Company" instance.
I do not know what else to do.
The view code is still half baked, sorry for that.
Am I passing wrong parameters to the form?
I have the following model:
models.py
class Company(AL_Node):
parent = models.ForeignKey('self',
related_name='children_set',
null=True,
db_index=True)
node_order_by = ['id', 'company_name']
id = models.AutoField(primary_key=True)
company_name = models.CharField(max_length=100L, db_column='company_name') # Field name made lowercase.
next_billing_date = models.DateTimeField()
last_billing_date = models.DateTimeField(null=True)
weekly = 'we'
twice_a_month = '2m'
every_two_weeks = '2w'
monthly = 'mo'
billing_period_choices = (
(weekly, 'Weekly'),
(every_two_weeks, 'Every two weeks'),
(twice_a_month, 'Every two weeks'),
(monthly, 'Monthly'),
)
billing_period = models.CharField(max_length=2,
choices=billing_period_choices,
default=weekly)
objects = CompanyManager()
The following forms.py:
class newCompany(ModelForm):
company_name = forms.CharField(label='Company Name',
widget=forms.TextInput(attrs={'class': 'oversize expand input-text'}))
billing_period = forms.ModelChoiceField
next_billing_date = forms.CharField(widget=forms.TextInput(attrs={'class': 'input-text small', 'id': 'datepicker'}))
parent = forms.CharField(widget=forms.HiddenInput(), required=False)
class Meta:
model = Company
fields = ["company_name", "parent", "billing_period", "next_billing_date"]
The following view:
def create_company(request):
userid = User.objects.get(username=request.user).id
my_company_id = CompanyUsers.objects.get(user_id=userid).company_id
my_company_name = Company.objects.get(id=my_company_id).company_name
machines = Title.objects.raw(
'select machines.id, title.name, machines.moneyin, machines.moneyout, moneyin - moneyout as profit, machines.lastmoneyinoutupdate, (select auth_user.username from auth_user where machines.operator = auth_user.id) as operator, (select auth_user.username from auth_user where machines.readers = auth_user.id) as readers from machines, title where machines.title = title.id and machines.company_id =%s',
[my_company_id])
if request.method == 'POST':
form_company = newCompany(request.POST)
if form_company.is_valid():
new_company = form_company.save(commit=False)
new_company.parent = my_company_id
if request.POST.get('select_machine'):
selected_machine = request.POST.getlist('select_machine')
percentage = request.POST.get('percentage')
if not Beneficiary.objects.check_assign_machine(my_company_id, selected_machine, percentage):
target_company_name = new_company.company_name
target_company_id = Company.objects.get(company_name=target_company_name).id
new_company.save()
Machines.objects.assign_machine(target_company_id, selected_machine)
Beneficiary.objects.create_beneficiary(percentage, target_company_name, my_company_id, selected_machine)
else:
invalid_machines = Beneficiary.objects.check_assign_machine(my_company_id, selected_machine, percentage)
return render(request, 'lhmes/createcompany.html',
{'form_company': form_company, 'machines': machines, 'my_company_name': my_company_name, 'invalid_machines' : invalid_machines})
else:
new_company.save()
else:
form_company = newCompany()
return render(request, 'lhmes/createcompany.html',
{'form_company': form_company, 'machines': machines, 'my_company_name': my_company_name})
The error message says you are trying to set a relationship with a string but Django expects the value to be an instance of the Company model. You should assign the foreign key fields with a real model instance instead of only the primary key.
I've spotted a few places in the code where you are assigning a PK:
new_company.parent = my_company_id
Where the model expects it to be an instance:
new_company.parent = Company.objects.get(id=my_company_id)
I really don't remember if this works, but you can try:
new_company.parent_id = int(my_company_id)
This would spare a trip to the database.