Develop Reference

Django write a get_form() function

I have an app that creates modelForms dynamically based on models. These forms must be dynamically loaded on the template.
I need to write a function in my view that gets all the forms from forms.py or gets a specific form by it's name. Something similar to get_models(appName) and get_model(AppName, modelName) but for forms instead of models.
How can I write it and where should I write it?
in Registery or in forms or somewhere else?
Here is my code:
Models.py
class PrimaryInfo(models.Model):
Name = models.CharField(max_length=200, blank=False, null=True) #required. Must be filled by user
Surname = models.CharField(max_length=200, blank=False, null=True)
DateOfBirth = models.DateField('date of birth', blank=False, null=True)
<Some Other fields>
...
def calculateAge(self):
if not self.DateOfBirth is None:
thisYear = timezone.now().date().year
return thisYear - self.DateOfBirth.year
pass
<some other functions>
...
#Here come all the related tables
class Jobs(models.Model):
Rel = models.ForeignKey(PrimaryInfo, on_delete=models.CASCADE)
Job = models.CharField(max_length=200)
Age = models.IntegerField(default=0)
Country = models.CharField(max_length=200)
def __str__(self):
return self.Job
<some other related models>
....
My View:
def detail(request, personId):
appName = urls.app_name
tablesPrefix = appName + '_'
person = PrimaryInfo.objects.get(pk = personId)
peopledbModels = apps.get_models(appName)
fieldsList = []
relatedModels = []
relationshipsDic = {}
formsFileName = "write.py"
parentModelForms = []
# identify which models are parent and which ones are relationships. makes a dictionary (Of string, list) for the results.
for m in peopledbModels:
if m._meta.db_table.startswith(appName):
fields = m._meta.get_fields()
for fld in fields:
if fld.is_relation:
if fld.many_to_one or fld.many_to_many or fld.one_to_one:
pass
else:
relatedModels.append(fld.name)
relationshipsDic["{}".format(m._meta.label).replace("{}.".format(appName),"")] = relatedModels
#Write the modelForm from parent model into forms.py
for pmdl in relationshipsDic.keys():
parentModelName = pmdl
modelFormExist = False
with open("{}{}/{}".format(djangoSettings.MEDIA_ROOT, appName, formsFileName)) as file:
if "class {}Form(forms.ModelForm):".format(parentModelName) in file.read():
file.close()
modelFormExist = True
if modelFormExist == False:
with open("{}{}/{}".format(djangoSettings.MEDIA_ROOT, appName, formsFileName), "a+") as file:
file.write("\n\nclass {0}Form(forms.ModelForm):\n\tclass Meta:\n\t\tmodel = {0}\n\t\tfields = '__all__'".format(parentModelName))
file.close()
parentModel = apps.get_model(appName, pmdl)
instance = get_object_or_404(parentModel, pk=personId)
parentModelForm = "{}Form".format(pmdl) #this is where I need to get the form object with a variable name from forms.py
parentModelForm = parentModelForm(instance = instance) #this is not working (string object is not callable)
parentModelForms.append(parentModelForm)
<then pass this list of models to the template>
...
My forms (automatically populated from my view):
class PrimaryInfoForm(forms.ModelForm):
class Meta:
model = PrimaryInfo
fields = '__all__'
class JobsForm(forms.ModelForm):
class Meta:
model = Jobs
fields = '__all__'

UpdateView does not show existing data when using filter

I am quite new with Django and I need help.
My problem is quite similar what Mike had in his case:
UpdateView not populating form with existing data, but I have not found solution yet.
My goal is to view owner dropdown selection list only those users who are members of the organization.
models.py
# organizations.models.py
...
from accounts.models import User
from core.models import TimeStampModel
...
class Organization(TimeStampModel, models.Model):
id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
name = models.CharField(
verbose_name=_('Name'),
max_length=255,
unique=True
)
code = models.CharField(
verbose_name=_('Code'),
max_length=255,
null=True,
blank=True
)
owner = models.ForeignKey(
User,
on_delete=models.PROTECT,
verbose_name=_('Owner'),
related_name='owner',
help_text=_('Organization Owner and Contact Person'),
)
slug = models.SlugField(verbose_name=_('Organization key'), unique=True)
...
class Meta:
verbose_name = _('Organization')
verbose_name_plural = _('Organization')
ordering = ['name', 'code']
def __str__(self):
return f'{self.name}, {self.code}'
# Create automatically slug value from organization name field.
# In case similar is exist then add extra count digit end of slug.
def _get_unique_slug(self):
slug = slugify(self.name)
unique_slug = slug
num = 1
while Organization.objects.filter(slug=unique_slug).exists():
unique_slug = '{}-{}'.format(slug, num)
num += 1
return unique_slug
def save(self, *args, **kwargs):
if not self.slug:
self.slug = self._get_unique_slug()
self.next_update = timezone.now() + relativedelta(
months=self.update_interval)
super(Organization, self).save(*args, **kwargs)
def get_absolute_url(self):
kwargs = {
'slug': self.slug
}
return reverse('organization_main_page', kwargs=kwargs)
class OrganizationMembers(models.Model):
id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
organization = models.ForeignKey(
Organization,
on_delete=models.CASCADE,
verbose_name=_('Organization')
)
member = models.ForeignKey(
User,
on_delete=models.CASCADE,
verbose_name=_('Member'),
null=True,
blank=True
)
organization_admin = models.BooleanField(
verbose_name=_('Organization admin'),
default=False
)
class Meta:
verbose_name = _('Organization: Member')
verbose_name_plural = _('Organization: Members')
ordering = ['organization', 'member']
unique_together = ('organization', 'member')
def __str__(self):
return f'{self.member}'
def get_absolute_url(self):
kwargs = {
'slug': self.slug
}
return reverse('organization_detail', kwargs=kwargs)
forms.py
# organizations.forms.py
....
from accounts.models import User
from .models import Organization, OrganizationMembers
...
class OrganizationUpdateForm(forms.ModelForm):
class Meta:
model = Organization
fields = '__all__'
exclude = ('date_created', 'created_by', 'created_by_id',
'last_updated', 'last_updated_by', 'last_updated_by_id',
'next_update', 'slug')
# Restrict user selection lists to view only members of the organization
def __init__(self, *args, **kwargs):
inst = kwargs.get('instance', None)
super(OrganizationUpdateForm, self).__init__(*args, **kwargs)
self.fields['owner'].queryset = OrganizationMembers.objects.\ # <--- !!!
filter(organization_id=inst.id)
In the forms.py, if I comment out self.field['owner]... line, then owner field will show saved value from database, but then I can see all users in the dropdown list. When queryset is enabled then selection list show correct users, but saved value is not visible.
views.py
# organizations.views.py
from .forms import OrganizationUpdateForm
from accounts.models import User
from .models import Organization, OrganizationMembers
class OrganizationUpdateView(LoginRequiredMixin, UpdateView):
model = Organization
form_class = OrganizationUpdateForm
template_name = 'organizations/organization_update.html'
success_url = reverse_lazy('organizations')
# Save data and set current user to last updated by fields
def form_valid(self, form):
object = form.save(commit=False)
object.last_updated_by = self.request.user.get_full_name()
object.last_updated_by_id = self.request.user
return super(OrganizationUpdateView, self).form_valid(form)
def get_queryset(self):
criteria1 = Q(owner=self.request.user)
criteria2 = Q(organizationmembers__member=self.request.user)
criteria3 = Q(organizationmembers__organization_admin=1)
org_list = Organization.objects.\
filter(criteria1 | (criteria2 & criteria3)).distinct()
if org_list.count() != 0:
return org_list
else:
raise Http404('You don\'t have permissions!')
In Mikes case Chiheb has commented that "With UpdateView it's a little bit tricky. So, in order to initialize your form's data, you need to do it in the view itself not in the form."
What is the reason that cannot add filter to UpdateView?
Please can someone help me to solve my problem. Thanks.
UPDATE
Not filtered. Value from database is visible
Not filtered. Dropdown list show all users in the system
Filter enabled. Value is not visible
Filter enabled. Dropdown list show correct valeus

The problem is that owner in your models is a FK to User model, but you are filtering queryset in form by OrganizationMembers. Make it the same and the problem should be gone.

Setting value of Django M2M through relationship via ModelForm

I am working on a set of product / category relationships in a Django application.
A product can belong to any category and needs to be ordered within that category, I am trying to do this using a Many to Many relationship with a "through=" option.
When a POST request is made via Ajax it takes the form of b'ordered_products=4&ordered_products=5', I received an error straight after the forms __init__ call that "5 is not one of the available choices" where 5 is the valid id of anOrderedCategoryManagedProduct object.
models.py
class Category(models.Model):
name = models.CharField(max_length=128)
slug = models.SlugField(max_length=128, unique=True)
class Product(models.Model):
name = models.CharField(max_length=128)
category_management = models.ManyToManyField(
Category,
related_name="category_managed_products",
through="OrderedCategoryManagedProduct",
blank=True,
verbose_name="Category Management",
)
class OrderedCategoryManagedProduct(SortableModel):
category = models.ForeignKey(
Category, on_delete=models.CASCADE, related_name="cm_products"
)
product = models.ForeignKey(
Product, on_delete=models.CASCADE, related_name="cm_categories"
)
class Meta:
ordering = ["sort_order"]
def get_ordering_queryset(self):
return self.product.category_management()
class SortableModel(models.Model):
sort_order = models.IntegerField(db_index=True, null=True)
class Meta:
abstract = True
views.py
# POST = <QueryDict: {'ordered_products': [5, 4]}>
#staff_member_required
#permission_required("menu.manage_menus")
def ajax_reorder_menu_items(request, category_pk):
category = get_object_or_404(Category, pk=category_pk)
form = ReorderCategoryProductsForm(request.POST, instance=category)
status = 200
ctx = {}
if form.is_valid():
form.save()
elif form.errors:
status = 400
ctx = {"error": form.errors}
return JsonResponse(ctx, status=status)
forms.py
class ReorderCategoryProductsForm(forms.ModelForm):
ordered_products = OrderedModelMultipleChoiceField(
queryset=OrderedCategoryManagedProduct.objects.none()
)
class Meta:
model = Category
fields = ["id"]
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
if self.instance:
self.fields["ordered_products"].queryset = self.instance.cm_products.all()
pass
def save(self):
for sort_order, category in enumerate(self.cleaned_data["ordered_products"]):
category.cm_products.sort_order = sort_order
category.save()
return self.instance
class OrderedModelMultipleChoiceField(forms.ModelMultipleChoiceField):
def clean(self, value):
qs = super().clean(value)
keys = list(map(int, value))
return sorted(qs, key=lambda v: keys.index(v.pk))

Big thanks to the #django IRC channel for the help on this, if anyone suffers the same problem the correct code was as follows:
class ReorderCategoryProductsForm(forms.ModelForm):
ordered_products = OrderedModelMultipleChoiceField(
queryset=OrderedCategoryManagedProduct.objects.all()
)
class Meta:
model = Category
fields = ["id"]
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
if self.instance:
self.fields["ordered_products"].queryset = self.instance.cm_products.all()
pass
def save(self):
for sort_order, ocmp in enumerate(self.cleaned_data["ordered_products"]):
ocmp.sort_order = sort_order
ocmp.save()
return self.instance

get() returned more than one Children -- it returned 2! in django

I have a linked model:
class Children(models.Model):
person = models.ForeignKey(Person, on_delete=models.CASCADE)
child_name = models.CharField(max_length=150, null=True, blank=True)
slug = AutoSlugField(populate_from='child_name')
blood_group = models.CharField(max_length=5, blank=True)
class Meta:
unique_together = ('slug', 'person')
def get_absolute_url(self):
return self.person.get_absolute_url()
def get_delete_url(self):
return reverse(
'member:children-delete',
kwargs={
'person_slug': self.person.slug,
'children_slug': self.slug})
def get_update_url(self):
return reverse(
'member:children-update',
kwargs={
'person_slug': self.person.slug,
'children_slug': self.slug})
my forms.py:
class ChildrenForm( SlugCleanMixin, forms.ModelForm):
class Meta:
model = Children
exclude = ('person',)
def clean(self):
cleaned_data = super().clean()
slug = cleaned_data.get('slug')
person_obj = self.data.get('person')
exists = (
Children.objects.filter(
slug__iexact=slug,
person=person_obj,
).exists())
if exists:
raise ValidationError(
"Children with this Slug "
"and Person already exists.")
else:
return cleaned_data
def save(self, **kwargs):
instance = super().save(commit=False)
instance.person = (
self.data.get('person'))
instance.save()
self.save_m2m()
return instance
views.py:
class ChildrenCreate( ChildrenFormMixin, ChildrenGetObjectMixin,
PersonContextMixin,CreateView):
template_name = 'member/children_form.html'
model = Children
form_class = ChildrenForm
class ChildrenUpdate(ChildrenFormMixin, ChildrenGetObjectMixin,
PersonContextMixin,UpdateView):
template_name = 'member/children_form.html'
model = Children
form_class = ChildrenForm
slug_url_kwarg = 'children_slug'
class ChildrenDelete(ChildrenFormMixin,ChildrenGetObjectMixin,
PersonContextMixin,DeleteView):
model = Children
slug_url_kwarg = 'children_slug'
def get_success_url(self):
return (self.object.person
.get_absolute_url())
my utils.py:
class ChildrenFormMixin():
def get_form_kwargs(self):
kwargs = super().get_form_kwargs()
if self.request.method in ('POST', 'PUT'):
self.person = get_object_or_404(
Person,
slug__iexact=self.kwargs.get(
self.person_slug_url_kwarg))
data = kwargs['data'].copy()
data.update({'person': self.person})
kwargs['data'] = data
return kwargs
class ChildrenGetObjectMixin():
def get_object(self, queryset=None):
person_slug = self.kwargs.get(
self.person_slug_url_kwarg)
children_slug = self.kwargs.get(
self.slug_url_kwarg)
return get_object_or_404(
Children,
slug__iexact=children_slug,
person__slug__iexact=person_slug)
class PersonContextMixin():
person_slug_url_kwarg = 'person_slug'
person_context_object_name = 'person'
def get_context_data(self, **kwargs):
person_slug = self.kwargs.get(
self.person_slug_url_kwarg)
person = get_object_or_404(
Person, slug__iexact=person_slug)
context = {
self.person_context_object_name:
person,
}
context.update(kwargs)
return super().get_context_data(**context)
The children created more than one for same name of same parents. When I tried to edit children it gives "get() returned more than one Children -- it returned 2!" error. In traceback, it said, 'person__slug__iexact=person_slug' is the direct causes of this traceback.
In the form, I added clean method to catch the error and maintain uniqueness of children name of same parents but it not worked. Could I get suggestions where I do wrong?
Edit:
my Person model:
class Person(models.Model):
name = models.CharField(max_length=250)
slug = AutoSlugField(populate_from='name')
birth_date = models.DateField(null=True, blank=True)
blood_group = models.CharField(max_length=5)
present_address = models.CharField(max_length=250, blank=True)
permanent_address = models.CharField(max_length=250, blank=True)
user = models.OneToOneField(
settings.AUTH_USER_MODEL,
related_name='member_persons')
class Meta:
ordering = ['name']
unique_together = ['name', 'birth_date']

I believe you are using AutoSlugField from django-autoslug, and you trying to get by non-unique field. AutoSlugField won't make your field unique by default, from docs:
AutoSlugField can also perform the following tasks on save:
populate itself from another field (using populate_from),
use custom slugify function (using slugify or Settings), and
preserve uniqueness of the value (using unique or unique_with).
None of the tasks is mandatory, i.e. you can have auto-populated non-unique fields, manually entered unique ones (absolutely unique or within a given date) or both.
So quick fix would be slug = AutoSlugField(populate_from='child_name', unique=True)
UPDATE(Since you posted your Person model)
The problem is the same and solution is the same.
Explanation:
For example you have two Person objects:
id name slug birth_date
1 alex alex 10.10.2016
2 alex alex 10.10.2015
This won't violate unique_together = ['name', 'birth_date']
And you got two Children objects:
id name slug person_id
1 john john 1
2 john john 2
And that won't violate unique_together = ('slug', 'person') neither
Then you are making query
get_object_or_404(
Children,
slug__iexact='john',
person__slug__iexact='alex')
Which would match two objects. So you got problem. Quick fix would be to make slug unique=True.

Django: Slugify Post Data

I'm trying to save some form data inputted by the user. I would like to slugify the "name" which was entered by the user, but dont want the slug field to show on the template that the user sees. I tried to do it manually with the sell function that you see below, but cant quite get it to work. I want to eventually save the slugified name into the Item model I have listed below. I'm sure there's a much smarter/simpler way than the sell function I'm currently using :P. Thanks in advance!
class Item(models.Model):
user = models.ForeignKey(User)
name = models.CharField(max_length=75)
slug = models.SlugField(max_length=50, unique=True)
is_active = models.BooleanField(default=True)
image = models.CharField(max_length=50)
price = models.DecimalField(max_digits=9, decimal_places=2)
quantity = models.IntegerField(default=1)
description = models.TextField()
created = models.DateTimeField(auto_now_add=True)
shipping_price = models.DecimalField(decimal_places=2, max_digits=6)
categories = models.ManyToManyField(Category)
class AddItem(forms.ModelForm):
class Meta:
model = Item
exclude = ('user','slug','is_active',)
def sell(request):
if request.method == "POST":
form = AddItem(request.POST)
item = form.save(commit=False)
item.user = request.user
item.is_active = True
item.slug = slugify(form.name) **#not sure what this line should be?**
item.save()
if form.is_valid():
form.save()
return HttpResponseRedirect('thanks.html')
else:
url = urlresolvers.reverse('register')
return HttpResponseRedirect(url)

You can exclude slug from user form.
And slugify in pre_save signal.
from django.dispatch import receiver
from django.db.models.signals import pre_save
#receiver(pre_save, sender=Item)
def iter_pre_save_handler(sender, instance, **kwargs):
if not instance.pk:
instance.slug = slugify(instance.name)

According to the docs, you can exclude a field from being rendered in a model form like this:
class PartialAuthorForm(ModelForm):
class Meta:
model = Author
fields = ('name', 'title')
or
class PartialAuthorForm(ModelForm):
class Meta:
model = Author
exclude = ('birth_date',)
or by setting editable=False on the Field instance in your model.
Once you have done this, you can override the save method of the model, as the comments in the OP have suggested:
# shamelessly copied from http://stackoverflow.com/questions/837828/how-do-i-create-a-slug-in-django/837835#837835
from django.template.defaultfilters import slugify
class test(models.Model):
q = models.CharField(max_length=30)
s = models.SlugField()
def save(self, *args, **kwargs):
self.s = slugify(self.q)
super(test, self).save(*args, **kwargs)