Ok im new to django
So ive got a situation where i want a formset to have dynamic initial data
So basically here is what im looking for.
each form in the formset to have a different UserID
and a set of groups permission which they can choose from based from the initial data
here is my form
class assignGroupPermissionToUser(forms.ModelForm):
UserID = forms.ModelChoiceField(queryset=None)
Groups = forms.ModelMultipleCHoiceField(queryset=None, widget=FilteredSelectMultiple("Groups")
class Meta:
model=User
def __init__(self,*args,**kwargs):
super().__init__(*args,**kwargs)
Userid = kwargs.pop("UserID")
self.fields['UserID'].queryset =User.objects.get(UserID=Userid)
Permissions = kwargs.pop("Groups")
listofPermission = None
for each perm in permission:
listofPermission |= Permissions.objects.filter(GroupID=perm)
self.fields['Groups'].queryset = listofPermission
the data i wanna pass is built into a list like so
it is called
completeList
> completeList =[['13452',{'group1':'Admin','group2':'FrontDesk'}],['3532','group1':'Supervisors','group2':'ReadOnly;}]]
where the first value in each nested loop is the UserID, and the dictionary is the groups they can choose from.
override method in View.py
....
form = assignGroupPermissionToUser()
assignment = formset_factory(form,extra=0)
formset = [ assignment.__init__(completeList[x][0],completeList[x][1]) for x in range(len(completeList))]
then i get an error that str object has no 'is_bound' field line 58 of formset.py
im trytin to get this data to show up on each form and based on the user
it will be all different but everything i try to override it fails for initial form so here i am stuck
note that the Group attribute in the modelform has a widget which is used in the admin section to filter from multiple choices.
settings
Django= 1.8
python 3.5
i erased all this code and just did two loops like so
formset = assignments(initial=[{'UserID': listofUserID[x] } for x in range(len(completeList))])
#then
for form in formset:
form.fields['permissions'].queryset = querysetiwant
Related
I am developing an application using django where the UI needs to be updated when user interacts with it. For instance I have a Drop down field where the user selects a drink and submits it then based on that a dropdown with the places that drink is available, price and quantity at each place needs to be displayed. The user will then further submit the form for second process.
From my understanding the Forms in django are pre-defined and I am not able to think of a way using which I could achieve this.
What I could come up was defining a regular form class
class dform(forms.Form):
SOURCES_CHOICES = (
(A, 'A'),
(E, 'E'),
)
drink = forms.ChoiceField(choices = SOURCES_CHOICES)
location = forms.ChoiceField(choices = **GET THIS FROM DATABASE**)
quantity = forms.ChoiceField(choices = **GET THIS FROM DATABASE**)
.
.
.
My view is like,
def getdrink():
if request.method == 'POST':
#code for handling form
drink = dform.cleaned_data['drink']
#code to get values from database
I have no idea how to generate or populate or append the values i get from the database to the choicefield in my form. I did try looking up on SO but none of the solutions here explained properly how to do it. Also, due to certain requirements I am not using the models. So my database is not at all related to the models.
I am at a total loss Please help me out
class MyForm(forms.Form):
my_choice_field = forms.ChoiceField(choices=MY_CHOICES)
So if you want the values to be dynamic(or dependent of some logic) you can simply modify your code to something like this:
either
def get_my_choices():
# you place some logic here
return choices_list
class MyForm(forms.Form):
my_choice_field = forms.ChoiceField(choices=get_my_choices())
or
User_list = [ #place logic here]
class MyForm(forms.Form):
my_choice_field = forms.ChoiceField(choices=get_my_choices())
but once database value is updated, new data value will be popoulated only on restart of server.
So write a function like this in forms:
class MyForm(forms.Form):
def __init__(self, *args, **kwargs):
super(MyForm, self).__init__(*args, **kwargs)
self.fields['my_choice_field'] = forms.ChoiceField( choices=get_my_choices() )
or in place of the get_my_choices u can ad the USER_LIST too.
If you have models for location and quantity, a ModelChoiceField should work:
class dform(forms.Form):
location = forms.ModelChoiceField(queryset = Location.objects.all())
Otherwise, you'll need to query the database directly, for example:
class dform(forms.Form):
location = forms.ChoiceField(choices = get_location_choices())
# elsewhere
from django.db import connection
def get_location_choices():
cursor = connection.cursor()
cursor.execute("select location_id, name from location_table")
return cursor.fetchall()
The SQL query to use here depends on your database engine and table schema.
I think that, based on my understanding of your question, the best solution would be to include JSON objects with your form and load these using jQuery instead of submitting the form over and over. Included in your form, you should add something like:
class MyForm(forms.Form):
CHOICE_DICT = {
'choice_1': [
'option_1',
'option_2',
],
etc...
Then you should include form.CHOICE_DICT in your context, load that with jQuery, and render it depending on changes to other fields.
I'm trying to do something that should be very common: add/edit a bunch of related models in a single form. For example:
Visitor Details:
Select destinations and activities:
Miami [] - swimming [], clubbing [], sunbathing[]
Cancun [] - swimming [], clubbing [], sunbathing[]
My models are Visitor, Destination and Activity, with Visitor having a ManyToMany field into Destination through an intermediary model, VisitorDestination, which has the details of the activities to be done on the destination (in itself a ManyToMany field into Activity).
Visitor ---->(M2M though VisitorDestination) -------------> Destination
|
activities ---->(M2M)---> Activity
Note that I don't want to enter new destination / activity values, just choose from those available in the db (but that's a perfectly legit use of M2M fields right?)
To me this looks like an extremely common situation (a many to many relation with additional details which are a FK or M2M field into some other model), and this looks like the most sensible modelling, but please correct me if I'm wrong.
I've spent a few days searching Django docs / SO / googling but haven't been able to work out how to deal with this. I tried several approaches:
Custom Model form for Visitor, where I add multiple choice fields for Destination and Activity. That works ok if Destination and Activity could be selected independently, but here they are correlated, ie I want to choose one or several activities for each destination
Using inlineformset_factory to generate the set of destination / activities forms, with inlineformset_factory(Destination, Visitor). This breaks, because Visitor has a M2M relation to Destination, rather than a FK.
Customizing a plain formset, using formset_factory, eg DestinationActivityFormSet = formset_factory(DestinationActivityForm, extra=2). But how to design DestinationActivityForm? I haven't explored this enough, but it doesn't look very promising: I don't want to type in the destination and a list of activities, I want a list of checkboxes with the labels set to the destination / activities I want to select, but the formset_factory would return a list of forms with identical labels.
I'm a complete newbie with django so maybe the solution is obvious, but I find that the documentation in this area is very weak - if anyone has some pointers to examples of use for forms / formsets that would be also helpful
thanks!
In the end I opted for processing multiple forms within the same view, a Visitor model form for the visitor details, then a list of custom forms for each of the destinations.
Processing multiple forms in the same view turned out to be simple enough (at least in this case, where there were no cross-field validation issues).
I'm still surprised there is no built-in support for many to many relationships with an intermediary model, and looking around in the web I found no direct reference to it. I'll post the code in case it helps anyone.
First the custom forms:
class VisitorForm(ModelForm):
class Meta:
model = Visitor
exclude = ['destinations']
class VisitorDestinationForm(Form):
visited = forms.BooleanField(required=False)
activities = forms.MultipleChoiceField(choices = [(obj.pk, obj.name) for obj in Activity.objects.all()], required=False,
widget = CheckboxSelectMultipleInline(attrs={'style' : 'display:inline'}))
def __init__(self, visitor, destination, visited, *args, **kwargs):
super(VisitorDestinationForm, self).__init__(*args, **kwargs)
self.destination = destination
self.fields['visited'].initial = visited
self.fields['visited'].label= destination.destination
# load initial choices for activities
activities_initial = []
try:
visitorDestination_entry = VisitorDestination.objects.get(visitor=visitor, destination=destination)
activities = visitorDestination_entry.activities.all()
for activity in Activity.objects.all():
if activity in activities:
activities_initial.append(activity.pk)
except VisitorDestination.DoesNotExist:
pass
self.fields['activities'].initial = activities_initial
I customize each form by passing a Visitor and Destination objects (and a 'visited' flag which is calculated outside for convenience)
I use a boolean field to allow the user to select each destination. The field is called 'visited', however I set the label to the destination so it gets nicely displayed.
The activities get handled by the usual MultipleChoiceField (I used I customized widget to get the checkboxes to display on a table, pretty simple but can post it if somebody needs that)
Then the view code:
def edit_visitor(request, pk):
visitor_obj = Visitor.objects.get(pk=pk)
visitorDestinations = visitor_obj.destinations.all()
if request.method == 'POST':
visitorForm = VisitorForm(request.POST, instance=visitor_obj)
# set up the visitor destination forms
destinationForms = []
for destination in Destination.objects.all():
visited = destination in visitorDestinations
destinationForms.append(VisitorDestinationForm(visitor_obj, destination, visited, request.POST, prefix=destination.destination))
if visitorForm.is_valid() and all([form.is_valid() for form in destinationForms]):
visitor_obj = visitorForm.save()
# clear any existing entries,
visitor_obj.destinations.clear()
for form in destinationForms:
if form.cleaned_data['visited']:
visitorDestination_entry = VisitorDestination(visitor = visitor_obj, destination=form.destination)
visitorDestination_entry.save()
for activity_pk in form.cleaned_data['activities']:
activity = Activity.objects.get(pk=activity_pk)
visitorDestination_entry.activities.add(activity)
print 'activities: %s' % visitorDestination_entry.activities.all()
visitorDestination_entry.save()
success_url = reverse('visitor_detail', kwargs={'pk' : visitor_obj.pk})
return HttpResponseRedirect(success_url)
else:
visitorForm = VisitorForm(instance=visitor_obj)
# set up the visitor destination forms
destinationForms = []
for destination in Destination.objects.all():
visited = destination in visitorDestinations
destinationForms.append(VisitorDestinationForm(visitor_obj, destination, visited, prefix=destination.destination))
return render_to_response('testapp/edit_visitor.html', {'form': visitorForm, 'destinationForms' : destinationForms, 'visitor' : visitor_obj}, context_instance= RequestContext(request))
I simply collect my destination forms in a list and pass this list to my template, so that it can iterate over them and display them. It works well as long as you don't forget to pass a different prefix for each one in the constructor
I'll leave the question open for a few days in case some one has a cleaner method.
Thanks!
So, as you've seen, one of the things about inlineformset_factory is that it expects two models - a parent, and child, which has a foreign key relationship to the parent. How do you pass extra data on the fly to the form, for extra data in the intermediary model?
How I do this is by using curry:
from django.utils.functional import curry
from my_app.models import ParentModel, ChildModel, SomeOtherModel
def some_view(request, child_id, extra_object_id):
instance = ChildModel.objects.get(pk=child_id)
some_extra_model = SomeOtherModel.objects.get(pk=extra_object_id)
MyFormset = inlineformset_factory(ParentModel, ChildModel, form=ChildModelForm)
#This is where the object "some_extra_model" gets passed to each form via the
#static method
MyFormset.form = staticmethod(curry(ChildModelForm,
some_extra_model=some_extra_model))
formset = MyFormset(request.POST or None, request.FILES or None,
queryset=SomeObject.objects.filter(something=something), instance=instance)
The form class "ChildModelForm" would need to have an init override that adds the "some_extra_model" object from the arguments:
def ChildModelForm(forms.ModelForm):
class Meta:
model = ChildModel
def __init__(self, some_extra_model, *args, **kwargs):
super(ChildModelForm, self).__init__(*args, **kwargs)
#do something with "some_extra_model" here
Hope that helps get you on the right track.
From django 1.9, there is a support for passing custom parameters to formset forms :
https://docs.djangoproject.com/en/1.9/topics/forms/formsets/#passing-custom-parameters-to-formset-forms
Just add form_kwargs to your FormSet init like this :
from my_app.models import ParentModel, ChildModel, SomeOtherModel
def some_view(request, child_id, extra_object_id):
instance = ChildModel.objects.get(pk=child_id)
some_extra_model = SomeOtherModel.objects.get(pk=extra_object_id)
MyFormset = inlineformset_factory(ParentModel, ChildModel, form=ChildModelForm)
formset = MyFormset(request.POST or None, request.FILES or None,
queryset=SomeObject.objects.filter(something=something), instance=instance,
form_kwargs={"some_extra_model": some_extra_model})
I'm trying to do something that should be very common: add/edit a bunch of related models in a single form. For example:
Visitor Details:
Select destinations and activities:
Miami [] - swimming [], clubbing [], sunbathing[]
Cancun [] - swimming [], clubbing [], sunbathing[]
My models are Visitor, Destination and Activity, with Visitor having a ManyToMany field into Destination through an intermediary model, VisitorDestination, which has the details of the activities to be done on the destination (in itself a ManyToMany field into Activity).
Visitor ---->(M2M though VisitorDestination) -------------> Destination
|
activities ---->(M2M)---> Activity
Note that I don't want to enter new destination / activity values, just choose from those available in the db (but that's a perfectly legit use of M2M fields right?)
To me this looks like an extremely common situation (a many to many relation with additional details which are a FK or M2M field into some other model), and this looks like the most sensible modelling, but please correct me if I'm wrong.
I've spent a few days searching Django docs / SO / googling but haven't been able to work out how to deal with this. I tried several approaches:
Custom Model form for Visitor, where I add multiple choice fields for Destination and Activity. That works ok if Destination and Activity could be selected independently, but here they are correlated, ie I want to choose one or several activities for each destination
Using inlineformset_factory to generate the set of destination / activities forms, with inlineformset_factory(Destination, Visitor). This breaks, because Visitor has a M2M relation to Destination, rather than a FK.
Customizing a plain formset, using formset_factory, eg DestinationActivityFormSet = formset_factory(DestinationActivityForm, extra=2). But how to design DestinationActivityForm? I haven't explored this enough, but it doesn't look very promising: I don't want to type in the destination and a list of activities, I want a list of checkboxes with the labels set to the destination / activities I want to select, but the formset_factory would return a list of forms with identical labels.
I'm a complete newbie with django so maybe the solution is obvious, but I find that the documentation in this area is very weak - if anyone has some pointers to examples of use for forms / formsets that would be also helpful
thanks!
In the end I opted for processing multiple forms within the same view, a Visitor model form for the visitor details, then a list of custom forms for each of the destinations.
Processing multiple forms in the same view turned out to be simple enough (at least in this case, where there were no cross-field validation issues).
I'm still surprised there is no built-in support for many to many relationships with an intermediary model, and looking around in the web I found no direct reference to it. I'll post the code in case it helps anyone.
First the custom forms:
class VisitorForm(ModelForm):
class Meta:
model = Visitor
exclude = ['destinations']
class VisitorDestinationForm(Form):
visited = forms.BooleanField(required=False)
activities = forms.MultipleChoiceField(choices = [(obj.pk, obj.name) for obj in Activity.objects.all()], required=False,
widget = CheckboxSelectMultipleInline(attrs={'style' : 'display:inline'}))
def __init__(self, visitor, destination, visited, *args, **kwargs):
super(VisitorDestinationForm, self).__init__(*args, **kwargs)
self.destination = destination
self.fields['visited'].initial = visited
self.fields['visited'].label= destination.destination
# load initial choices for activities
activities_initial = []
try:
visitorDestination_entry = VisitorDestination.objects.get(visitor=visitor, destination=destination)
activities = visitorDestination_entry.activities.all()
for activity in Activity.objects.all():
if activity in activities:
activities_initial.append(activity.pk)
except VisitorDestination.DoesNotExist:
pass
self.fields['activities'].initial = activities_initial
I customize each form by passing a Visitor and Destination objects (and a 'visited' flag which is calculated outside for convenience)
I use a boolean field to allow the user to select each destination. The field is called 'visited', however I set the label to the destination so it gets nicely displayed.
The activities get handled by the usual MultipleChoiceField (I used I customized widget to get the checkboxes to display on a table, pretty simple but can post it if somebody needs that)
Then the view code:
def edit_visitor(request, pk):
visitor_obj = Visitor.objects.get(pk=pk)
visitorDestinations = visitor_obj.destinations.all()
if request.method == 'POST':
visitorForm = VisitorForm(request.POST, instance=visitor_obj)
# set up the visitor destination forms
destinationForms = []
for destination in Destination.objects.all():
visited = destination in visitorDestinations
destinationForms.append(VisitorDestinationForm(visitor_obj, destination, visited, request.POST, prefix=destination.destination))
if visitorForm.is_valid() and all([form.is_valid() for form in destinationForms]):
visitor_obj = visitorForm.save()
# clear any existing entries,
visitor_obj.destinations.clear()
for form in destinationForms:
if form.cleaned_data['visited']:
visitorDestination_entry = VisitorDestination(visitor = visitor_obj, destination=form.destination)
visitorDestination_entry.save()
for activity_pk in form.cleaned_data['activities']:
activity = Activity.objects.get(pk=activity_pk)
visitorDestination_entry.activities.add(activity)
print 'activities: %s' % visitorDestination_entry.activities.all()
visitorDestination_entry.save()
success_url = reverse('visitor_detail', kwargs={'pk' : visitor_obj.pk})
return HttpResponseRedirect(success_url)
else:
visitorForm = VisitorForm(instance=visitor_obj)
# set up the visitor destination forms
destinationForms = []
for destination in Destination.objects.all():
visited = destination in visitorDestinations
destinationForms.append(VisitorDestinationForm(visitor_obj, destination, visited, prefix=destination.destination))
return render_to_response('testapp/edit_visitor.html', {'form': visitorForm, 'destinationForms' : destinationForms, 'visitor' : visitor_obj}, context_instance= RequestContext(request))
I simply collect my destination forms in a list and pass this list to my template, so that it can iterate over them and display them. It works well as long as you don't forget to pass a different prefix for each one in the constructor
I'll leave the question open for a few days in case some one has a cleaner method.
Thanks!
So, as you've seen, one of the things about inlineformset_factory is that it expects two models - a parent, and child, which has a foreign key relationship to the parent. How do you pass extra data on the fly to the form, for extra data in the intermediary model?
How I do this is by using curry:
from django.utils.functional import curry
from my_app.models import ParentModel, ChildModel, SomeOtherModel
def some_view(request, child_id, extra_object_id):
instance = ChildModel.objects.get(pk=child_id)
some_extra_model = SomeOtherModel.objects.get(pk=extra_object_id)
MyFormset = inlineformset_factory(ParentModel, ChildModel, form=ChildModelForm)
#This is where the object "some_extra_model" gets passed to each form via the
#static method
MyFormset.form = staticmethod(curry(ChildModelForm,
some_extra_model=some_extra_model))
formset = MyFormset(request.POST or None, request.FILES or None,
queryset=SomeObject.objects.filter(something=something), instance=instance)
The form class "ChildModelForm" would need to have an init override that adds the "some_extra_model" object from the arguments:
def ChildModelForm(forms.ModelForm):
class Meta:
model = ChildModel
def __init__(self, some_extra_model, *args, **kwargs):
super(ChildModelForm, self).__init__(*args, **kwargs)
#do something with "some_extra_model" here
Hope that helps get you on the right track.
From django 1.9, there is a support for passing custom parameters to formset forms :
https://docs.djangoproject.com/en/1.9/topics/forms/formsets/#passing-custom-parameters-to-formset-forms
Just add form_kwargs to your FormSet init like this :
from my_app.models import ParentModel, ChildModel, SomeOtherModel
def some_view(request, child_id, extra_object_id):
instance = ChildModel.objects.get(pk=child_id)
some_extra_model = SomeOtherModel.objects.get(pk=extra_object_id)
MyFormset = inlineformset_factory(ParentModel, ChildModel, form=ChildModelForm)
formset = MyFormset(request.POST or None, request.FILES or None,
queryset=SomeObject.objects.filter(something=something), instance=instance,
form_kwargs={"some_extra_model": some_extra_model})
Say I have django model that looks something like this:
class Order(models.Model):
number = models...
date = models...
class OrderLine(models.Model):
# One or more lines per order
order = models.ForeginKey(Order)
common_line = models.OneToOneField(CommonLine)
class CommonLine(models.Model):
# common elements of what might be on a line item...
taxes = model...
amount = model...
I want to create a form that uses an inlineformset to edit one or more Lines (both OrderLine and CommonLine) per order.
I can create a formset that works with Order and OrderLine - but how do I get the inline formset to give me all the detailed items from the CommonLine class when displaying the formset. It seems the documentation on inline formsets requires that the inline form - the multiple lines on an order can only map to a single class...
Am I not seeing something in the documentation? I'm sure I can probably override something, I'm just not sure where.
Thanks for any help...
I solved problem with http://yergler.net/blog/2009/09/27/nested-formsets-with-django/. Pleas use the following correction in forms.py file:
instance=None
pk_value = hash(form.prefix)
+ correct_data = None
+ if (self.data):
+ correct_data = self.data;
# store the formset in the .nested property
form.nested = [
- TenantFormset(data=self.data,
+ TenantFormset(data=correct_data,
instance = instance,
Just working on Django 1.4.1 very well.
Some minor changes were needed to make Nathan's code at http://yergler.net/blog/2009/09/27/nested-formsets-with-django/ work in Django 1.3. The line below causes a ManagementForm Error.
TenantFormset = inlineformset_factory(models.Building, models.Tenant, extra=1)
Usings the modelformset_factory and manually defining the queryset seems to work, but I have not implemented the ability to add extras.
TenantFormset = modelformset_factory(models.Tenant, extra=0)
form.nested = [
TenantFormset(
queryset = Tenant.objects.filter(building = pk_value),
prefix = 'value_%s' % pk_value
)
]
I also had to manually pass data to the sub-sub-forms in the is_valid method:
def is_valid(self):
result = super(BaseProtocolEventFormSet, self).is_valid()
for form in self.forms:
if hasattr(form, 'nested'):
for n in form.nested:
n.data = form.data
if form.is_bound:
n.is_bound = True
for nform in n:
nform.data = form.data
if form.is_bound:
nform.is_bound = True
# make sure each nested formset is valid as well
result = result and n.is_valid()
return result
EDIT:
New instances can be created using jQuery. See this question:
This sounds very similar to the approach talked about at help http://yergler.net/blog/2009/09/27/nested-formsets-with-django/ where Nathan writes about how he catered for "a multi-level data model; an example of this kind of model would be modeling City Blocks, where each Block has one or more Buildings, and each Building has one or more Tenants."
Some more explanations can aslo be found here Django Forms Newbie Question
I'm trying to write a method like the below where a list of fields (a subset of all the fields) is passed in as a parameter and has their column values set to null. I would be happy of I could get a method with just the fields as a parameter like below, but having the model as a parameter would be even better.
from my_project.my_app.models import MyModel
def nullify_columns (self, null_fields):
field_names = MyModel._meta.get_all_field_names()
for field in field_names:
if field in null_fields:
# The below line does not work because I'm not sure how to
# dynamically assign the field name.
MyModel.objects.all().update( (MyModel.get_field(field).column) = None)
Right now I have something like
if 'column1' in list_of_fields:
MyModel.objects.all().update(column1 = None)
if 'column2' in list_of_fields:
MyModel.objects.all().update(column2 = None)
etc. which is horrible, but works.
It's in the tutorial:
MyModel.objects.all().update(**dict.fromkeys(null_fields))