Can't disable select in ModelForm - django

In my ModelForm I need to disable ForeignKey field. I tried this thing but the select is still enabled and as I can see in html code attribute wasn't added to widget. Here's my code ModelForm code:
class ZayvkiAdminForm(ModelForm):
class Meta:
model = Zayvki
def __init__(self, *args, **kwargs):
if not kwargs.get('instance', None):
if not kwargs.get('initial', None):
kwargs['initial'] = {}
if not kwargs['initial'].get('nomer_zayvki', None):
kwargs['initial']['nomer_zayvki'] = get_request_number()
super(ZayvkiAdminForm, self).__init__(*args, **kwargs)
instance = getattr(self, 'instance', None)
if instance and instance.id:
self.fields['tipe_zayvki'].required = False
self.fields['tipe_zayvki'].widget.attrs['disabled'] = 'disabled'
self.fields['nomer_zayvki'].widget.attrs['readonly'] = True
UPDATE:
I can't use exclude or readonly attrs of ModelAdmin because I need user to be able to add something when he creates the object. But when the object is created, I wan't user just to see the value and not to edit it.

A MoedlAdmin can be the solution:
class CustomAdmin(admin.ModelAdmin):
readonly_fields = ('tipe_zayvki',)
also there is a method named get_readonly_fields here an example:
class CustomAdmin(admin.ModelAdmin):
def get_readonly_fields(self, request, obj=None):
if obj:
return ['tipe_zayvki']
else:
return []

Try specifying exclude as mentioned in the Django docs. This will remove the field from being rendered in the form, which is a cleaner UX than a disabled form input field.
So for your example:
class MyModelForm(ModelForm):
class Meta:
exclude = ('tipe_zayvki', )

Related

Django model form - Exclude a field that has no model field

I have a simple model form what I use through the admin interface. Some of my model fields store datas that require a bit more time to calculate (they come from other sites). So I decided to put an extra boolean field to the form to decide to crawl these datas again or not.
class MyModelForm(forms.ModelForm):
update_values = forms.BooleanField(required=False) #this field has no model field
class Meta:
model = MyModel
This extra field doesn't exist in the model because only the form needs it.
The problem is that I only want it to appear if it's an existing record in the database.
def __init__(self, *args, **kwargs):
super(MyModelForm, self).__init__(*args, **kwargs)
if self.instance.pk is None:
#remove that field somehow
I tried nearly everything. Exclude it, delete the variable but nothing wants to work. I also tried dynamically add the field if self.instance.pk is exists but that didn't work too.
Any idea how to do the trick?
Thanks for your answers.
You could subclass the form and add the extra field in the subclass:
class MyModelForm(forms.ModelForm):
class Meta:
model = MyModel
class MyUpdateModelForm(MyModelForm):
update_values = forms.BooleanField(required=False) #this field has no model field
class Meta:
model = MyModel
You can then override the get_form method of your admin, which is passed the current instance: get_form(self, request, obj=None, **kwargs)
Rather than removing the field in __init__ if instance.pk is not None, how about adding it if it is None? Remove the class-level declaration and just change the logic:
class MyModelForm(forms.ModelForm):
class Meta:
model = MyModel
def __init__(self, *args, **kwargs):
super(MyModelForm, self).__init__(*args, **kwargs)
if self.instance and self.instance.pk is not None:
self.fields['update_values'] = forms.BooleanField(required=False)

Django - MultipleCheckBoxSelector with m2m field - How to add object instead of save_m2m()

I use inlineformset_factory with a custom form option in order to change the queryset and the widget of a m2m field, ie: ezMap. I want the form to give the user the option to add or remove the current selected_map to the m2m field with CheckBoxSelectMultiple widget. However, I dont want to give the user the ability to remove other objects that were already there. The problem is when I save the formset with formset.save_m2m(), it overides the field and erase all objects that were already saved.
How could I just add a new object without erasing others?
models: (some of unecessary fields were removed)
class Shapefile(models.Model):
filename = models.CharField(max_length=255)
class EzMap(models.Model):
map_name = models.SlugField(max_length=50)
layers = models.ManyToManyField(Shapefile, verbose_name='Layers to display', null=True, blank=True)
class LayerStyle(models.Model):
styleName = models.SlugField(max_length=50)
layer = models.ForeignKey(Shapefile)
ezMap = models.ManyToManyField(EzMap)
forms:
class polygonLayerStyleFormset(forms.ModelForm):
add_to_map = forms.BooleanField(required=False)
def __init__(self, *args, **kwargs):
self.map_selected = kwargs.pop("map_selected", None)
super(polygonLayerStyleFormset, self).__init__(*args, **kwargs)
self.fields['conditionStyle'].help_text = "Put * if you want to select the entire table"
self.fields['ezMap'].widget = forms.CheckboxSelectMultiple()
self.fields['ezMap'].queryset = EzMap.objects.filter(id=self.map_selected.id)
self.fields['ezMap'].help_text =""
class Meta:
model = LayerStyle
def save(self, *args, **kwargs):
instance = super(polygonLayerStyleFormset, self).save(*args, **kwargs)
instance.add_to_map = self.cleaned_data['add_to_map']
return instance
ftlStylePolygonFormset = inlineformset_factory(Shapefile, LayerStyle, can_delete=True, extra=1, max_num=5,
fields = ['styleName', 'conditionStyle', 'fillColor', 'fillOpacity', 'strokeColor', 'strokeWeight', 'ezMap'], form=polygonLayerStyleFormset)
views:
def setLayerStyle(request, map_name, layer_id):
map_selected = EzMap.objects.get(map_name=map_name, created_by=request.user)
layer_selected = Shapefile.objects.get(id=layer_id)
layerStyle_selected = LayerStyle.objects.filter(layer=layer_selected)
styleFormset = ftlStylePolygonFormset
if request.POST:
formset = styleFormset(request.POST, instance=layer_selected)
if formset.is_valid():
instances = formset.save()
for instance in instances:
if instance.add_to_map:
instance.ezMap.add(map_selecte)
else:
instance.ezMap.remove(map_selected)
save_link = u"/ezmapping/map/%s" % (map_name)
return HttpResponseRedirect(save_link)
else:
formset = styleFormset(instance=layer_selected)
#set initial data for add_to_map
for form in formset:
if form.instance.pk:
if map_selected in form.instance.ezMap.all():
form.fields['add_to_map'].initial = {'add_to_map': True}
I am confused as to what you're doing with the ezMap form field. You set its queryset to a single-element list, then use a CheckboxSelectMultiple widget for it. Are you setting up to let the user deselect that matching map, but not add new ones?
To do this at initialization, you need to define a custom base formset class and pass that in as the formset argument to your factory.
from django.forms.models import BaseInlineFormSet
class polygonLayerStyleForm(forms.ModelForm):
def __init__(self, *args, **kwargs):
self.map_selected = kwargs.pop("map_selected", None)
super(polygonLayerStyleForm, self).__init__(*args, **kwargs)
self.fields['conditionStyle'].help_text = "Put * if you want to select the entire table"
self.fields['ezMap'].widget = forms.CheckboxSelectMultiple()
self.fields['ezMap'].queryset = EzMap.objects.filter(id=self.map_selected.id)
self.fields['ezMap'].help_text =""
class Meta:
model = LayerStyle
class polygonLayerStyleFormset(BaseInlineFormSet):
def __init__(self, *args, **kwargs):
self.map_selected = kwargs.pop("map_selected", None)
super(polygonLayerStyleFormset, self).__init__(*args, **kwargs)
def _construct_form(self, i, **kwargs):
kwargs['map_selected'] = self.map_selected
return super(polygonLayerStyleFormset, self)._construct_form(i, **kwargs)
ftlStylePolygonFormset = inlineformset_factory(Shapefile, LayerStyle, formset=polygonLayerStyleFormset, form=polygonLaterStyleForm, # and other arguments as above
)
It might be simpler to just go through the formset forms and directly change the field's queryset after creating it in your view:
formset = ftlStylePolygonFormset(instance=layer_selected)
for form in formset.forms:
form.fields['ezMap'].queryset = EzMap.objects.filter(id=map_selected.id)
Speaking of which, the usual convention is to split the POST and GET cases in the view:
from django.shortcuts import render
def setLayerStyle(request, map_name, layer_id):
map_selected = EzMap.objects.get(map_name=map_name, created_by=request.user)
layer_selected = Shapefile.objects.get(id=layer_id)
layerStyle_selected = LayerStyle.objects.filter(layer=layer_selected)
if request.method == 'POST':
formset = ftlStylePolygonFormset(request.POST, instance=layer_selected, map_selected=map_selected)
if formset.is_valid():
instances = formset.save()
save_link = u"/ezmapping/map/%s" % (map_name)
return HttpResponseRedirect(save_link)
else:
formset = ftlStylePolygonFormset(instance=layer_selected, map_selected=map_selected)
return render(request, "ezmapping/manage_layerStyle.html", {'layer_style': layerStyle_selected, 'layerStyleformset': formset, 'layer': layer_selected})
And it's better to use the redirect shortcut to reverse lookup a view for your redirect on success rather than hardcode the target URL. And to use get_object_or_404 or some equivalent when accessing objects based on URL arguments - right now a bogus URL will trigger an exception and give the user a 500 status error, which is undesirable.
To conditionally add to the ezMap relationship:
class polygonLayerStyleForm(forms.ModelForm):
add_to_map = forms.BooleanField()
def save(self, *args, **kwargs):
instance = super(polygonLayerStyleForm, self).save(*args, **kwargs)
instance.add_to_map = self.cleaned_data['add_to-map']
return instance
Then in the view:
instances = formset.save()
for instance in instances:
if instance.add_to_map:
instance.ezMap.add(map_selected)
You could also do the add call in the save method, but then you'd have to set the map as member data sometime previously - and more importantly, deal with the commit=False case.

ModelMultipleChoiceField passing request.user

I want to use forms.ModelMultipleChoiceField in a form. I know it takes a queryset, however the query set I will be using take the param user which I normally pass in a view using request.user. However this is in a form, how do I pass request.user? do I need to?
Entry.objects.filter(request.user)
You should override your form's init method:
class MyForm(forms.ModelForm):
class Meta:
model = Entry
def __init__(self, user=None, *args, **kwargs):
super(MyForm, self).__init__(*args,**kwargs)
if user is not None:
form_choices = Entry.objects.filter(user)
else:
form_choices = Entry.objects.all()
self.fields['my_mfield'] = forms.ModelMultipleChoiceField(
queryset=form_choices
)
and in your views, when it's time to instantiate the form:
form = MyForm(request.user)
or
form = MyForm()

CBV Django Form View set data for ChoiceField

I'm using the Django Form View and I want to enter custom choices per user to my Choicefield.
How can I do this?
Can I use maybe the get_initial function?
Can I overwrite the field?
When I want to change certain things about a form such as the label text, adding required fields or filtering a list of choices etc. I follow a pattern where I use a ModelForm and add a few utility methods to it which contain my overriding code (this helps keep __init__ tidy). These methods are then called from __init__ to override the defaults.
class ProfileForm(forms.ModelForm):
class Meta:
model = Profile
fields = ('country', 'contact_phone', )
def __init__(self, *args, **kwargs):
super(ProfileForm, self).__init__(*args, **kwargs)
self.set_querysets()
self.set_labels()
self.set_required_values()
self.set_initial_values()
def set_querysets(self):
"""Filter ChoiceFields here."""
# only show active countries in the ‘country’ choices list
self.fields["country"].queryset = Country.objects.filter(active=True)
def set_labels(self):
"""Override field labels here."""
pass
def set_required_values(self):
"""Make specific fields mandatory here."""
pass
def set_initial_values(self):
"""Set initial field values here."""
pass
If the ChoiceField is the only thing you're going to be customising, this is all you need:
class ProfileForm(forms.ModelForm):
class Meta:
model = Profile
fields = ('country', 'contact_phone', )
def __init__(self, *args, **kwargs):
super(ProfileForm, self).__init__(*args, **kwargs)
# only show active countries in the ‘country’ choices list
self.fields["country"].queryset = Country.objects.filter(active=True)
You can then make your FormView use this form with like this:
class ProfileFormView(FormView):
template_name = "profile.html"
form_class = ProfileForm

Django admin - remove field if editing an object

I have a model which is accessible through the Django admin area, something like the following:
# model
class Foo(models.Model):
field_a = models.CharField(max_length=100)
field_b = models.CharField(max_length=100)
# admin.py
class FooAdmin(admin.ModelAdmin):
pass
Let's say that I want to show field_a and field_b if the user is adding an object, but only field_a if the user is editing an object. Is there a simple way to do this, perhaps using the fields attribute?
If if comes to it, I could hack a JavaScript solution, but it doesn't feel right to do that at all!
You can create a custom ModelForm for the admin to drop the field in the __init__
class FooForm(forms.ModelForm):
class Meta(object):
model = Foo
def __init__(self, *args, **kwargs):
super(FooForm, self).__init__(*args, **kwargs)
if self.instance and self.instance.pk:
# Since the pk is set this is not a new instance
del self.fields['field_b']
class FooAdmin(admin.ModelAdmin):
form = FooForm
EDIT: Taking a hint from John's comment about making the field read-only, you could make this a hidden field and override the clean to ensure the value doesn't change.
class FooForm(forms.ModelForm):
class Meta(object):
model = Foo
def __init__(self, *args, **kwargs):
super(FooForm, self).__init__(*args, **kwargs)
if self.instance and self.instance.pk:
# Since the pk is set this is not a new instance
self.fields['field_b'].widget = forms.HiddenInput()
def clean_field_b(self):
if self.instance and self.instance.pk:
return self.instance.field_b
else:
return self.cleaned_data['field_b']
You can also do the following
class FooAdmin(admin.ModelAdmin)
def change_view(self, request, object_id, extra_context=None):
self.exclude = ('field_b', )
return super(SubSectionAdmin, self).change_view(request, object_id, extra_context)
Taken from here Django admin: exclude field on change form only