Django - get value of readonly field (fix readonly error) - django

Question

I'm trying to edit fieldset.html template in order to add the hidden input under readonly div (in readonly case).
{% if field.is_readonly %}
<div class="readonly {% if field.field.name %} field-{{ field.field.name }}{% endif %}">{{ field.contents }}</div>
<input id="{% if field.field.name %} id-{{ field.field.name }}{% endif %}" type="hidden" value="{{ field.field.initial }}"/>
{% else %}
{{ field.field }}
{% endif %}
My problem is that if I set a field readonly with "get_readonly_fields", I can't submit the form because hidden field is required (I think this is a big error of django that uses div instead of the hidden input).
I tried to fix it with the code above but I'am not able to insert the value in to my field, because "field.field.initial" is empty for readonly field. How can I solve it?
UPDATE
My form.py:
class MyModelAdminForm(forms.ModelForm):
val1 = forms.CharField()
val2 = forms.ModelChoiceField(queryset=User.objects.filter(groups__name='Group1'))
val3 = forms.CharField(widget=forms.DateInput(attrs={'type': 'date'}))
class Meta:
model = MyModel
fields = ('val1', 'val2', 'val3')
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
for field in self._meta.fields:
attrs = {'class':'form-control'}
self.fields[field].widget.attrs.update(attrs)
My admin.py
class CampaignAdmin(admin.ModelAdmin):
def get_form(self, request, obj=None, **kwargs):
return MyModelAdminForm
def get_fieldsets(self, request, obj=None):
return [
(None, {'fields': ['val1', 'val2']}),
('Informations', {'fields': ['val3']}),
]
def get_readonly_fields(self, request, obj=None):
if obj:
return self.readonly_fields + ('val2',)
else:
return self.readonly_fields
I need that val2 is in readonly mode in edit page.

Answer 1

In general, you can add any fields to your form as you see fit. So, if you need the field to show up as read-only as well as a hidden field, you can just add two fields. You should name the hidden field correctly so that saving works. You can use label to change the label of the read-only field (https://docs.djangoproject.com/en/1.11/ref/forms/fields/#label).
EDIT - solution for your code:
For your solution, if you change the form to have val2 as readonly field instead of a regular field, you also need to change the form's Meta.fields setting from:
fields = ('val1', 'val2', 'val3')
to
fields = ('val1', 'val3')
Otherwise, the validators for val2 will run.
Or, you have to change the widget of val2 to HiddenInput and add its value as readonly_field using a different name with an explicit method in your django admin class. But that would require changing the fieldsets depending on the mode (edit or create).