how to get initial data on the extra forms - django

i've got multiple forms, which i want to pull the same initial data into specific fields
but only the first formset is doing the job but the rest come blank
also note that CustomerForm is a modelform
CustomerFormset = formset_factory(CustomerForm, extra=2)
form = CustomerFormset(initial=[{'Location':'USA', 'age': 10} ])
context = { 'form':form }
return render(request,"Customermanager/SubProcess.html",context)
so when the form loads... all the rest of the extra COME BLANK!
i want both my intial plus extra to have the same data
if i can get some code how to do it. ill beable to fill in the rest

In order to set different initial values for each form in a formset including the extra forms, you have to pass a list of dictionaries containing the initial data for each form to be rendered.
Something like the following would do :
Formset = formset_factory(CustomerForm, extra=2)
formset = FormSet(initial=[{'Location':'USA', 'age': 10} for x in range(3)])
You might also be interested in This.

Related

Can you use a Django form multiple times in one view?

I have a Django view that uses one form multiple times. The form is just a boolean field form that is supposed to initialize to True but then the user can decide to uncheck the boxes or not.
The problem I'm having is that the all of the fields evaluate to True no matter what the user leaves checked. Is this a problem with using the same form multiple times, or did I mess something else up?
The form looks like this:
class DataTypeForm(forms.Form):
def __init__(self,*args,**kwargs):
section_label = kwargs.pop('section_label')
initial_value = kwargs.pop('initial_value')
super(DataTypeForm,self).__init__(*args,**kwargs)
self.fields['dataType'].label=mark_safe(section_label)
self.fields['dataType'].initial=initial_value
self.fields['dataType'].required=False
dataType = forms.BooleanField(required=False)
This is the view:
def Manual_Request(request):
form_dict = {}
arg_dict = {}
message = message = {'last_url':'Nominal_Request'}
if request.method == 'POST':
logger.info("Query submitted, beginning query results render for:")
form_NOM = DataTypeForm(request.POST or None,section_label="ENG_NOM",initial_value=True)
form_DDM = DataTypeForm(request.POST or None,section_label="SCI_DDM",initial_value=True)
form_RAW = DataTypeForm(request.POST or None,section_label="SCI_RAW",initial_value=False)
if form_NOM.is_valid():
NOM = form_NOM.cleaned_data['dataType']
arg_dict.update({'ENG_NOM':str(NOM)})
logger.info("ENG_NOM: {val}".format(val=NOM))
if form_DDM.is_valid():
DDM = form_DDM.cleaned_data['dataType']
arg_dict.update({'SCI_DDM':str(DDM)})
logger.info("SCI_DDM: {val}".format(val=DDM))
if form_RAW.is_valid():
RAW = form_RAW.cleaned_data['dataType']
arg_dict.update({'SCI_RAW':str(RAW)})
logger.info("SCI_RAW: {val}".format(val=RAW))
return Request_Results(request,args_dict)
else:
logger.info("Rendering query page")
form_NOM = DataTypeForm(section_label="ENG_NOM",initial_value=True)
form_DDM = DataTypeForm(section_label="SCI_DDM",initial_value=True)
form_RAW = DataTypeForm(section_label="SCI_RAW",initial_value=True)
form_dict.update({'form_NOM':...etc})
return render(request,'InterfaceApp/COMMRequest_Manual.html',form_dict)
Help much appreciated!
I haven't run your code, but my best guess is that yes, it's a problem with using the same form multiple times in the same view. The reason? All of your <input type="checkbox" name="..." ... /> tags will have the same name, 'dataType'. The user's browser knows nothing of your back-end, and will just send, for example, dataType=on&dataType=on as POST data for the three fields if two are checked and one is not.
Seeing the problem here? How is django supposed to know which of those dataType fields are for your NOM, DDM, or RAW forms? It can't know.
You should be able to solve this using form prefixes. In short, there's a kwarg that you can pass to a form's __init__() that will cause a prefix to be added to all of the form items in the rendered HTML. So, for example:
form_NOM = DataTypeForm(request.POST or None, section_label="ENG_NOM",
initial_value=True, prefix="NOM")
form_DDM = DataTypeForm(request.POST or None, section_label="SCI_DDM",
initial_value=True, prefix="DDM")
form_RAW = DataTypeForm(request.POST or None, section_label="SCI_RAW",
initial_value=False, prefix="RAW")
Hope that helps!
This is exactly what Django formsets are for. They allows you to create a set of the same type of form. It handles prefixes, and adds a management form so that Django doesn't get confused as to what data comes from what form.
https://docs.djangoproject.com/en/1.8/topics/forms/formsets/

Django: How can I set initial values to formset's empty_form?

I just want to know how can I set initial values to empty_form.
I do create the Inlines with initial values for extra forms without problem, but, when user clicks to Add button, the fields I expect it have the initial values show up empty, and I hope it have the same initial values than extra forms.
How could I make the empty_form to be filled with initial data?
Thanks in advance.
Django doesn't really provide a way to set initial values for empty forms. I've found a couple ways to work around this:
Set the field values dynamically in javascript.
Overwrite the empty_form property for your formset.
example:
formset = formset_factory(MyClass, **kwargs)
empty = formset.empty_form
# empty is a form instance, so you can do whatever you want to it
my_empty_form_init(empty_form)
formset.empty_form = empty_form
I had a similar problem and what finally worked for me was using Django Dynamic Formset. What DDF does is instead of using the empty form to create the new formset, it uses one of the extra_forms as a template. The default behavior is to clear all field values from the extra_form before inserting the HTML to the DOM, but you can use the keepFieldValues setting to specify the ones you want to keep.
In my case I wanted to keep all hidden field values:
$(function() {
$('#myForm_table tbody tr').formset({
keepFieldValues: 'input:hidden',
}
});
});
Of course you can bypass Django Dynamic Formsets and implement your own add/delete code with Javascript if you prefer.
Accepted answer didn't work for me, hopefully this will help someone in the future, this is my solution:
Create a new class based on BaseInlineFormSet
Override empty_form
Create a FormSet with inlineformset_factory(formset=YourBaseInlineFormSet)
Create a formset instance and pass parameters to initial on the formset instance
Add the field on the HTML as usual
I used BaseInlineFormSet, but probably will work with other types of FormSet
verification is the name of the field for my example.
forms.py
class YourBaseInlineFormSet(forms.BaseInlineFormSet):
#property
def empty_form(self): # This is almost the same as Django 3.1 code
form = self.form(
auto_id=self.auto_id,
prefix=self.add_prefix("__prefix__"),
empty_permitted=True,
use_required_attribute=False,
initial={"verification": self.initial_extra[0]["verification"]}, # This is the extra parameter
**self.get_form_kwargs(None),
)
self.add_fields(form, None)
return form
YourFormSet = forms.inlineformset_factory(
SomeObject,
SomeRelatedObject,
fields="__all__",
widgets={"verification": forms.HiddenInput},
formset=YourBaseInlineFormSet,
)
views.py
from .forms import YourFormSet
def your_view(request):
formset = YourFormSet(
data=request.POST or None,
instance=object,
queryset=object.related_objects.all()
initial=[{"verification": verification} for a in range(FormSet().total_form_count())],
)
return render(request, template, context={'formset': formset})
template.html
<div id="empty_form" style="display:none">
{{ formset.empty_form }}
</div>
Working on Django 3.1
There is at least one way to do this: Specify the default value on your model Field.
Of course, this may have side effects, depending on your implementation of the model.
As #jkk-jonah mentioned, BaseFormSet does not provide a way to set initial values in the empty_form. However, a small change can provide a simple solution.
The following provides a way to supply the FormSet instance with empty initial values without disrupting its base behavior.
from django.forms.formsets import BaseFormSet
class FormSetWithDefaultEmptyFormInitials(BaseFormSet):
"""This formset enables you to set the initial values in ``empty_form``.
Usage: ``formset_factory(..., formset=FormSetWithDefaultEmptyFormInitials)``
"""
def __init__(self, *args, **kwargs):
if 'empty_initial' in kwargs:
self._empty_initial = kwargs.pop('empty_initial')
super().__init__(*args, **kwargs)
def get_form_kwargs(self, index):
"""Augmented to return the empty initial data
when the index is ``None``,
which is the case when creating ``empty_form``.
"""
if index is None:
kwargs = self.form_kwargs.copy()
if self._empty_initial:
# Assign the initial value passed to the Form class.
kwargs['initial'] = self._empty_initial
else:
kwargs = super().get_form_kwargs(index)
return kwargs
Then to use this you'd do something like:
NonEmptyFormSet = formset_factory(
BringYourOwnForm,
min_num=1,
extra=1,
formset=FormSetWithDefaultEmptyFormInitials,
)
# Let's say your form has name and address fields...
empty_form_initial_values = {'name': 'default name', 'address': 'default address'}
formset = NonEmptyFormSet(empty_initial=empty_form_initial_values)
asset formset.empty_form.initial == empty_form_initial_values
In my implementation empty_form is used to provide a template for frontend javascript to add additional forms to the formset. Thus, this allows me to set the initial values for that all of the forms in that formset.
Note, this does not take the place of initial values to the minimum number of forms within the formset (e.g. formset_factory(min_num=2, ...)). Therefore, it is necessary to assign those through the standard initial keyword argument.
Tested with Django 3.2.
See also the standard implementation of get_form_kwargs.
This partially extends the answer given by #RobertPro. Or at least, I used their answer as the stepping stone to my own solution.

Passing MultiValueDict to Django ModelForm

I'm working with a ModelForm and passing data that was stored in the DB using a MultiValueDict that holds the original post data, in the form of u'first_name': [u'XX'], u'last_name': [u''] and such, but the form renders the value completely to the actual field, including [u''] wrapping the rest.
If I try to pass the same MultiValueDict to a regular Form, I don't get this problem.
I'm clueless on how to handle the dictionary or to process the data before assigning it as the initial value.
Edit:
Code that gets the data from post and restores it to the form
if request_post_data is not None:
self.form = self.FORM_CLASS(data=request_post_data)
self.draft.raw_data = dict(request_post_data) # preserves multiple values per key
self.draft.save()
else:
# conversion to MultiValueDict restores multiple values per key
self.form = self.FORM_CLASS(initial=MultiValueDict(self.draft.raw_data) if self.draft.raw_data else None)`
request_post_data comes from a serialized field in the db and an actual value looks like this:
<MultiValueDict: {u'last_name': [u''], u'suffix': [u''], u'prefix': [u''], u'first_name': [u'XX'], u'middle_name': [u'']}>
which ends up showing in my forms like this (when sent to ModelForm):
Actual form
Thanks for your help!
In order to instantiate a form with an instance and the provided POST query dict you can do the following in your view:
project = get_object_or_404(Project.objects, pk=project_id)
projectForm = ProjectForm(request.POST,
instance=project)
In order to provide some initial values you have to provide the initial values in a dictionary using the initial keyword argument.
projectForm = ProjectForm(initial={'name': 'my first project'})

Help understanding a Django view

I am trying to follow the code listed on https://github.com/alex/django-ajax-validation/blob/master/ajax_validation/views.py
I have been able to understand a small chunk of it. I have added comments stating my understanding of what is happening.
I would really appreciate some assistance on questions I listed in comments next to the lines I couldn't quite follow.
def validate(request, *args, **kwargs):
# I thing it is some sort of initializations but I cannot really understand what's happening
form_class = kwargs.pop('form_class')
defaults = {
'data': request.POST
}
extra_args_func = kwargs.pop('callback', lambda request, *args, **kwargs: {})
kwargs = extra_args_func(request, *args, **kwargs)
defaults.update(kwargs)
form = form_class(**defaults)
if form.is_valid(): #straightforward, if there is no error then the form is valid
data = {
'valid': True,
}
else:
# if we're dealing with a FormSet then walk over .forms to populate errors and formfields
if isinstance(form, BaseFormSet): #I cannot really understand what is BaseFromSet
errors = {}
formfields = {}
for f in form.forms: # I am guessing that this is for when there are multiple form submitted for validation
for field in f.fields.keys(): # I think he is looping over all fields and checking for error. what does add_prefix () return? and what is formfields[]?
formfields[f.add_prefix(field)] = f[field]
for field, error in f.errors.iteritems():
errors[f.add_prefix(field)] = error
if form.non_form_errors():
errors['__all__'] = form.non_form_errors() # what is the '__all__'?
else:
errors = form.errors
formfields = dict([(fieldname, form[fieldname]) for fieldname in form.fields.keys()])
# if fields have been specified then restrict the error list
if request.POST.getlist('fields'): # I am having a hard time understanding what this if statement does.
fields = request.POST.getlist('fields') + ['__all__']
errors = dict([(key, val) for key, val in errors.iteritems() if key in fields])
final_errors = {} # here the author of this code totally lost me.
for key, val in errors.iteritems():
if '__all__' in key:
final_errors[key] = val
elif not isinstance(formfields[key].field, forms.FileField):
html_id = formfields[key].field.widget.attrs.get('id') or formfields[key].auto_id
html_id = formfields[key].field.widget.id_for_label(html_id)
final_errors[html_id] = val
data = {
'valid': False or not final_errors,
'errors': final_errors,
}
json_serializer = LazyEncoder() # Why does the result have to be returned in json?
return HttpResponse(json_serializer.encode(data), mimetype='application/json')
validate = require_POST(validate) # a decorator that requires a post to submit
LazyEncoder
class LazyEncoder(JSONEncoder):
def default(self, obj):
if isinstance(obj, Promise):
return force_unicode(obj)
return obj
form_class = kwargs.pop('form_class')
This is simply pulling the keyword argument, form_class, that was passed in via the URL conf.
(r'^SOME/URL/$', 'ajax_validation.views.validate',
{'form_class': ContactForm}, # this keyword argument.
'contact_form_validate')
BaseFormSet is simply the formset class doing the work behind the scenes. When you don't know, search the source! grep -ri "baseformset" . It's an invaluable tool.
Take a look at at django.forms.formsets to see how formset_factory produces new "formset" classes based on the BaseFormSet, hence the factory part!
I am guessing that this is for when there are multiple form submitted for validation
Yes, that's exactly what a formset is for (dealing with multiple forms)
I think he is looping over all fields and checking for error. what does add_prefix () return? and what is formfields[]?
Yes, that would be looping through the field names.
add_prefix() is for prefixing form field names with a specific form. Because a formset repeats form elements multiple times, each field needs a unique prefix, such as 0-field1, 1-field1, etc.
formfields is just an empty dictionary defined a few lines above.
what is the 'all'?
__all__ is defined at the top of django.forms.forms
NON_FIELD_ERRORS = '__all__'
It's just what non field specific errors (such as constraints across 2 fields) are stored under in the errors dictionary as opposed to errors[fieldname].
I am having a hard time understanding what this if statement does.
The author has left a note:
# if fields have been specified then restrict the error list
if request.POST.getlist('fields'):
It's checking if you specified any specific fields to validate in your URLConf, this is not django but ajax_validation.
You can see that he's overwriting his errors dictionary based on only the fields specified, thus passing on the validation only for those fields.
errors = dict([(key, val) for key, val in errors.iteritems() if key in fields])
here the author of this code totally lost me.
The author has mapped a custom errors and fields dictionary to specific field names with prefixes, (as opposed to the usual FormSet with each form having its own errors dictionary, unaware of the formset itself) which he presumably uses in the AJAX response to validate all fields.
Normally, you can iterate over a formset and go through the errors on a form by form basis, but not so if you need to validate all of them through ajax.
The line pulling html_id should be straight forward most of the time, but it's there because form widgets CAN add interesting things to the end of the ID's based on whether or not the widget is a radio select for example.
From source comments :
# RadioSelect is represented by multiple <input type="radio"> fields,
# each of which has a distinct ID. The IDs are made distinct by a "_X"
# suffix, where X is the zero-based index of the radio field. Thus,
# the label for a RadioSelect should reference the first one ('_0').
Why does the result have to be returned in json?
Because it's an ajax request and javascript easily eats json.
2- could you go through these lines of code...
extra_args_func = kwargs.pop('callback', lambda request, *args, **kwargs: {})
Either return a keyword argument named 'callback' (which if passed in, is supposed to be a function that accepts request and return a dictionary), and if it wasn't, return a lambda function that only returns an empty dictionary.
I'm not sure what the specific use is for the extra context. You could use it to run arbitrary snippets of code without modifying or subclassing ajax_validation...
It might help you to run this code, and put a debugger breakpoint in somewhere so you can step through and examine the variables and methods. You can do this by simply putting this line where you want to break:
import pdb; pdb.set_trace()
and you will be dumped into the debugger in the console.

Best way to handle request variables in Django

I have a form 'in the wild' that takes many different variables - which may or may not be populated.
try:
app_version = request.REQUEST["appVersion"]
except:
app_version = ''
try:
app_name = request.REQUEST["appName"]
except:
app_name = ''
try:
app_code_name = request.REQUEST["appCodeName"]
except:
app_code_name = ''
Is there a tighter way to accomplish this?
app_version = request.REQUEST.get("appVersion", "")
get(key, default) is a method implemented on Python dicts. If the key exists in the dictionary, its value is returned; if the key does not exist, the specified default value is returned. In Django, request objects are dictionary-like objects, so get is also defined for them in the same manner.
If these variables are intended to populate a form, then you can safely pass the request.POST object directly into the form constructor.
if request.method == 'POST':
form = MyForm(request.POST)
The form will automatically pass the correct values to the correct form fields and use defaults for keys that don't exist and will still create blank fields for missing keys (see addendum).
If you are trying to process a form, it is still better to create a form object as above, and read out the values from that object.
if request.method == 'POST':
form = MyForm(request.POST)
if form.is_valid():
# You may process these variables here
print form.appVersion
print form.appName
print form.appCodeName
Remember, validation code is best placed in the form class as well. That way, if form.is_valid() returns True, then you know you have a clean dataset to work with.
Note: Django docs recommend using request.POST or request.GET directly rather than the amalgamated variable request.REQUEST, as it is more explicit.
Addendum:
It is important to understand the difference between bound and unbound forms in this case. If you create an unbound form with form = MyForm(), then when the form is instantiated, it will fill in all fields with the initial property of each field (if it exists). For example, with this code:
from django import forms
class MyForm(forms.Form):
appVersion = forms.CharField(initial='1.0')
appName = forms.CharField()
appCodeName = forms.CharField()
the form will be initialized with appVersion having a value of '1.0'. However, if you bind a POST request to a form like this: form = MyForm(request.POST), then the initial properties are ignored. That means if the POST dict does not include an appVersion key, then that field will be left blank. As long as the field is not required, your form will still validate, and you can modify form.appVersion in the view after validation.
If you have many fields, a more compact version might be:
defaults = { 'field1' : 'val1', 'field2' : 'val2', ...}
defaults.update(request.POST)