Re: Working with a Custom, Dynamic Form (using BaseForm)

[Nick_B]

Thanks for the advice Anton,


> looks like you are using some additional layer before django.forms and 
> don't just create fields directly, so you may need to extend it too.
>  
>

Does anyone have any advice or references on extending my form to include 
an extra field? After searching and reading for days, I'm still lost on how 
to make it happen?


Thanks!
Nick_B 

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Re: Working with a Custom, Dynamic Form (using BaseForm)

[Anton Baklanov]

>
>
>
> I am hoping to add an additional field, "Photographers" (from the
> 'Photographer' model) to AForm so that users can select a Photographer to
> become part of an instance of the 'A' model.
>
> Does that make sense?
>

yes, you need to add field and I'm guessing that ModelChoiceField will work
for you.
https://docs.djangoproject.com/en/dev/ref/forms/fields/#modelchoic
efield

looks like you are using some additional layer before django.forms and
don't just create fields directly, so you may need to extend it too.


>
>
> Thank you very much for any ideas!
>
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Regards,
Anton Baklanov

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Re: Working with a Custom, Dynamic Form (using BaseForm)

[Nick_B]

Here are my models, if you are interested:

class Photographer(models.Model):
name = models.CharField(max_length=20)
models = models.ManyToManyField('Model')

class Model(models.Model):
model = models.CharField(max_length=20, blank=False)
series = models.ForeignKey('Series', null=True, blank=True)

class A(models.Model):
user = models.ForeignKey(User)
photographer = models.ForeignKey('Photographer', blank=True, 
null=True)
model = models.ForeignKey('Model', blank=True, null=True)



Thanks folks

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Re: Working with a Custom, Dynamic Form (using BaseForm)

[Nick_B]

Hi Anton,

Thank you very much for your response. The 'fields_for_a' is generating the 
form fields for the instance of the model 'A'. The author admits that it 
might not be the prettiest implementation, but fully functional. 


def fields_for_a(instance):
# generate a sorted dict of fields corresponding to the Field model
# for the A instance
fields_dict = SortedDict()
fields = field_list(instance)
# this really, really should be refactored
for field in fields:
if field.field_type == Field.BOOLEAN_FIELD:
fields_dict[field.name] = forms.BooleanField(label=field.label, 
required=False, help_text=field.help_text)
elif field.field_type == Field.CHAR_FIELD:
widget = forms.TextInput
fields_dict[field.name] = forms.CharField(label=field.label, 
required=field.required, max_length=field.max_length, 
help_text=field.help_text, widget=widget)

.(etc)

 fields_dict[field.name] = field_type(label=field.label,
 required=field.required,
 help_text=field.help_text,

 max_length=field.max_length,
 widget=widget)

return fields_dict


I am hoping to add an additional field, "Photographers" (from the 
'Photographer' model) to AForm so that users can select a Photographer to 
become part of an instance of the 'A' model.

Does that make sense?


Thank you very much for any ideas!

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Re: Working with a Custom, Dynamic Form (using BaseForm)

[Anton Baklanov]

what is going on here:
self.base_fields = fields_for_a(self.instance) ?



On Tue, Jul 31, 2012 at 8:14 PM, Nick_B  wrote:

> Hi,
>
> Have hit a huge roadblock trying to implement a custom, dynamic form into
> my django project. Although I am more familiar with using ModelForms, I
> need to use BaseForm to work with the structure I already have in place.
>
> I have a dictionary of objects inside of my Model 'Photographer' that I am
> trying to pass into my form. The objects from 'Photographer' will be a drop
> down option for the user to select from, then will become part of an
> instance of another model 'A' after the user submits the form. I cannot
> figure out how to include the objects from 'Photographer' into my form,
> given the following form structure:
>
> class AForm(BaseForm):
> def __init__(self, data=None, files=None, instance=None,
> auto_id='id_%s',
>  prefix=None, initial=None, error_class=ErrorList,
>  label_suffix=':', empty_permitted=False):
>
> if not instance:
> raise NotImplementedError("Instance must be provided")
>
> self.instance = instance
> object_data = self.instance.fields_dict()
> self.declared_fields = SortedDict()
> self.base_fields = fields_for_a(self.instance)
>
> # if initial was provided, it should override the values from
> instance
> if initial is not None:
> object_data.update(initial)
>
> BaseForm.__init__(self, data, files, auto_id, prefix,
> object_data,
>   error_class, label_suffix, empty_permitted)
>
> cleaned_data = self.cleaned_data
>
> # save fieldvalues for self.instance
> fields = field_list(self.instance)
>
> for field in fields:
> if field.enable_wysiwyg:
> value = unicode(strip(cleaned_data[field.name]))
> else:
> value = unicode(cleaned_data[field.name])
>
> return self.instance
>
> For a more full representation of the problem in general, including all of
> the models and a lot of the view code, please see my stack overflow
> question:
> http://stackoverflow.com/questions/11548992/adding-values-to-complex-django-view
> .
>
> I cannot thank you enough for any advice given. I have been struggling
> with this issue for over a month, sadly. I appreciate any commentary.
>
>
> Thank you!
>
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> You received this message because you are subscribed to the Google Groups
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>



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Regards,
Anton Baklanov

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Working with a Custom, Dynamic Form (using BaseForm)

[Nick_B]

Hi,

Have hit a huge roadblock trying to implement a custom, dynamic form into 
my django project. Although I am more familiar with using ModelForms, I 
need to use BaseForm to work with the structure I already have in place.

I have a dictionary of objects inside of my Model 'Photographer' that I am 
trying to pass into my form. The objects from 'Photographer' will be a drop 
down option for the user to select from, then will become part of an 
instance of another model 'A' after the user submits the form. I cannot 
figure out how to include the objects from 'Photographer' into my form, 
given the following form structure:

class AForm(BaseForm):
def __init__(self, data=None, files=None, instance=None, 
auto_id='id_%s',
 prefix=None, initial=None, error_class=ErrorList,
 label_suffix=':', empty_permitted=False):

if not instance:
raise NotImplementedError("Instance must be provided")

self.instance = instance
object_data = self.instance.fields_dict()
self.declared_fields = SortedDict()
self.base_fields = fields_for_a(self.instance)

# if initial was provided, it should override the values from 
instance
if initial is not None:
object_data.update(initial)

BaseForm.__init__(self, data, files, auto_id, prefix, 
object_data,
  error_class, label_suffix, empty_permitted)

cleaned_data = self.cleaned_data

# save fieldvalues for self.instance
fields = field_list(self.instance)

for field in fields:
if field.enable_wysiwyg:
value = unicode(strip(cleaned_data[field.name]))
else:
value = unicode(cleaned_data[field.name])

return self.instance

For a more full representation of the problem in general, including all of 
the models and a lot of the view code, please see my stack overflow 
question: 
http://stackoverflow.com/questions/11548992/adding-values-to-complex-django-view.
 

I cannot thank you enough for any advice given. I have been struggling with 
this issue for over a month, sadly. I appreciate any commentary.


Thank you!

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