Hi
I am trying to achieve the following effect:
A ModelForm containing list of choices and input to possibly add
another
element to the list is presented on page.
If user will not choose any item from list and will type something
into
new_item field, then:
- if new_item is present on the list, ValidationError should be
raised and
user should choose item from list instead of creating new one, but i
also
want to make this item selected on the list (problem 1)
- if new_item is not on the list, then i want to add it to the list
and
set as model instance property (problem 2)
problem 1: i don't know how to modify modelform during or before/after
validation.
problem 2: basically the same
and there is also problem 3: i want access request.user during
validation.
Is it possible?
Thanks for help
my model:
class Song(models.Model):
"""
Song
"""
title = models.CharField(max_length = 500, blank = False)
user = models.ForeignKey(User)
author = models.ForeignKey(Author)
category = models.ForeignKey(Category)
content = models.TextField(blank = True)
format = models.CharField(max_length = 50, choices = SONG_FORMATS)
creationdate = models.DateTimeField(auto_now_add = True)
my form:
class SongEditForm(ModelForm):
class Meta:
model = songs_models.Song
exclude = ('user')
new_author = forms.CharField(max_length=100, required = False )
new_category = forms.CharField(max_length=100, required = False )
def __init__(self, *args, **kwargs):
super(SongEditForm, self).__init__( *args, **kwargs)
self.fields['author'].required = False
self.fields['category'].required = False
def clean(self):
#FIXME: check user validation
cleaned_data = self.cleaned_data
if not cleaned_data['author'] and not cleaned_data
['new_author']:
raise forms.ValidationError('Fill either author or new
author')
if not cleaned_data['author'] and cleaned_data['new_author']:
authors = songs_models.Author.objects.filter(name =
cleaned_data['new_author'])
if len(authors) > 0:
#TODO: select existing author
#self.data.author = authors[0] #doesn't work
#self.data.new_author = u'test' #doesn't work
raise forms.ValidationError('author with that name
already
exists, so choose him/her instead of creating new one')
else: #create author
#self.author = songs_models.Author()
#self.author.name = cleaned_data['new_author']
pass
return cleaned_data
--
Maciej Dziardziel
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