Hello.
I want to let users to choose their countries. I have 2 models = *Countries*
with some figures and *CountriesTranslations*. I am trying to make tuple
with *country* (because user has FK to this model) and its *translation*.
In front-end I see dropdown list of countries, but when I try to save the
form, I see error: *Exception Value: Cannot assign "'AF'":
"UserProfile.country" must be a "Countries" instance.* Error happens at the
line *if user_profile_form.is_valid():*
# admindivisions.models
class Countries(models.Model):
osm_id = models.IntegerField(db_index=True, null=True)
status = models.IntegerField()
population = models.IntegerField(null=True)
iso3166_1 = models.CharField(max_length=2, blank=True)
iso3166_1_a2 = models.CharField(max_length=2, blank=True)
iso3166_1_a3 = models.CharField(max_length=3, blank=True)
class Meta:
db_table = 'admindivisions_countries'
verbose_name = 'Country'
verbose_name_plural = 'Countries'
class CountriesTranslations(models.Model):
common_name = models.CharField(max_length=81, blank=True, db_index=True)
formal_name = models.CharField(max_length=100, blank=True)
country = models.ForeignKey(Countries, on_delete=models.CASCADE,
verbose_name='Details of Country')
lang_group = models.ForeignKey(LanguagesGroups, on_delete=models.CASCADE
, verbose_name='Language of Country',
null=True)
class Meta:
db_table = 'admindivisions_countries_translations'
verbose_name = 'Country Translation'
verbose_name_plural = 'Countries Translations'
# profiles.forms
class UserProfileForm(forms.ModelForm):
# PREPARE CHOICES
country_choices = ()
lang_group = Languages.objects.get(iso_code='en').group
for country in Countries.objects.filter(status=1):
eng_name = country.countriestranslations_set.filter(lang_group=
lang_group).first()
if eng_name:
country_choices += ((country, eng_name.common_name),)
country_choices = sorted(country_choices, key=lambda tup: tup[1])
country = forms.ChoiceField(choices=country_choices, required=False)
class Meta:
model = UserProfile()
fields = ('email', 'email_privacy',
'profile_url',
'first_name', 'last_name',
'country',)
# profiles.views
def profile_settings(request):
if request.method == 'POST':
user_profile_form = UserProfileForm(request.POST, instance=request.
user)
if user_profile_form.is_valid():
user_profile_form.save()
messages.success(request, _('Your profile was successfully
updated!'))
return redirect('settings')
else:
messages.error(request, _('Please correct the error below.'))
else:
user_profile_form = UserProfileForm(instance=request.user)
return render(request, 'profiles/profiles_settings.html', {
'user_profile_form': user_profile_form,
})
As I understand, *country* from *((country, eng_name.common_name),)* is
converted to *str*. What is the right way to keep country instance in the
form? or if I am doing it in the wrong way, what way is correct?
As a possible solution is to use *ModelChoiceField* with overriding
*label_from_instance* as shown below:
class CountriesChoiceField(forms.ModelChoiceField):
def __init__(self, user_lang='en', *args, **kwargs):
super(CountriesChoiceField, self).__init__(*args, **kwargs)
self.user_lang = user_lang
def label_from_instance(self, obj):
return obj.countriestranslations_set.get(lang_group=self.user_lang)
class UserProfileForm(forms.ModelForm):
user_lang = user_lang_here
country = CountriesChoiceField(
queryset=Countries.objects.filter(
status=1, iso3166_1__isnull=False,
countriestranslations__lang_group=user_lang).order_by(
'countriestranslations__common_name'),
widget=forms.Select(), user_lang=user_lang)
class Meta:
model = UserProfile()
fields = ('email', 'email_privacy',
'profile_url',
'first_name', 'last_name',
'country',)
but in this case there are too much queries because of the
*label_from_instance* and page loads too slowly.
Would appreciate any advice how to solve this task.
Thanks.
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