Make import backward compatible (Django<1.7)
from django import forms
from django.forms.models import ModelForm
try:
    from django.forms.utils import ErrorList
except ImportError:
    # Django<1.7 (deprecated in Django 1.8, removed in 1.9)
    from django.forms.util import ErrorList
from django.utils.translation import ugettext_lazy as _

from cms.models import Page

from .models import InheritPagePlaceholder


class InheritForm(ModelForm):
    from_page = forms.ModelChoiceField(
        label=_("page"), queryset=Page.objects.drafts(), required=False)
    
    class Meta:
        model = InheritPagePlaceholder
        exclude = ('page', 'position', 'placeholder', 'language',
                   'plugin_type')
    
    def for_site(self, site):    
        # override the page_link fields queryset to containt just pages for
        # current site
        self.fields['from_page'].queryset = Page.objects.drafts().on_site(site)
        
    def clean(self):
        cleaned_data = super(InheritForm, self).clean()
        if not cleaned_data['from_page'] and not cleaned_data['from_language']:
            self._errors['from_page'] = ErrorList(
                [_("Language or Page must be filled out")])

        return cleaned_data

from django import forms
from django.forms.models import ModelForm
from django.forms.utils import ErrorList
from django.utils.translation import ugettext_lazy as _

from cms.models import Page

from .models import InheritPagePlaceholder


class InheritForm(ModelForm):
    from_page = forms.ModelChoiceField(
        label=_("page"), queryset=Page.objects.drafts(), required=False)
    
    class Meta:
        model = InheritPagePlaceholder
        exclude = ('page', 'position', 'placeholder', 'language',
                   'plugin_type')
    
    def for_site(self, site):    
        # override the page_link fields queryset to containt just pages for
        # current site
        self.fields['from_page'].queryset = Page.objects.drafts().on_site(site)
        
    def clean(self):
        cleaned_data = super(InheritForm, self).clean()
        if not cleaned_data['from_page'] and not cleaned_data['from_language']:
            self._errors['from_page'] = ErrorList(
                [_("Language or Page must be filled out")])

        return cleaned_data
