from django import forms
from mysite.blog.models import Post, Comment

class AddComment(forms.ModelForm):
    class Meta:
        model = Comment

class FindSimilar(forms.ModelForm):
    class Meta:
        model = Post

    def clean(self):
        for f in self.instance._meta.get_all_field_names():
            if f in self.cleaned_data:
                field = self.instance._meta.get_field_by_name(f)[0]
                if isinstance(field, self.instance.similar):
                    setattr(self.instance, f, self.cleaned_data[f])