ModelForm in Generic Relations isn't display in the template

[carlos]

Hello, I have an unsolved mystery 

ok i have a generic model example

models.py

class ModelOne(models.Model):

     content_type = models.ForeignKey(ContentType)

    object_id = models.IntegerField(db_index=True)

    content_object = generic.GenericForeignKey()

    name = models.CharField(max_length=200)

    attach = models.FileField(upload_to=get_file_path, null=True, blank=True)

   

    def __unicode__(self):

        return self.name

I relate this model with another model as follows example

class ModelTwo(models.Model):

    name = models.CharField(max_length=200)

    attach1 = generic.GenericRelation(ModelOne)

ok i now in forms.py i create ModelForm

forms.py

class ModelTwoForm(ModelForm):

    class Meta:

        model = ModelTwo

but when I print the ModelTwoForm in the template do not show me my generic field attach1 why?

know how to solve this? i don't use the contrib.admin

thank you very much for any help