'Implements the GET method for comments against response ID'

def retrieve(self, request, comment_id=None):

    form = CommentGetForm(request.GET)
    if (not form.is_valid()):
        raise ValidationError(form.errors)
    return get_response_comments(request, comment_id, form.cleaned_data['page'], form.cleaned_data['page_size'], form.cleaned_data['requested_fields'])
