def backwards(self, orm):

        # Renaming column for 'Comment.parent_content' to match new field type.
        db.rename_column('canvas_comment', 'parent_content_id', 'parent_content')
        # Changing field 'Comment.parent_content'
        db.alter_column('canvas_comment', 'parent_content', self.gf('django.db.models.fields.CharField')(max_length=32))

        # Renaming column for 'Comment.reply_content' to match new field type.
        db.rename_column('canvas_comment', 'reply_content_id', 'reply_content')
        # Changing field 'Comment.reply_content'
        db.alter_column('canvas_comment', 'reply_content', self.gf('django.db.models.fields.CharField')(max_length=32))