Many-to-one field in search

I am trying to make an EmailField variant which:

1: Is based on TEXT rather than VARCHAR, and

2: May be in a many-to-one relationship with entity.

I presently have:

class TextEmailField(models.EmailField):

    entity = models.ForeignKey(Entity)

    def __init__(self, *arguments, **keywords):

        models.EmailField.__init__(self, *arguments, **keywords)

    def get_internal_type(self):

        return u'TextField'

A search for emails for a given Entity id is:

    emails = directory.models.TextEmailField.objects.filter(entity__exact =

      id).all()

This is getting the error below. My best interpretation is that I'm attempting an operation on a field that is only defined for models. Is this correct? How should I be remedying it?

AttributeError at /profile/1

 type object 'TextEmailField' has no attribute 'objects'

Request Method:	GET
Request URL:	http://netbook:8000/profile/1
Django Version:	1.2.1
Exception Type:	AttributeError
Exception Value:	type object 'TextEmailField' has no attribute 'objects'
Exception Location:	/home/jonathan/directory/../directory/views.py in profile, line 37
Python Executable:	/usr/local/bin/python
Python Version:	2.6.5
Python Path:	['/home/jonathan/directory', '/usr/local/lib/python26.zip', '/usr/local/lib/python2.6', '/usr/local/lib/python2.6/plat-linux2', '/usr/local/lib/python2.6/lib-tk', '/usr/local/lib/python2.6/lib-old', '/usr/local/lib/python2.6/lib-dynload', '/usr/local/lib/python2.6/site-packages']
Server time:	Thu, 22 Jul 2010 16:26:04 -0500

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