field name hiding workaround

Hello,

I have got a class Lexeme which I would like to define as follows:

class Lexeme(models.Model):

class Meta:
unique_together = ((u"entity", u"language"),)

language = models.ForeignKey(Language)

# ...

I would like to have different types of lexemes, each of which has
another field type as "entity". Like so:

class CommodityLexeme(Lexeme):

class Meta:
verbose_name_plural = "Commodities"

entity = models.ForeignKey(Commodity)

class CountryLexeme(Lexeme):

class Meta:
verbose_name_plural = "Countries"

entity = models.ForeignKey(Country)

I know this doesn't work, because field name hiding is not permitted.
(See https://docs.djangoproject.com/en/1.1/topics/db/models/#field-name-hiding-is-not-permitted).

But what would be the most elegant workaround? I suppose someone has
had a similar problem before.

Jaroslav

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