python - Django - Multiple optional ForeignKey -

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class truc(models.model):   name = models.charfield(max_length=50, unique=true)   machin1 = models.foreignkey(machin1, blank=true, null=true)   machin2 = models.foreignkey(machin2, blank=true, null=true)   machin3 = models.foreignkey(machin3, blank=true, null=true)

i truc linked 1 machin, either machin1 either machin2 or machin3.

only 1 link, kind of validation:

machin1 xor machin2 xor machin3

if ever linked 1 use generic relation:

class truc(models.model):     name = models.charfield(max_length=50, unique=true)     content_type = models.foreignkey(contenttype)     object_id = models.positiveintegerfield()     machin_object = generic.genericforeignkey('content_type', 'object_id')

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