django admin filter foregein key

[Mariano DAngelo]

What I'm trying to do is to filter a dropdown list with foregein key, with the value of a previus selected dropdown list:

cat_choices = (('AMA','Amateur Mayores'),('AJ','Amateur Juveniles'),('AME','Amateur Menores'),('P','Profesional'))    

class category(models.Model):

    name = models.CharField('Categoria', max_length=30)

    gender = models.CharField('Sexo',choices= (('M','Masculino'),('F','Femenino')), max_length=1)

    type = models.CharField('Tipo',choices=cat_choices , max_length=3)

    

class boxer (person):

    gender = models.CharField('Sexo',choices= (('m','Masculino'),('F','Femenino')), max_length=30)

    type = models.CharField('Tipo',choices=cat_choices, max_length=30)

    category = models.ForeignKey(category)

  

    

I need to filter categories in boxer admin with the value of gender, and type choose in boxer admin.... I was going to do it with js but I wanted to know if the something already done...

thanks