Choices with many to many

Hi to all

thi is my first post on django group.

I'm new on django and I'm going crazy for a week on this question:

 

I have these models:

 

class Linea(models.Model):
    linea = models.CharField(unique=True, max_length=10, verbose_name = "Linea")
    class Meta:
          verbose_name_plural = "Linee"
    def __unicode__(self):
           return self.linea

 

class Board(models.Model):
    board = models.CharField(unique=True, max_length=15, verbose_name = "Board")
    life = models.IntegerField(max_length=4, verbose_name = "Ore di vita")
    class Meta:
         verbose_name_plural = "Boards"
    def __unicode__(self):
         return u'%s' % self.board

 

class Package(models.Model):
     package = models.CharField(unique=True, max_length=10, verbose_name = "Package")
     class Meta:
          verbose_name_plural = "Packages"
     def __unicode__(self):
          return self.package

 

class Prodotto(models.Model):
     linea = models.ForeignKey(Linea, verbose_name = "Linea")
     prodotto = models.CharField(unique=True, max_length=15, verbose_name = "Prodotto")
     package = models.ManyToManyField(Package, related_name="packages", verbose_name = "Package")
     board = models.ManyToManyField(Board, related_name="boards", verbose_name = "Board")

 

class Prove(models.Model):
     nomeprova = models.CharField(unique=True, max_length=20, verbose_name = "Nome prova")# *
     TIPOPROVA = (
                                           ('c1', c1',),(c2', c2.',),(c3.', c3.',),
                                 )
     tipodiprova = models.CharField(unique=True, max_length=10, choices = TIPOPROVA, default = 'c1', verbose_name = "Tipo di prova")
     linea = models.ForeignKey(Linea, verbose_name = "Linea")
     prodotto = models.ForeignKey(Prodotto, verbose_name = "Prodotto")
     package = models.CharField(max_length=20, verbose_name = "Package")# *
     board = models.CharField(max_length=20, verbose_name = "Board")# *

 

In admin form of  "Prove" for the the fields package and board  I need to choice from the list of boards and packages that belong prodotto, because prodotto (as you can see ) contain a list of pakage and boards (Many to many ).

For do that the only thing I do until now is to override rthe Prove.board and Prove.package fields to forms.ChoiceField but how can I take the list from the current product and put it in these fields?

 

Tanks in advance

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