Re: ForeignKey problem

On 6-7-2012 15:17, Soviet wrote:

> Lets try LEGO pieces. I have a LEGO set that has many pieces (ManyToMany).
> But I have 4 wheels and 1 brick in that set. The 'brick' can be added with
> no problem, but how do I save the information that there's 4 'wheel'
> objects and not only one?

You don't. You get all wheel objects and count them. However, I think
the through argument is best explained with your original question, when
you asked:
"Say I want to add list of all Teams my Players played for."

This does not change the player model, nor the team model. What you're
asking for here, is a new model "player history", which is defines the
many-to-many:

class Team(models.Model) :
name = models.CharField(max_length=64)

class Player(models.Model) :
name = models.CharField(max_length=64)
playing_for = models.ForeignKey(Team, related_name='players')
history = models.ManyToManyField(Team, related_name='player_histories',
through='PlayerHistory') #quoted!

class PlayerHistory(models.Model) :
team = models.ForeignKey(Team)
player = models.ForeignKey(Player)
started = models.DateField()
ended = models.DateField()


--
Melvyn Sopacua


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