> I don't understand. It's the same wheel added four times, not four
> different wheels.
I guess you could implement it either way. The thing is that doing it
this way would become complicated at the time you need to define what
is attached where. For Lego pieces, I'd do this:
class LegoType(Model) has a description, maybe a picture, and it's behavior
model LegoPiece has a ForeignKey(LegoType), a ManyToMany to other
LegoPieces (the ones it's connected to).
You'd have one LegoType = wheel, and four LegoPiece who's type would
be wheel. When you defined the Type you'd need a way to link each
model to specific python code that controlled how many pieces it can
connect to, and how, but that's a song for another day.
Then you do LegoPiece.objects.filter(type__name="wheel").count(), and
voila, you have how many wheels you have.
You COULD have enough knowing the amount of pieces of each kind you
have, you'd be modeling something similar to an inventory, but
defining connections in that context would be unnecessarily
complicated, since you'd not only have to count how many pieces you
have of each type, but when you connect one to another, *which one*
are you connecting? one that's free, or one that's connected to
another one? How would you model the connections? Say one brick can
connect to as many as 8 other pieces, 4 on each side, say you have 3
bricks, so you know you can't have more than 24 connecctions, but..
how do you differentiate between A--B C--D--E and A--B--C--D or.. I
don't know how to draw it, but D--A--B D--A--C (A is connected to D on
one side, and to B and C both on the other).
It might be that you can model your needs this way, but AFAICS, it'd
be a lot harder to follow things and keep things consistent in an
Object Oriented way.
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