Re: Foreign Key Chicken/Egg Inline Fu

Unless a player can play for multiple teams (which I'm doubting since
Team is a ForeignKey for a Player), why not remove that 'captain'
attribute from your Team and put it into your Player model as a
boolean field? You could create a ModelManager or class-level model
method to grab the associated team caption if you want to access it
easily. Otherwise, it's just a matter of:

Team.objects.get('team_name').player_set.filter(captain=True) # Or
something along those lines...

Just an idea anyways :) Good luck!

On Wed, May 30, 2012 at 2:15 PM, Patrick Gavin <wezelboy@gmail.com> wrote:
> Hi-
>
> I'm new to Django, but so far I think it is the bee's knees.
>
> I could use some insight into a problem I'm working on.
>
> Given the following...
>
> ---------------------------------
> # models.py
>
> from django.db import models
>
> class Team(models.Model):
>    name = models.CharField(max_length=30)
>
>    # captain is a player- but there can only be one captain per team.
>    # null and blank are true to allow the team to be saved despite
> not having a captain
>    captain = models.ForeignKey('Player', related_name='team_captain',
> null=True, blank=True)
>
>    def __unicode__(self):
>        return u'{0}'.format(self.name)
>
> class Player(models.Model):
>    first_name = models.CharField(max_length=20)
>    last_name = models.CharField(max_length=30)
>    team = models.ForeignKey('Team')
>
>    def __unicode__(self):
>        return u'{0} {1}'.format(self.first_name, self.last_name)
>
>
> # admin.py
>
> from league.models import *
> from django.contrib import admin
>
> class PlayerInline(admin.TabularInline):
>    model = Player
>    extra = 8
>
> class TeamAdmin(admin.ModelAdmin):
>    inlines = [PlayerInline]
>    list_display = ('name', 'captain')
>
> ---------------------------------
>
> As is, when I create a new team in the admin interface I can add the
> players inline, but I have to leave the team captain blank, save the
> team, and then go back and change the team and set the captain to one
> of the players added previously. This is kind of a drag though.
>
> Is there a way that I can make the team captain be automatically set
> to the first player entered inline when the team is saved the first
> time?
>
> I 've thought about adding a boolean field to the Player model called
> "is_captain", but I want to enforce only one captain per team. If I
> were to go this route, is there a way I could make the is_captain
> field default to True for the first inline entry but false for the
> rest?
>
> Thanks,
>
> -Patrick
>
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