Re: Foreign Key Chicken/Egg Inline Fu

Sorry, I completely mis-read the last part of your problem. You
already thought about the same solution, haha. You might be able to
modify the Player model's clean (or save) method to prohibit any Team
from having more than one team captain. However, I'd probably just
check it in the Form you're using (outside of Admin)

On Wed, May 30, 2012 at 4:02 PM, Kurtis Mullins
<kurtis.mullins@gmail.com> wrote:
> 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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