Django通过外键过滤表单字段答案

【问题标题】：Django filter form field by Foreign KeyDjango通过外键过滤表单字段
【发布时间】：2014-09-21 12:28:37
【问题描述】：

我正在尝试过滤表单选择，以便用户只能从某些比赛中选择球员。我已将_init_ 函数更改为如下形式，但没有任何变化

forms.py

from django.forms import ModelForm
from matchdaycentremodel.models import FantasyTeam
from playerteamstats.models import Player

class FantasySeasonForm(ModelForm):
    class Meta:
        model = FantasyTeam

    def _init_(self,*args,**kwargs):
        super(FantasySeasonForm,self)._init_(**kwargs)
        self.fields['player1'].queryset = playerteamstats.models.Player.objects.filter(team__competition__pk=2)

相关模型是..

models.py（玩家团队统计数据）

class Competition(models.Model):
    COMP_ID = models.AutoField(primary_key=True)
    season = models.ForeignKey(Season) #Foreign Key
    competition_id = models.IntegerField()
    competition_name = models.CharField(max_length=200)
    competition_code = models.CharField(max_length=6)

    def __str__(self):
        return '%s (%s)' % (self.competition_name, self.season.season_id) #e.g. 'English Barclays Premier League (2014)'

class Team(models.Model):
    team_id = models.IntegerField(primary_key=True)
    competition = models.ForeignKey(Competition) #Foreign Key
    team_name = models.CharField(max_length=200)
    def __str__(self):
        return self.team_name

class Player(models.Model):
    player_id = models.IntegerField(primary_key=True)
    team = models.ForeignKey(Team) #Foreign Key
    player_name = models.CharField(max_length=140)
    def __str__(self):
        return self.player_name

models.py (matchdaycentremodel)

class FantasyTeam(models.Model):
    FANTASY_TEAM_ID = models.AutoField(primary_key=True)
    player1 = models.ForeignKey(Player, related_name='player1')
    player2 = models.ForeignKey(Player, related_name='player2')
    player3 = models.ForeignKey(Player, related_name='player3')

views.py

@login_required
def entry(request):
    fantasyTeamForm = FantasySeasonForm() #Form to store each player in the fantasy team

    if request.method == 'POST':
        fantasyTeamForm = FantasySeasonForm(request.POST or None)   
        fantasyTeamForm.fields
        if fantasyTeamForm.is_valid():           
            fantasyTeamForm.save()            
            return HttpResponseRedirect('/season/entrysuccess') #page on success


    args = {}
    args.update(csrf(request))

    args['form'] = fantasyTeamForm

    return render_to_response('entry.html', args, context_instance=RequestContext(request))

如何过滤表单的 player1 使其只能从某个比赛中选择？

【问题讨论】：

标签： django django-forms django-views

【解决方案1】：

您的init 被定义为def _init_ 而它应该是def __init__（双下划线）

另外，正如 crodes 所提到的，您应该执行以下操作：

self.fields['player1'].queryset = Player.objects.filter(team__competition_id=2)

这没有引发异常的原因是，这些代码行从未执行过。

【讨论】：

【解决方案2】：

如果你的import语句是正确的，应该

self.fields['player1'].queryset = playerteamstats.models.Player.objects.filter(team__competition__pk=2)

不是

self.fields['player1'].queryset = Player.objects.filter(team__competition__pk=2)

【讨论】：

仍然没有区别，只是显示所有玩家：'(