title: A foreign key field is not rendered inside an inline model admin in django
body: <p>I'm creating a small site to register sporting event results. I have two following models:</p>
  
  <ul>
  <li>Team</li>
  <li>Player (of a team)</li>
  <li>Match</li>
  <li>Goals (scored by a Player on a Match)</li>
  </ul>
  
  <p>in more detail:</p>
  
  <pre><code>class Team(models.Model):
      name = models.CharField(max_length=255)
  
  class Player(models.Model):
      team = models.ForeignKey(Team)
      name = models.CharField(max_length=255)
      total_goals = models.IntegerField(default=0)
  
      def __unicode__(self):
          return u"%s (%s)" % (self.name, self.team)
  
  
  class Match(TimeStampedModel):
      competition = models.ForeignKey(Competition)
      league = models.ForeignKey(League, null=True, blank=True)  # null==True, ha osztalyozo
  
      home = models.ForeignKey(Team, related_name="merkozes_home")
      away = models.ForeignKey(Team, related_name="merkozes_away")
      home_score = models.SmallIntegerField(blank=True, null=True)
      away_score = models.SmallIntegerField(blank=True, null=True)
      goal_list = models.ManyToManyField(Player, through='Goal')
  
      @property
      def winner(self):
          return self.home if self.home_score &gt; self.away_score else self.away
  
      @property
      def loser(self):
          return self.home if self.home_score &lt; self.away_score else self.away
  
      class Meta:
          unique_together = (('league', 'home', 'away'),)
  
      def __unicode__(self):
          return u"%s - %s (%s)" % (self.home, self.away, self.competition)
  
  
  class Goal(TimeStampedModel):
      player = models.ForeignKey(Player)
      ,atch = models.ForeignKey(Match)
      goals = models.SmallIntegerField(default=0)
      self_goal = models.BooleanField(default=False, blank=True)
  </code></pre>
  
  <p>I would like to edit goals together with match details under the django admin. Thus I've created the following admin models:</p>
  
  <pre><code>class GoalsInline(admin.TabularInline):
      model = Goal
      extra = 1
  
  @admin.register(Match)
  class MerkozesAdmin(admin.ModelAdmin):
      inlines = [GoalsInline]
  </code></pre>
  
  <p>Strangely, my admin inline does not show the <code>player</code> fields, just the other fields from the <code>Goal</code> model. I checked the html code too, and it's not even a hidden field.</p>
  
  <p>Do you have any idea what might be the reason for this and how can I get all the fields be shown?</p>