我如何使用“外键”浏览Django模板中的数据库表

Question

我正在尝试在django模板中访问数据库表，但是我不知道使用外键从表切换到另一个的正确语法。 请注意，我的视图包含一个模型，而我试图使用外键访问其他模型。

我尝试使用“。”从表切换到另一个，但这不起作用。

那么，如何从事故中访问“位置”，“市政府”，“政府”和“地区”表？ （在模板中）

在models.py中：

class Accidents(models.Model):
    id_acc = models.CharField(db_column='ID_Acc', primary_key=True, max_length=64)  # Field name made lowercase.
    id_loc = models.ForeignKey('Locations', db_column='ID_Loc')  # Field name made lowercase.
    date_acc = models.DateTimeField(db_column='Date_Acc')  # Field name made lowercase.


    simple_history = HistoricalRecords()

    def __unicode__(self):
        return '%s' % (self.id_acc)

    class Meta:
        db_table = 'accidents'


class District(models.Model):
    id_d = models.IntegerField(db_column='ID_D', primary_key=True)  # Field name made lowercase.
    id_gov = models.ForeignKey('Governorate', db_column='ID_Gov')  # Field name made lowercase.
    name_d = models.TextField(db_column='Name_D')  # Field name made lowercase.

    class Meta:
        db_table = 'district'

    def __str__(self):
        return self.name_d


class Governorate(models.Model):
    id_gov = models.IntegerField(db_column='ID_Gov', primary_key=True)  # Field name made lowercase.
    name_gov = models.TextField(db_column='Name_Gov')  # Field name made lowercase.

    class Meta:
        db_table = 'governorate'

    def __str__(self):
        return self.name_gov


class Locations(models.Model):
    id_loc = models.AutoField(db_column='ID_Loc', primary_key=True)  # Field name made lowercase.
    id_mun = models.ForeignKey('Municipality', db_column='ID_Mun' ,default='null')  # Field name made lowercase.
    lat_loc = models.FloatField(db_column='Lat_Loc')  # Field name made lowercase.
    lon_loc = models.FloatField(db_column='Lon_Loc')  # Field name made lowercase.
    name_loc = models.TextField(db_column='Name_Loc')  # Field name made lowercase.

    class Meta:
        db_table = 'locations'

    def __str__(self):
        return self.name_loc

    def __unicode__(self):
        return '%s' % (self.name_loc)


class Municipality(models.Model):
    id_m = models.IntegerField(db_column='ID_M', primary_key=True)  # Field name made lowercase.
    id_d = models.ForeignKey(District, db_column='ID_D', blank=True, null=True)  # Field name made lowercase.
    name_m = models.CharField(db_column='Name_M', max_length=75, blank=True, null=True)  # Field name made lowercase.

    objects = models.GeoManager()

    class Meta:
        db_table = 'municipality'


    #def __str__(self):
    #    return self.id_m

    def __unicode__(self):
        return '%s' % (self.name_m)

在views.py中：

class MuniAccidentListView(ListView):
    model= Accidents
    context_object_name = 'accidents'    
    template_name = '...../plot_muni.html'

在模板中：

var stri = "{% for event in accidents %}{{event.date_acc}} {{event.id_loc.lat_loc}} {{event.id_loc.lon_loc}} {% endfor %}";

var strin = "{% for event in accidents %}{{event.date_acc}}  {{event.id_loc.name_loc}}  {% endfor %}";

var dis = "{% for event in accidents %}{{event.id_loc.id_mun.id_d.name_d}} {% endfor %}";