class table1(models.Model):
    field1 = models.IntegerField()
    field3 = models.ManyToManyField(table2)
class table2(models.Model):
    some_field = models.IntegerField()
class table1_table2(models.Model):
    table1 = models.ForeignKey(table1)
    table2 = models.ForeignKey(tv_channels)
    ex_field = models.CharField()

select = models.table1_table2.objects.get(table1=some_id)
    for item in select:
        some_var =  item.ex_field

'table1_table2' object has no attribute 'ex_field'

print dir(item)
print type(item) 

select = models.table1.objects.all()

{% for item in select %}
    <ul>
    {{ item.title }}
    {% for item2 in item.?????.all %}
        <li>{{ item2.title }} ({{ item2.ex_field??? }})</li>
    {% endfor %}
    </ul>
{% endfor %}