title: Django 2.0 queryset display "object (1)" not display value
body: <p>I want to display value from column <code>"sett_name"</code>, the value is (cisco and mikrotik). but what is displayed on html is <code>"c_Setting object (1) and c_Setting object (2)"</code>.</p>
  
  <p>I've tried same code on python 2.7 with django 1.8. It works but when I try on python 3 with django 2.1.7 it does not work (I already modified the code to python3)</p>
  
  <p>Here is <code>model.py</code> script :</p>
  
  <pre><code>class Ip(models.Model):
      ipaddr = models.CharField(max_length=255)
      vendor = models.CharField(max_length=255)
      def __str__ (self):
          return self.ipaddr
      def __str__(self):
          return 'ip address : %s: , vendor : %s' % (self.ipaddr, self.vendor)
  class c_Setting(models.Model):
      class Meta:
          db_table = 'autonet_setting'
      sett_name = models.CharField(max_length=255)
      def __unicode__(self):
          return self.sett_name
  </code></pre>
  
  <p>Here is <code>form.py</code> script :</p>
  
  <pre><code>from django import forms
  from .models import Connect, Ip, c_Setting as settings
  class IpForm(ModelForm):
      vendor = forms.ModelChoiceField(queryset=settings.objects.all().order_by('sett_name'))
      class Meta:
          model = Ip
          fields = ['ipaddr','vendor']
  class SettingForm(ModelForm):
      class Meta:
          model = settings
          fields = [
              'sett_name',
                          ...
                          ...
                  ]
  ...
  ...
  ...
  </code></pre>
  
  <p>here is the html file :</p>
  
  <pre><code>{{ ipform.management_form }} 
  {% for form in ipform %}
  ...
  ...
  form.vendor
  ...
  ...
  {% endfor %}
  </code></pre>
  
  <p>Here is the <code>view.py</code> script :</p>
  
  <pre><code>...
  ...
  ipform = IpFormset()
  return render(request, 'config/code_based.html', {'form': formm, 'logins': Connect.objects.all(), 'ipform': ipform, 'status': status })
  ...
  ...
  </code></pre>
  
  <p>like I said before it display <code>"c_Setting object (1) and c_Setting object (2)"</code> not <code>"mikrotik and cisco"</code>. Thanks in advance</p>