title: what field type to use for model field in form in django?
body: <p>I need to make a model field read only in my form.  I do this with the following:</p>
  
  <pre><code>class ActivityEntryForm(forms.ModelForm):
      activity = forms.CharField(widget=forms.TextInput(attrs={'readonly':'readonly'}))
      duration = forms.IntegerField()
  
      class Meta:
          model = CustomerActivity
          fields = ('activity', 'duration',)
  </code></pre>
  
  <p>Activity is an actual model foreign key field to the CustomerActivity model.</p>
  
  <p>This currently displays the Activity Id number.  I want it to print the name of the activity.</p>
  
  <p>What field type do I use or how can I show the name instead of the id?</p>