new_contents: #!/usr/bin/env python
  # -*- coding: utf-8 -*-
  from django import forms
  from django.utils.functional import lazy
  
  from .models import Field
  from opps.core.forms import model_choices
  
  
  class FieldAdminForm(forms.ModelForm):
      application = forms.ChoiceField(choices=lazy(model_choices, tuple)())
  
      class Meta:
          model = Field
  
subject: create field admin form, add application choice lazy model_choices