title: How to use ListField in django models.py while using DJONGO as engine in settings.py
body: <p>my json data seems like this</p>
  
  <pre><code>{
      "Batch Year": 1998 - 1999,
      "Roll Nos": ["36", "125"],
      "Student Names": ["xyz", "xxy"],
      "Project Name": "IMPLEMENTATIONOF NETWORK SECURITY BY VIRTUAL PRIVATE NETWORK (VPN)",
      "Project Supervisor": "abc",
      "External Supervisor": "aaa",
      "Co-Supervisor": "None",
      "Project Id": 155
  }
  </code></pre>
  
  <p>for this data i defined ListFields in models.py for Roll Nos and Student Names but when i was using admin panel to add data im my database i am facing error:</p>
  
  <blockquote>
    <p>"Exception Value: 
    A Formless Field cannot be modified from Django Admin."</p>
  </blockquote>
  
  <p>settings.py</p>
  
  <pre><code>DATABASES = {
      'default': {
          'ENGINE': 'djongo',
          'NAME': 'fypcis_db',
      }
  </code></pre>
  
  <p>models.py</p>
  
  <pre><code>from __future__ import unicode_literals
  from djongo import models
  import djongo
  
  class students(models.Model):
      batch_year = models.IntegerField(db_column='Batch Year')  # Field name made lowercase.
      roll_nos = djongo.models.ListField(db_column='Roll Nos',default=True)  # Field name made lowercase.
      student_name = djongo.models.ListField(db_column='Student Names',default=True)  # Field name made lowercase.
      project_name = models.CharField(max_length=250, db_column='Project Name',default=True)  # Field name made lowercase.
      project_supervisor = models.CharField(max_length=250, db_column='Project Supervisor',default=True)  # Field name made lowercase.
      external_supervisor = models.CharField(max_length=250,db_column='External Supervisor',default=True)  # Field name made lowercase.
      co_supervisor = models.CharField(max_length=250,db_column='Co-Supervisor',default=True)  # Field name made lowercase.
      project_id = models.IntegerField(db_column='Project Id')  # Field name made lowercase.
  </code></pre>
  
  <p>please help me to solve this error.
  Thanks in advance</p>
  
  <p>i am using django 2.2 and djongo as Engine</p>