title: Django MongoDB Migration Warnings
body: <pre><code>  Applying contenttypes.0001_initial...This version of djongo does not support &quot;schema validation using CONSTRAINT&quot; fully. Visit https://www.patreon.com/nesdis
   OK
    Applying auth.0001_initial...This version of djongo does not support &quot;schema validation using KEY&quot; fully. Visit https://www.patreon.com/nesdis
  This version of djongo does not support &quot;schema validation using REFERENCES&quot; fully. Visit https://www.patreon.com/nesdis
   OK
    Applying admin.0001_initial... OK
    Applying admin.0002_logentry_remove_auto_add... OK
    Applying admin.0003_logentry_add_action_flag_choices... OK
    Applying contenttypes.0002_remove_content_type_name...This version of djongo does not support &quot;COLUMN DROP NOT NULL &quot; fully. Visit https://www.patreon.com/nesdis
  This version of djongo does not support &quot;DROP CASCADE&quot; fully. Visit https://www.patreon.com/nesdis
   OK
    Applying auth.0002_alter_permission_name_max_length... OK
    Applying auth.0003_alter_user_email_max_length... OK
    Applying auth.0004_alter_user_username_opts... OK
    Applying auth.0005_alter_user_last_login_null... OK
    Applying auth.0006_require_contenttypes_0002... OK
    Applying auth.0007_alter_validators_add_error_messages... OK
    Applying auth.0008_alter_user_username_max_length... OK
    Applying auth.0009_alter_user_last_name_max_length... OK
    Applying auth.0010_alter_group_name_max_length... OK
    Applying auth.0011_update_proxy_permissions... OK
    Applying sessions.0001_initial... OK
  </code></pre>
  <p><em>I'm trying to connect Django with MongoDB database.</em>
  <em><strong>Why am I getting these warnings while migrating?</strong></em></p>