[Feature Request] Update to be compatible with pymongo >= 4.0.0

[fcaira]

[Feature Request] Update to be compatible with pymongo >= 4.0.0

pymongo 4.0.0 brought a lot of changes, see https://pymongo.readthedocs.io/en/stable/changelog.html#changes-in-version-4-0

The latest flask-admin code (at time of writing) still uses deprecated functions, such as remove(), insert() and count().

Examples:

• remove: https://github.com/flask-admin/flask-admin/blob/3f9bda85b3a6040ee0327474fbf5e3515467b58a/flask_admin/contrib/pymongo/view.py#L365
• insert: https://github.com/flask-admin/flask-admin/blob/3f9bda85b3a6040ee0327474fbf5e3515467b58a/flask_admin/contrib/pymongo/view.py#L315
• count: https://github.com/flask-admin/flask-admin/blob/3f9bda85b3a6040ee0327474fbf5e3515467b58a/flask_admin/contrib/pymongo/view.py#L254

This means the latest flask-admin is incompatible with the latest pymongo.

[shrimpchip28]

When is this going to be pushed to reflect what's pulled by pip? I see the code change for instance related to count in this repo, but not pulled by pip v1.6.0

[ElLorans]

Superseded since we are working to bring mongo support through mongoengine in #2611