old_contents: from flask_admin.contrib.sqla.typefmt import DEFAULT_FORMATTERS as BASE_FORMATTERS
  import json
  from jinja2 import Markup
  from wtforms.widgets import html_params
  from geoalchemy2.shape import to_shape
  from geoalchemy2.elements import WKBElement
  from sqlalchemy import func
  from flask import current_app
  
  
  def geom_formatter(view, value):
      params = html_params(**{
          "data-role": "leaflet",
          "disabled": "disabled",
          "data-width": 100,
          "data-height": 70,
          "data-geometry-type": to_shape(value).geom_type,
          "data-zoom": 15,
      })
      if value.srid is -1:
          geojson = current_app.extensions['sqlalchemy'].db.session.scalar(func.ST_AsGeoJson(value))
      else:
          geojson = current_app.extensions['sqlalchemy'].db.session.scalar(func.ST_AsGeoJson(value.ST_Transform( 4326)))
      return Markup('<textarea %s>%s</textarea>' % (params, geojson))
  
  
  DEFAULT_FORMATTERS = BASE_FORMATTERS.copy()
  DEFAULT_FORMATTERS[WKBElement] = geom_formatter
  
new_contents: from flask_admin.contrib.sqla.typefmt import DEFAULT_FORMATTERS as BASE_FORMATTERS
  from jinja2 import Markup
  from wtforms.widgets import html_params
  from geoalchemy2.shape import to_shape
  from geoalchemy2.elements import WKBElement
  from sqlalchemy import func
  
  
  def geom_formatter(view, value):
      params = html_params(**{
          "data-role": "leaflet",
          "disabled": "disabled",
          "data-width": 100,
          "data-height": 70,
          "data-geometry-type": to_shape(value).geom_type,
          "data-zoom": 15,
      })
      if value.srid is -1:
          value.srid = 4326
      geojson = view.model.query.with_entities(func.ST_AsGeoJSON(value)).scalar()
      return Markup('<textarea %s>%s</textarea>' % (params, geojson))
  
  
  DEFAULT_FORMATTERS = BASE_FORMATTERS.copy()
  DEFAULT_FORMATTERS[WKBElement] = geom_formatter
  
subject: Remove Flask-SQLAlchemy dependency It should be noted that the declarative base still has to be configured like this: