To get a specific state using the primary key ID of the state, we can add a URL variable that will check for an integer ID. It is returned with the geometry as a geojson:

@app.route('/nba/api/v0.1/state/<int:state_id>', methods=['GET'])
def get_state(state_id):
  state = session.query(State).get(state_id)
  geojson = shapely.geometry.geo.mapping(to_shape(state.geom))
  data = [{"type": "Feature",  "properties":{"name":state.name}, 
  "geometry":{"type":"MultiPolygon",  "coordinates":[geojson["coordinates"]]},
  }]
  return jsonify({"type": "FeatureCollection","features":data})