- add geoalchemy2 for inserting geometry observation

- tested original InsertObservation request - see ImportMobileObservation_example.xml

db/models.py

@@ -13,6 +13,8 @@ from sqlalchemy import (Column, Integer, Sequence,
                         String, DateTime, ForeignKey, Numeric, SmallInteger, create_engine)
 from sqlalchemy.ext.declarative import declarative_base
 from sqlalchemy.orm import session, relationship, sessionmaker
+# from geoalchemy2 import Geometry
+from geoalchemy2.types import Geometry
 #from marshmallow import Schema
 from marshmallow_sqlalchemy import SQLAlchemySchema, SQLAlchemyAutoSchema
 from marshmallow import fields
@@ -26,7 +28,7 @@ Base = declarative_base()
 def create_pg_session() -> sessionmaker:
     """ create postgres db session """
     load_dotenv(find_dotenv())
-    dbschema = ''
+    dbschema = 'gba'
     db_user = os.environ.get("POSTGIS_DBUSER")
     db_password = os.environ.get("POSTGIS_DBPASSWORD")
     db_url = os.environ.get("POSTGIS_DBURL")
@@ -186,8 +188,9 @@ class Observation(Base):
     result_time = Column('result_time', DateTime)
     sta_identifier = Column('sta_identifier', String)
     value_identifier = Column('value_identifier', String)
-    value_quantity = Column('value_quantity', Numeric(20, 10))
-    value_text = Column('value_text', String)
+    value_quantity = Column('value_quantity', Numeric(20, 10), nullable=True)
+    value_text = Column('value_text', String, nullable=True)
+    value_geometry = Column(Geometry(geometry_type='POLYGON', srid=4326, dimension=3), nullable=True)
 
     fk_dataset_id = Column(Integer, ForeignKey(
         'gba.dataset.dataset_id'), nullable=False)
@@ -263,7 +266,7 @@ def create_db():
         isolation_level="READ UNCOMMITTED", echo=True)
     # session_maker = sessionmaker(bind=engine)
     # session = session_maker()
-    Base.metadata.drop_all(bind=engine)
+    # Base.metadata.drop_all(bind=engine)
     # Base.metadata.create_all(engine)