[sqlalchemy] Problem with inserting row containing a value with type PATH of postgres with geoalchemy2

[Christos Ch]

I have a postgres table below with a field `coordinates` of type path:

 
   CREATE TABLE geometry
        (
            id serial not null primary key,
            coordinates path not null
        )




Trying to add a Geometry into the table:

    session.add(Geometry(id = 1, coordinates = "path('(15.234428926980286, 
47.95865145177352)')"))

 I am getting this error:

 sqlalchemy.exc.ProgrammingError: (psycopg2.errors.UndefinedFunction) 
function st_geomfromewkt(unknown) does not exist

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