Hello.
I'm using a connection pool backed by SQLAlchemy (1.2.1) to access a
Postgresql (9.6) server using the psycopg2 (2.7.3.2) driver. I have the
following pool configuration options set:
from sqlalchemy.dialects import postgresql
DATABASE_POOL_ARGS = {
'max_overflow': 0,
'pool_size': 3,
'recycle': 3600,
'timeout': 10,
'pre_ping': True,
'dialect': postgresql.dialect(),
}
Whenever an error occurs during the initial ping I get an exception:
'NoneType' object has no attribute 'Error'
on line 477 of file sqlalchemy/engine/default.py which is:
except self.dbapi.Error as err:
"self" in this case is an object of type
"sqlalchemy.dialects.postgresql.psycopg2.PGDialect_psycopg2". Instances of
this class do not seem to have the "dbapi" attribute, only the class itself
has it. Should I be passing the class and not an instance for the "dialect"
option? I've tried that and got a different kind of error:
File
"//anaconda/envs/opp/lib/python3.6/site-packages/sqlalchemy/pool.py", line
812, in _checkout
result = pool._dialect.do_ping(fairy.connection)
TypeError: do_ping() missing 1 required positional argument:
'dbapi_connection'
Any help would be appreciated, thanks.
André
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