If AWS lambda doesn't offer any kind of stepwise debugging facility then you
would have to keep trying different things, differnet combinations of
configuration / imports, and whatever else you can think of that makes the
behavior occur or not occur, until you can isolate it to a single thing.
I don't know how AWS lambda works but if you're saying a three line SQLAlchemy
program like the one below fails:
>>> from sqlalchemy import table, select, column
>>> t = table('t', column('a'), column('b'))
>>> stmt = select([t]).where(t.c.a == 'hi')
>>> print(stmt)
SELECT t.a, t.b
FROM t
WHERE t.a = :a_1
that would mean SQLAlchemy itself is setting itself up in some way that is not
compatible with AWS lambda.
On Fri, Feb 14, 2020, at 4:32 PM, Mark Wilkins wrote:
> This seems to be correct, the issue does not occur if I run the exact same
> code locally. Lambda must be doing something, somehow, that is causing this.
> Any advice on how to fix the problem?
>
>
> On Friday, February 14, 2020 at 9:10:49 AM UTC-5, Mike Bayer wrote:
>> this looks like something up with the environment or the interpreter. The
>> error message says it got an object whose type() returns "BinaryExpression".
>> that is exactly the type it is looking for; this class should be a subclass
>> of sqlalchemy.sql.visitors.Visitable. However for this error to occur, that
>> is suddenly not the case, or the Visitable / BinaryExpression symbol has
>> been modified at runtime, something like that. It's not clear if this could
>> be some artifact of AWS Lambda, or the way the application is doing imports,
>> or something like that.
>>
>> the approach here would be to make a test program that produces the error
>> under AWS Lambda, then run it in a local Python environment and see if the
>> results are the same or different.
>>
>> On Fri, Feb 14, 2020, at 5:16 AM, Simon King wrote:
>>> Can you show the real code that runs the query? I'm wondering whether
>>> the thing that you are comparing against my_table.c.name is not
>>> actually a simple string.
>>>
>>> Simon
>>>
>>> On Wed, Feb 12, 2020 at 11:01 PM Mark Wilkins <cont...@markwilkins.dev>
>>> wrote:
>>> >
>>> > Some additional code incase its relevent:
>>> >
>>> > # Get DB connection
>>> > engine = setup_env_db_engine(debug=True)
>>> > connection = engine.connect()
>>> >
>>> > # Configure SQLalchemy
>>> > meta = MetaData(bind=engine)
>>> > meta.reflect()
>>> >
>>> > my_table = meta.tables.get('my_table')
>>> >
>>> >
>>> > --
>>> > SQLAlchemy -
>>> > The Python SQL Toolkit and Object Relational Mapper
>>> >
>>> > http://www.sqlalchemy.org/
>>> >
>>> > To post example code, please provide an MCVE: Minimal, Complete, and
>>> > Verifiable Example. See http://stackoverflow.com/help/mcve for a full
>>> > description.
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>>>
>>> --
>>> SQLAlchemy -
>>> The Python SQL Toolkit and Object Relational Mapper
>>>
>>> http://www.sqlalchemy.org/
>>>
>>> To post example code, please provide an MCVE: Minimal, Complete, and
>>> Verifiable Example. See http://stackoverflow.com/help/mcve for a full
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>>>
>>
>
> --
> SQLAlchemy -
> The Python SQL Toolkit and Object Relational Mapper
>
> http://www.sqlalchemy.org/
>
> To post example code, please provide an MCVE: Minimal, Complete, and
> Verifiable Example. See http://stackoverflow.com/help/mcve for a full
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--
SQLAlchemy -
The Python SQL Toolkit and Object Relational Mapper
http://www.sqlalchemy.org/
To post example code, please provide an MCVE: Minimal, Complete, and Verifiable
Example. See http://stackoverflow.com/help/mcve for a full description.
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