Re: [sqlalchemy] check for None with == , within join, raises argument error
On Monday, February 5, 2018 at 3:19:40 AM UTC-5, Rajesh Rolo wrote: > > > Thank you. .op() seems to have done the trick. I'm going to go with it as > of now. > >> Please make a test-case of your mistake though, it's important to get this figured out and patched if there is a bug. -- 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. --- You received this message because you are subscribed to the Google Groups "sqlalchemy" group. To unsubscribe from this group and stop receiving emails from it, send an email to sqlalchemy+unsubscr...@googlegroups.com. To post to this group, send email to sqlalchemy@googlegroups.com. Visit this group at https://groups.google.com/group/sqlalchemy. For more options, visit https://groups.google.com/d/optout.
Re: [sqlalchemy] check for None with == , within join, raises argument error
On Feb 4, 2018 4:25 PM, "Jonathan Vanasco" wrote:
On Sunday, February 4, 2018 at 11:07:49 AM UTC-5, Mike Bayer wrote:
>
> You test for NULL with == None. I have no idea what your issue is can you
> please share complete mappings, complete stack trace and a reproducible
> example? Thanks
>
This definitely needs a reproduction testcase to find the correct error as
Mike noted, but if you're stuck in a bind for a temporary fix you can try:
User.flag.op('IS')(None)
using `.op()` has gotten me out of a lot of problems.
Any examples? Was hoping to get a bug report out of this.
you should also check the sql emitted, because you may need to
'.self_group()' the or_ elements.
or_(User.flag == None, User.flag != "dnd").self_group()
i haven't been able to create a reliable test case for the above, but there
are a handful of times in postgres queries where my or's haven't been
grouped as expected, leading to a bad query. i check everything now.
> --
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.
---
You received this message because you are subscribed to the Google Groups
"sqlalchemy" group.
To unsubscribe from this group and stop receiving emails from it, send an
email to sqlalchemy+unsubscr...@googlegroups.com.
To post to this group, send email to sqlalchemy@googlegroups.com.
Visit this group at https://groups.google.com/group/sqlalchemy.
For more options, visit https://groups.google.com/d/optout.
--
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.
---
You received this message because you are subscribed to the Google Groups
"sqlalchemy" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to sqlalchemy+unsubscr...@googlegroups.com.
To post to this group, send email to sqlalchemy@googlegroups.com.
Visit this group at https://groups.google.com/group/sqlalchemy.
For more options, visit https://groups.google.com/d/optout.
Re: [sqlalchemy] check for None with == , within join, raises argument error
Jonathan,
Thank you. .op() seems to have done the trick. I'm going to go with it as
of now.
Thanx,
Rajesh
On Monday, February 5, 2018 at 2:55:50 AM UTC+5:30, Jonathan Vanasco wrote:
>
>
>
> On Sunday, February 4, 2018 at 11:07:49 AM UTC-5, Mike Bayer wrote:
>>
>> You test for NULL with == None. I have no idea what your issue is can
>> you please share complete mappings, complete stack trace and a reproducible
>> example? Thanks
>>
>
> This definitely needs a reproduction testcase to find the correct error as
> Mike noted, but if you're stuck in a bind for a temporary fix you can try:
>
>User.flag.op('IS')(None)
>
>
> using `.op()` has gotten me out of a lot of problems.
>
> you should also check the sql emitted, because you may need to
> '.self_group()' the or_ elements.
>
> or_(User.flag == None, User.flag != "dnd").self_group()
>
>
> i haven't been able to create a reliable test case for the above, but
> there are a handful of times in postgres queries where my or's haven't been
> grouped as expected, leading to a bad query. i check everything now.
>
>>
--
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.
---
You received this message because you are subscribed to the Google Groups
"sqlalchemy" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to sqlalchemy+unsubscr...@googlegroups.com.
To post to this group, send email to sqlalchemy@googlegroups.com.
Visit this group at https://groups.google.com/group/sqlalchemy.
For more options, visit https://groups.google.com/d/optout.
Re: [sqlalchemy] check for None with == , within join, raises argument error
On Sunday, February 4, 2018 at 11:07:49 AM UTC-5, Mike Bayer wrote:
>
> You test for NULL with == None. I have no idea what your issue is can you
> please share complete mappings, complete stack trace and a reproducible
> example? Thanks
>
This definitely needs a reproduction testcase to find the correct error as
Mike noted, but if you're stuck in a bind for a temporary fix you can try:
User.flag.op('IS')(None)
using `.op()` has gotten me out of a lot of problems.
you should also check the sql emitted, because you may need to
'.self_group()' the or_ elements.
or_(User.flag == None, User.flag != "dnd").self_group()
i haven't been able to create a reliable test case for the above, but there
are a handful of times in postgres queries where my or's haven't been
grouped as expected, leading to a bad query. i check everything now.
>
--
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.
---
You received this message because you are subscribed to the Google Groups
"sqlalchemy" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to sqlalchemy+unsubscr...@googlegroups.com.
To post to this group, send email to sqlalchemy@googlegroups.com.
Visit this group at https://groups.google.com/group/sqlalchemy.
For more options, visit https://groups.google.com/d/optout.
Re: [sqlalchemy] check for None with == , within join, raises argument error
You test for NULL with == None. I have no idea what your issue is can you
please share complete mappings, complete stack trace and a reproducible
example? Thanks
On Feb 4, 2018 9:53 AM, "Rajesh Rolo" wrote:
I have a query which tries to get list of users for a particular set of
events which joins with the user table to check if the user is not marked
for a particular flag "dnd" (flag column could have a null value too). The
query goes something like this:
query = session.query(Event.uid).filter(Event.event.in_(event_list)).\
join(User, and_((User.id == Event.uid), \
or_(User.flag == None, User.flag != "dnd")))
It raises an Argument error exception
ArgumentError("Only '=', '!=', 'is_()', 'isnot()' operators can
be used with None/True/False",)
I've tried other possibilities/suggestions (listed below) but still get the
same error:
- using # noqa
- checking "User.Flag is None"
- checking "User.Flag.is_(None)"
In other places, when I'm checking only with the User table without a join,
it seems to work. For eg:
User.query.filter(User.flag == None, User.flag != "dnd").all()
works.
DB being used is postgresql.
How do I check for NULL value within this join?
--
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.
---
You received this message because you are subscribed to the Google Groups
"sqlalchemy" group.
To unsubscribe from this group and stop receiving emails from it, send an
email to sqlalchemy+unsubscr...@googlegroups.com.
To post to this group, send email to sqlalchemy@googlegroups.com.
Visit this group at https://groups.google.com/group/sqlalchemy.
For more options, visit https://groups.google.com/d/optout.
--
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.
---
You received this message because you are subscribed to the Google Groups
"sqlalchemy" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to sqlalchemy+unsubscr...@googlegroups.com.
To post to this group, send email to sqlalchemy@googlegroups.com.
Visit this group at https://groups.google.com/group/sqlalchemy.
For more options, visit https://groups.google.com/d/optout.
[sqlalchemy] check for None with == , within join, raises argument error
I have a query which tries to get list of users for a particular set of
events which joins with the user table to check if the user is not marked
for a particular flag "dnd" (flag column could have a null value too). The
query goes something like this:
query = session.query(Event.uid).filter(Event.event.in_(event_list)).\
join(User, and_((User.id == Event.uid), \
or_(User.flag == None, User.flag != "dnd")))
It raises an Argument error exception
ArgumentError("Only '=', '!=', 'is_()', 'isnot()' operators can
be used with None/True/False",)
I've tried other possibilities/suggestions (listed below) but still get the
same error:
- using # noqa
- checking "User.Flag is None"
- checking "User.Flag.is_(None)"
In other places, when I'm checking only with the User table without a join,
it seems to work. For eg:
User.query.filter(User.flag == None, User.flag != "dnd").all()
works.
DB being used is postgresql.
How do I check for NULL value within this join?
--
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.
---
You received this message because you are subscribed to the Google Groups
"sqlalchemy" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to sqlalchemy+unsubscr...@googlegroups.com.
To post to this group, send email to sqlalchemy@googlegroups.com.
Visit this group at https://groups.google.com/group/sqlalchemy.
For more options, visit https://groups.google.com/d/optout.
