The precedence for EXISTS is lower than that of neg in
sql/operators.py so it will always render the parenthesis unless those
precedences are changed. otherwise you can use op() or whatever,
~op("EXISTS")("foo")
from sqlalchemy import select, column, Boolean
from sqlalchemy.sql.expression import UnaryExpression
from sqlalchemy.sql import operators
unary = UnaryExpression(select([column('q')]),
operator=operators.custom_op("EXISTS", precedence=10),
type_=Boolean)
print(~unary)
On Wed, Mar 20, 2019 at 12:12 PM Jonathan Vanasco <jvana...@gmail.com> wrote:
>
> Is it possible to easily render "NOT EXISTS( " with a current API command?
>
> Both `~exists(` and `not_(exists(` will render "NOT ( EXISTS( ". I need to
> remove the superfluous parenthesis (this has to do with unit tests and
> ensuring parity of SQL across a handful of apps and custom commands).
>
> I could do this with a custom function or compiler, but I feel like I must be
> missing something in the docs.
>
> --
> SQLAlchemy -
> The Python SQL Toolkit and Object Relational Mapper
>
> http://www.sqlalchemy.org/
>
> To post example code, please provide an MCVE: Minimal, Complete, and
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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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