Thanks Mike, wrapping the view declaration with ()::TEXT worked perfectly, but good to know I can do it from SQLA at load time if need be.
On Saturday 30 October 2021 at 02:17:49 UTC+1 Mike Bayer wrote: > oh also, if this is a view, much easier, just put the CAST to TEXT in your > CREATE VIEW statement. that way you will definitely get strings back and > nothing json related will kick in client side. > > > > On Fri, Oct 29, 2021, at 9:16 PM, Mike Bayer wrote: > > psycopg2 driver (if that's what you're using) jumps in to do the JSON so > if you dont want json you need to cast as a string, like > cast(table.c.json_col, String). > > if you are using a Table with autoload you'd want to override this type > using the technique detailed at > https://docs.sqlalchemy.org/en/14/core/reflection.html#overriding-reflected-columns > > . > > On Fri, Oct 29, 2021, at 7:52 PM, Stephan Hügel wrote: > > I’m querying a Postgres view which returns JSON (SELECT > json_build_object(…)) which I’ve declared as a view in my db: > > allinfra = Table("allinfra", db.metadata, autoload_with=db.engine) > res = db.session.query(allinfra).scalar() > > But this gives me a Python dict, when what I want is the JSON string > returned by the view - serializing it with json.dumps() on the Python side > defeats the point (getting Postgres to do the heavy lifting). Apologies if > this question has an obvious answer, but I’ve found it impossible to search > for. > > > -- > 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+...@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/sqlalchemy/5f84f3a9-aace-43ab-b7d7-1f1a143f1a53n%40googlegroups.com > > <https://groups.google.com/d/msgid/sqlalchemy/5f84f3a9-aace-43ab-b7d7-1f1a143f1a53n%40googlegroups.com?utm_medium=email&utm_source=footer> > . > > > > -- 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 view this discussion on the web visit https://groups.google.com/d/msgid/sqlalchemy/97d62485-ba5b-4b7b-9153-edb7e8e7bf2cn%40googlegroups.com.
