I think what's important here is to come up with the exact SQL string you'd
like to create first, then if you can share that here we can show you how
SQLAlchemy can render it from the expression language. As far as working
with the PG functions someone else here might know or you can try stackoverflow.
On Thu, Nov 5, 2020, at 7:42 AM, Wojtek K wrote:
> Hi All, I'm trying to find the solution but with no success
>
> I have 2 tables related through assoc table
>
> table a
> id |name |
> -----|--------|
> 1 |example |
>
> assoc
> id |a_id | b_id |
> -----|-----|------|
> 1 |1 |1 |
> 2 |1 |2 |
>
> table b
> id |name |
> -----|---------|
> 1 |example1 |
> 2 |example2 |
>
>
> Of course I've mapped classes through orm.
> I want to select all records from a join b and then group by a object and
> aggregate all related records from b to an array of b objects:
>
> ( <model.TableA>, [<model.TableB>, <model.TableB>] )
>
> So far I only found a solution of using some mix of postgresql dialect and sa
> like:
> postgresql.array_agg(func.json_build_object("id", TableB.id, "name",
> TableB.name))
> and I can produce
>
> ( <model.TableA>, [{"id":1, "name": "example1"}, {"id":2, "name":
> "example2"}] )
>
> but ideally would by the array of objects
>
> --
> 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 description.
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