On Thu, Apr 13, 2023, at 1:13 PM, Peter Harrison wrote: > Thanks Mike, > > Ideally we'd prefer to find a solution via Graphene-SQLAlchemy. Unfortunately > we don't have the luxury of creating our own query when interacting with > Graphene-SQLAlchemy. > > So the key question for us is, can you modify an existing > sqlalchemy.orm.query.Query object to insert a "func.max(Data.value)" object > into the select?
yes, use the add_columns method https://docs.sqlalchemy.org/en/20/orm/queryguide/query.html#sqlalchemy.orm.Query.add_columns > > > > This is what Graphene-SQLAlchemy is giving us. > If this is possible, then the group_by part is easy. We have tested that > frequently, the hard part is the modifying the original "select" object. > > 1. We have tried add_columns, but that adds in incompatible object type in > the GraphQL results making it an unusable option. I dont know what that means... wouldn't this be an issue for graphene-SQLAlchemy to fix? this is a basic Query method. if you can query individual columns to GraphQL, it should work. Then as stated before, if whatever graphene-sqlalchemy does is not compatible with individual columns, that would have to be resolved on that end. > 2. We thought that modifying the select would be possible using data with > "statement.froms" but can't figure out how to update the MetaData object in it again this is very vague and doesn't make much sense. if you want to add a fromclause to a select() or a query, there's an add_froms() method. This has nothing to do with updating MetaData objects, which are not part of the "froms" of a select and are only a collection that Table objects belong towards, and they have nothing to do with how SELECT statements are rendered. > > If modifying the "select" after its creation is not possible, we need to > start considering using a separate reporting table with hourly data. yes unfortunately I know nothing about graphene-sqlalchemy or graphql and these sound like details that are deeply embedded in a larger system, the people who created this extension would have the best chance of helping with new integrations. -- 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/275f600c-86fd-4870-bf83-79699d4f7164%40app.fastmail.com.
