SQLAlchemy array aggregate of objects

[Wojtek K]

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

[Mike Bayer]

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.

--

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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