How to return all the columns with flask-sqlalchem

问题:

I'm trying to do a join from two tables in flask-sqlalchemy and I want all the columns from both tables but if I execute:

Company.query.join(Buyer, Buyer.buyer_id == Company.id).all()

I have only the columns from Company (It returns, in fact, a Company object).

I know I can do something like:

Company.query.join(Buyer, Buyer.buyer_id == Company.id) \
             .add_columns(Buyer.id, Buyer.name, etc..).all()

It returns in this case:

(<Company 2>, 1, 'S67FG', etc..)

the problem is that I have a lot of columns and also I don't know how to marshmallow the returned obj with flask-marshmallow (with nested fields does not work).

Is there a way to return a new obj with columns from the two tables? What is for you the best way to manage these situations?

Any suggestion is highly appreciated. Thanks

回答1:

at the end I've achieved this by using this simple sqlalchemy query:

db.session.query(Company, Buyer).join(Buyer, Buyer.buyer_id == Company.id).all()

It returns:

(<Company 2>, <Buyer 1, 2>)