how to use QuerySelectField in flask?

Question

I am trying to have a select field filled with the results of a sqlalchemy request in a flask form.

Here are the code :

def possible_book():
    retu         


        

Answer 1

One possible problem is that wtforms.ext.sqlalchemy.fields.QuerySelectField expects a SQLAlchemy query object, not a materialized list. Simply remove the all() call from your possible_book return to return an unmaterialized query to WTForms:

def possible_book():
    return Book.query.with_entities(Book.id)