PonyORM: Mapping is not generated for entity ‘User’

Question

I’m trying to learn and build small app with PonyOrm and Flask. For that I’ve copied example app from Pony’s GitHub. But I still get the same error:

pony.orm.core.ERDiagramError: Mapping is not generated for entity 'User'

I’ve been looking for answers on Google and in Pony documentation, to no avail.

Answer 1

Add this line after the creation of the entity and before you tries to map:

db.generate_mapping(create_tables=True) # create tables

Worked for me.