peewee.ProgrammingError: missing FROM-clause entry for table "t1"

query3 = Bookchapter.select(
    Bookchapter.id,
    Bookchapter.chapter,
)

Books.insert_from(query3, fields=[
    Books.id,
    Books.chapter
]).on_conflict(
    conflict_target=[Books.id],
    update={Books.chapter: Bookchapter.chapter}
).execute()

[coleifer]

The proper way to write this is to reference the “new” update-value using EXCLUDED. Peewee provides a shortcut, which is the preserve option.

Books.insert_from(query3, fields=[
    Books.id,
    Books.chapter
]).on_conflict(
    conflict_target=[Books.id],
    preserve=[q.c.name]  # Note we're referencing the name here.
)

You can also write:

.on_conflict(
    conflict_target=[Books.id],
    preserve=['name']  # Name of column to preserve ("carry over") from insert.
)

[coleifer]

I thought you said it was not working. Please share the sql to a version of the query that works.