Hi guys!
I use PostgreSQL. I want to create an auto-increment field started from
1000, increment by 2.
My not working code:
class MyTable(db.Model):
__tablename__ = 'my_table'
id_seq = Sequence('my_table_id_seq', start=1000, increment=2)
id = db.Column(db.Integer, id_seq, server_default=id_seq.next_value(),
primary_key=True)
In my autogenerated migration scrip I see this (which will obviously not
work, because there is no definition for my_table_id_seq):
def upgrade():
# ### commands auto generated by Alembic - please adjust! ###
op.create_table('my_table',
sa.Column('id', sa.Integer(),
server_default=sa.text("nextval('my_table_id_seq')"), nullable=False),
sa.PrimaryKeyConstraint('id')
)
# ### end Alembic commands ###
If I run it, I get expected error:
File
"/Users/maxb/Projects/ANDR3/Andr3Admin/venv/lib/python3.6/site-packages/sqlalchemy/engine/default.py",
line 507, in do_execute
cursor.execute(statement, parameters)
sqlalchemy.exc.ProgrammingError: (psycopg2.ProgrammingError) relation
"my_table_id_seq" does not exist
[SQL: "\nCREATE TABLE my_table (\n\tid INTEGER DEFAULT
nextval('my_table_id_seq') NOT NULL, \n\tPRIMARY KEY (id)\n)\n\n"]
(Background on this error at: http://sqlalche.me/e/f405)
So, how do I code it to have expected behaviour?
Thanks in advance!
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