Insert into an Oracle table no working

I ran into a similar problem. I created a new ROR app that had to
work with an existing legacy database (Oracle). The db has a members
table. The primary key was already named 'mem_id'.

So, in my model I have:
  set_table_name "members"
  set_primary_key "mem_id"

  set_sequence_name "mem_id_seq"

It works after I added set_sequence_name. I got the same Oracle
'sequence does not exist error' before I added that.

good luck.