Ruby on Rails: adding columns to existing database

Question

I\'m getting an error:

SQLite3::SQLException: no such column: ideas.list_id: 
SELECT \"ideas\".* FROM \"ideas\"  
WHERE \"ideas\".\"list_id\" = 2

Answer 1

migration file name has the datetime encoded in its name so rails run this migration one and do not run it again unless you do a rollback

and here come the magic of migration to build you db with small steps so no need to update a migration after run rake db:migrate , you should make a new migration to do the change you want to your db schema

and remember to

remove the added line form the old migration file as it might raise errors if you decided to rollback this migration