Question

Recently I removed a column abc from one of my tables using rake db:migrate, remove_column on self.up. The column has been successfully removed.

While I try to add an entry to the table, I have this error:

ActiveRecord::StatementInvalid (Mysql::Error: Unknown column 'abc' in 'field list': 
INSERT INTO...

It was trying to write on that column, though it doesn’t exist anymore. I have checked all my models and confirmed abc doesn’t exist anymore. Also checked schema.rb and abc has been removed.

Answer 1

When you change something like this on production, you must reload the application… If you are using Phusion Passenger, you do it by running:

touch tmp/restart.txt