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

As Speransky suggested, you should never modify old migration files. Rather you should create a new migration that adds the desired column. For instance, in this case you would run the following command in your app to create the new migration:

rails generate migration AddListIdColumnToIdeas list_id:integer

And Rails would generate the migration file automatically and the only thing left to do is run rake db:migrate.

If you insist on modifying the old migration file, you can add the column as you did and run the following:

rake db:drop
rake db:create
rake db:migrate

Which will destroy your current database, create a new one and run all the migrations (which will include your new column).