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The up method included the the logic of what to change in the database, while the down method included the logic on how to revert that change.
Using the change method, one only needs to specify the up logic for the majority of use cases.
Rails gives us tons of helper methods to format prices and get things done, and that’s definitely the path to follow.
Let’s generate the scaffold again, with some corrections. We would have to delete them and recreate again the whole schema by running and rerun the generate again and again… At this stage we’ve got the point: it’s better to do it manually!
Migrations are stored as files in the db/migrate directory, one for each migration class. Basically, it’s almost the same question I had before writing this post. If you are still not convinced, you can check this question on Stack Overflow.This is probably not desirable in most of cases, but I assure you can safely try this path if you are in a early stage of development, or if you are ok with the default (generated) Rails’ views.
So, whatever, if you don’t want to It looks fine, except for one thing: there’s no data displayed! A primary key column called id will also be added, as it's the default primary key for all Active Record models.