Rails Migration Tips and Examples (not a full step by step)

Generates the model and migration, but also all of the RCAVs for index, show, create, update, and destroy.

• The model name must be singular.
• Separate column names and datatypes with colons (NO SPACES).
• Separate name:datatype pairs with spaces (NO COMMAS).

rails generate draft:resource <MODEL_NAME_SINGULAR> <COLUMN_1_NAME>:<COLUMN_1_DATATYPE> <COLUMN_2_NAME>:<COLUMN_2_DATATYPE> # etc

EX:
rails generate draft:resource board name:string
        OR
rails generate draft:resource post title:string body:text expires_on:date board_id:integer

Execute the generated migrations with:

rake db:migrate

This will remove all the files that rails generate draft:resource post ... had previously added. You can then correct your error and re-generate from scratch.

rails destroy draft:resource post

If you made a mistake when generating your draft:resource AND you’ve already run rake db:migrate, then first you have to run the command:

rake db:rollback

Adding and Removing columns

Ex:
rails g migration AddImageToPosts
    OR
rails g migration RemoveExpiresOnFromPosts

• If your database gets into a weird state (usually caused by deleting old migration files), your ultimate last resort is
• This will destroy your entire database and all the data within it. Then, you can fix your migrations and re-run all from scratch with rake db:migrate, then rake sample_data to recover the sample data.

rake db:drop