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Contents
Description:
Generates a new database migration. Pass the migration name, either
CamelCased or under_scored, and an optional list of attribute pairs as arguments.
A migration class is generated in db/migrate prefixed by a timestamp of the current date and time.
You can name your migration in either of these formats to generate add/remove
column lines from supplied attributes: AddColumnsToTable or RemoveColumnsFromTable
Example:
`bin/rails generate migration AddSslFlag`
If the current date is May 14, 2008 and the current time 09:09:12, this creates the AddSslFlag migration
db/migrate/20080514090912_add_ssl_flag.rb
`bin/rails generate migration AddTitleBodyToPost title:string body:text published:boolean`
This will create the AddTitleBodyToPost in db/migrate/20080514090912_add_title_body_to_post.rb with this in the Change migration:
add_column :posts, :title, :string
add_column :posts, :body, :text
add_column :posts, :published, :boolean
Migration names containing JoinTable will generate join tables for use with
has_and_belongs_to_many associations.
Example:
`bin/rails g migration CreateMediaJoinTable artists musics:uniq`
will create the migration
create_join_table :artists, :musics do |t|
# t.index [:artist_id, :music_id]
t.index [:music_id, :artist_id], unique: true
end
Version data entries
77 entries across 72 versions & 7 rubygems