Migrations In3 Mins

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Information about Migrations In3 Mins

Published on May 18, 2008

Author: hiremaga

Source: slideshare.net


The slides from a very short presentation I did at the Melbourne Ruby User Group's Nuby Night.


Why Migrations?


Agility Incrementally improve your schema

$ script/generate migration create_bids

$ script/generate migration create_bids $RAILS_ROOT/db/migrate/001_create_bids.rb

$ rake db:migrate

$ rake db:migrate $ rake db:migrate VERSION=0

Transformations create_table(name, options) drop_table(name) add_column(table_name, column_name, type, options) remove_column(table_name, column_name)

More... rename_table(old_name, new_name) rename_column(table_name, column_name, new_column_name) change_column(table_name, column_name, type, options)

And then some. add_index(table_name, column_names, index_type, index_name) remove_index(table_name, index_name)

I'm Abhi from Cogent Consulting. Thank You.

$RAILS_ROOT/db/migrate/001_create_bids.rb $ rake db:migrate VERSION=N

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