Active Record tracks which migrations have already been run so all you have to do is update your source and run rake db:migrate. Active Record will work out which migrations should be run. It will also update your db/schema.rb file to match the structure of your database.
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migrations for schema creation
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validations
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one-to-may association
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many-to-many association
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spec tests
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Schema
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Associations
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Migrations
- symmetric
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TDD models and migrations
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Scrub and import data
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AR queries
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internalize schema
class AddCanFireMissilesFlagToUsers < ActiveRecord::Migration
def change
add_column :users, :can_fire_missiles, :boolean, :default => false
end
end- binary
- boolean
- date
- datetime
- decimal
- float
- integer
- primary_key
- string
- text
- time
- timestamp
Active Record provides methods that perform common data definition tasks in a database independent way:
- add_column
- add_index
- change_column
- change_table
- create_table
- drop_table
- remove_column
- remove_index
- rename_column