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[ci skip] add doc for STEP in migration

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This commit is contained in:
Aditya Kapoor 2014-08-21 01:01:45 +05:30
parent 2b7d67d49d
commit eb9f1ef84f
1 changed files with 6 additions and 3 deletions
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9
activerecord/lib/active_record/migration.rb
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@ -181,9 +181,12 @@ module ActiveRecord
#
# To roll the database back to a previous migration version, use
# <tt>rake db:migrate VERSION=X</tt> where <tt>X</tt> is the version to which
# you wish to downgrade. If any of the migrations throw an
# <tt>ActiveRecord::IrreversibleMigration</tt> exception, that step will fail and you'll
# have some manual work to do.
# you wish to downgrade. Alternatively, you can also use the STEP option if you
# wish to rollback last few migrations. <tt>rake db:migrate STEP=2</tt> will rollback
# the latest two migrations.
#
# If any of the migrations throw an <tt>ActiveRecord::IrreversibleMigration</tt> exception,
# that step will fail and you'll have some manual work to do.
#
# == Database support
#