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Improve documentation for IrreversibleMigrations. Closes #9636 [toolmantim]

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git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@8129 5ecf4fe2-1ee6-0310-87b1-e25e094e27de
This commit is contained in:
Michael Koziarski 2007-11-11 21:31:59 +00:00
parent 3104291322
commit a406643b95
1 changed files with 3 additions and 3 deletions
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6
activerecord/lib/active_record/migration.rb
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@ -85,7 +85,7 @@ def initialize(name)
# == Irreversible transformations
#
# Some transformations are destructive in a manner that cannot be reversed. Migrations of that kind should raise
# an <tt>IrreversibleMigration</tt> exception in their +down+ method.
# an <tt>ActiveRecord::IrreversibleMigration</tt> exception in their +down+ method.
#
# == Running migrations from within Rails
#
@ -105,7 +105,7 @@ def initialize(name)
# 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>IrreversibleMigration</tt> exception, that step will fail and you'll
# <tt>ActiveRecord::IrreversibleMigration</tt> exception, that step will fail and you'll
# have some manual work to do.
#
# == Database support
@ -124,7 +124,7 @@ def initialize(name)
#
# def self.down
# # not much we can do to restore deleted data
# raise IrreversibleMigration
# raise ActiveRecord::IrreversibleMigration, "Can't recover the deleted tags"
# end
# end
#