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体验新版 GitCode,发现更多精彩内容 >>
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2fd540a2
编写于
7月 19, 2008
作者:
H
Hongli Lai (Phusion)
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差异文件
Improve documentation of ActiveRecord::Rollback.
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038c7fde
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+27
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activerecord/lib/active_record/base.rb
activerecord/lib/active_record/base.rb
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activerecord/lib/active_record/base.rb
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2fd540a2
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@@ -83,8 +83,33 @@ class ConfigurationError < ActiveRecordError
class
ReadOnlyRecord
<
ActiveRecordError
end
# Used by Active Record transaction mechanism to distinguish rollback from other exceptional situations.
# You can use it to roll your transaction back explicitly in the block passed to +transaction+ method.
# ActiveRecord::Transactions::ClassMethods.transaction uses this exception
# to distinguish a deliberate rollback from other exceptional situations.
# Normally, raising an exception will cause the +transaction+ method to rollback
# the database transaction *and* pass on the exception. But if you raise an
# ActiveRecord::Rollback exception, then the database transaction will be rolled back,
# without passing on the exception.
#
# For example, you could do this in your controller to rollback a transaction:
#
# class BooksController < ActionController::Base
# def create
# Book.transaction do
# book = Book.new(params[:book])
# book.save!
# if today_is_friday?
# # The system must fail on Friday so that our support department
# # won't be out of job. We silently rollback this transaction
# # without telling the user.
# raise ActiveRecord::Rollback, "Call tech support!"
# end
# end
# # ActiveRecord::Rollback is the only exception that won't be passed on
# # by ActiveRecord::Base.transaction, so this line will still be reached
# # even on Friday.
# redirect_to root_url
# end
# end
class
Rollback
<
ActiveRecordError
end
...
...
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