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体验新版 GitCode,发现更多精彩内容 >>
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e0672a8e
编写于
4月 07, 2012
作者:
V
Vijay Dev
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...
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@@ -51,7 +51,7 @@ end
This migration adds a table called +products+ with a string column called +name+
and a text column called +description+. A primary key column called +id+ will
also be added, however since this is the default we do not need to explicitly
write for this
.
also be added, however since this is the default we do not need to explicitly
specify it
.
The timestamp columns +created_at+ and +updated_at+ which Active Record
populates automatically will also be added. Reversing this migration is as
simple as dropping the table.
...
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@@ -65,7 +65,7 @@ class AddReceiveNewsletterToUsers < ActiveRecord::Migration
change_table :users do |t|
t.boolean :receive_newsletter, :default => false
end
User.update_all :receive_newsletter =>
true
User.update_all :receive_newsletter => true
end
def down
...
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@@ -636,9 +636,8 @@ $ rake db:migrate:up VERSION=20080906120000
</shell>
will run the +up+ method from the 20080906120000 migration. This task will first
check whether the migration is already performed, so for example
+db:migrate:up VERSION=20080906120000+ will do nothing if Active Record believes
that 20080906120000 has already been run.
check whether the migration is already performed and will do nothing if Active Record believes
that it has already been run.
h4. Changing the output of running migrations
...
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