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| -rw-r--r-- | guides/source/migrations.textile | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/guides/source/migrations.textile b/guides/source/migrations.textile index a7de21b754..0173f8ecc6 100644 --- a/guides/source/migrations.textile +++ b/guides/source/migrations.textile @@ -81,7 +81,7 @@ it to default to +false+ for new users, but existing users are considered to have already opted in, so we use the User model to set the flag to +true+ for existing users. -h4. Using the change method +h4. Using the +change+ Method Rails 3.1 makes migrations smarter by providing a new <tt>change</tt> method. This method is preferred for writing constructive migrations (adding columns or @@ -351,7 +351,7 @@ end This migration will create a user_id column and appropriate index. -h4. Supported type modifiers +h4. Supported Type Modifiers You can also specify some options just after the field type between curly braces. You can use the following modifiers: @@ -550,7 +550,7 @@ and "<tt>ActiveRecord::ConnectionAdapters::Table</tt>":http://api.rubyonrails.org/classes/ActiveRecord/ConnectionAdapters/Table.html (which provides the methods available on the object yielded by +change_table+). -h4. Using the +change+ Method +h4. When to Use the +change+ Method The +change+ method removes the need to write both +up+ and +down+ methods in those cases that Rails knows how to revert the changes automatically. Currently, @@ -672,7 +672,7 @@ Neither of these Rake tasks do anything you could not do with +db:migrate+. They are simply more convenient, since you do not need to explicitly specify the version to migrate to. -h4. Resetting the database +h4. Resetting the Database The +rake db:reset+ task will drop the database, recreate it and load the current schema into it. @@ -680,7 +680,7 @@ current schema into it. NOTE: This is not the same as running all the migrations - see the section on "schema.rb":#schema-dumping-and-you. -h4. Running specific migrations +h4. Running Specific Migrations If you need to run a specific migration up or down, the +db:migrate:up+ and +db:migrate:down+ tasks will do that. Just specify the appropriate version and @@ -695,7 +695,7 @@ will run the +up+ method from the 20080906120000 migration. This task will first 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 +h4. Changing the Output of Running Migrations By default migrations tell you exactly what they're doing and how long it took. A migration creating a table and adding an index might produce output like this |