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| author | Vijay Dev <vijaydev.cse@gmail.com> | 2012-09-09 17:38:47 +0530 |
|---|---|---|
| committer | Vijay Dev <vijaydev.cse@gmail.com> | 2012-09-09 17:38:47 +0530 |
| commit | cb524dc1d7525a26ecea8cf049757e530f0d4026 (patch) | |
| tree | 3a2d8727e97c67e37a357c1cf180e9ca17cff28b /guides/source/migrations.textile | |
| parent | 6107407e66aa68cf269ec00b64d7ab3623465b97 (diff) | |
| parent | 2db79dc9ea0b623c6d76b72e85f58efd63b50e08 (diff) | |
| download | rails-cb524dc1d7525a26ecea8cf049757e530f0d4026.tar.gz rails-cb524dc1d7525a26ecea8cf049757e530f0d4026.tar.bz2 rails-cb524dc1d7525a26ecea8cf049757e530f0d4026.zip | |
Merge branch 'master' of github.com:lifo/docrails
Conflicts:
activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb
Diffstat (limited to 'guides/source/migrations.textile')
| -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 587be269f7..e89bde7a83 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 |