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| author | Rafael Mendonça França <rafaelmfranca@gmail.com> | 2013-03-06 06:05:47 -0800 |
|---|---|---|
| committer | Rafael Mendonça França <rafaelmfranca@gmail.com> | 2013-03-06 06:05:47 -0800 |
| commit | 4ce98432512d11ac2f0330e2313c2c031552ffff (patch) | |
| tree | 3647f33befa7fd192c4bec020d3f020ffa7386d9 /guides | |
| parent | ac13b4d0f6cc7d4ad12f502dcc29fd1f9c298a4b (diff) | |
| parent | b337390889cb4a9f80ed08daf072a043f0e7ddf3 (diff) | |
| download | rails-4ce98432512d11ac2f0330e2313c2c031552ffff.tar.gz rails-4ce98432512d11ac2f0330e2313c2c031552ffff.tar.bz2 rails-4ce98432512d11ac2f0330e2313c2c031552ffff.zip | |
Merge pull request #9507 from senny/9483_migrations_without_transactions
Transactions can be turned off per Migration
Diffstat (limited to 'guides')
| -rw-r--r-- | guides/source/migrations.md | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/guides/source/migrations.md b/guides/source/migrations.md index 89ae564c24..bd63970bea 100644 --- a/guides/source/migrations.md +++ b/guides/source/migrations.md @@ -61,6 +61,10 @@ migrations are wrapped in a transaction. If the database does not support this then when a migration fails the parts of it that succeeded will not be rolled back. You will have to rollback the changes that were made by hand. +NOTE: There are certain queries that can't run inside a transaction. If your +adapter supports DDL transactions you can use `disable_ddl_transaction!` to +disable them for a single migration. + If you wish for a migration to do something that Active Record doesn't know how to reverse, you can use `reversible`: @@ -180,7 +184,7 @@ end ``` If the migration name is of the form "CreateXXX" and is -followed by a list of column names and types then a migration creating the table +followed by a list of column names and types then a migration creating the table XXX with the columns listed will be generated. For example: ```bash |