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7 Commits
Author SHA1 Message Date
Robert SpeicherandRobert Speicher 432347426c Merge branch 'update-column-in-batches-where' into 'master' 
Allow customising of queries used for `update_column_in_batches`

This MR makes two changes to `add_column_with_default` and `update_column_in_batches`:

1. `add_column_with_default` no longer wraps the entire set of updates in a single transaction, preventing any locks from sticking around for the duration of the entire transaction
2. `update_column_in_batches` now takes a block which can be used to customise the queries. This uses Arel as messing with raw SQL strings is a total pain

In !4381 there's a need for updating existing rows/columns in a table in batches using a custom `WHERE` condition. Without the changes in this MR this would not be possible.

See merge request !4680
 2016-06-17 14:14:25 -04:00
Yorick Peterse b33b7be53e Handle NULL migration errors in migration helpers 
This ensures that whenever changing the NULL constraint of a column
fails we still drop the column.
 2016-06-13 11:22:58 +02:00
Felipe Artur 9264203103 change add_concurrent_index function arguments 2016-06-06 13:06:21 -03:00
Grzegorz Bizon 9e92b0eead Add specs for migration helpers and boolean values 2016-05-22 22:41:14 +02:00
Grzegorz Bizon 13bf612600 Test migration helpers using a migration class 2016-05-22 22:40:43 +02:00
Yorick Peterse 36083b4d0e Fixed styling per Rubocop pedantics 2016-05-12 13:03:55 +02:00
Yorick Peterse e867099091 Added helper methods for database migrations 
These helpers can be used to perform migrations without taking down the
entire application.

For example, the method "add_column_with_default" can be used to add a
new column with a default value without locking the entire table.
 2016-05-12 12:59:40 +02:00