diff options
Diffstat (limited to 'guides/source/active_record_querying.textile')
| -rw-r--r-- | guides/source/active_record_querying.textile | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/guides/source/active_record_querying.textile b/guides/source/active_record_querying.textile index 14d0ba9b28..de55401c1f 100644 --- a/guides/source/active_record_querying.textile +++ b/guides/source/active_record_querying.textile @@ -695,7 +695,7 @@ Optimistic locking allows multiple users to access the same record for edits, an <strong>Optimistic locking column</strong> -In order to use optimistic locking, the table needs to have a column called +lock_version+. Each time the record is updated, Active Record increments the +lock_version+ column. If an update request is made with a lower value in the +lock_version+ field than is currently in the +lock_version+ column in the database, the update request will fail with an +ActiveRecord::StaleObjectError+. Example: +In order to use optimistic locking, the table needs to have a column called +lock_version+ of type integer. Each time the record is updated, Active Record increments the +lock_version+ column. If an update request is made with a lower value in the +lock_version+ field than is currently in the +lock_version+ column in the database, the update request will fail with an +ActiveRecord::StaleObjectError+. Example: <ruby> c1 = Client.find(1) @@ -1004,7 +1004,7 @@ Scopes are also chainable within scopes: <ruby> class Post < ActiveRecord::Base scope :published, -> { where(:published => true) } - scope :published_and_commented, -> { published.and(self.arel_table[:comments_count].gt(0)) } + scope :published_and_commented, -> { published.where("comments_count > 0") } end </ruby> |