| Module | ActiveRecord::Locking::Optimistic::ClassMethods |
| In: |
vendor/rails/activerecord/lib/active_record/locking/optimistic.rb
|
| DEFAULT_LOCKING_COLUMN | = | 'lock_version' |
# File vendor/rails/activerecord/lib/active_record/locking/optimistic.rb, line 104
104: def self.extended(base)
105: class <<base
106: alias_method_chain :update_counters, :lock
107: end
108: end
The version column used for optimistic locking. Defaults to lock_version.
# File vendor/rails/activerecord/lib/active_record/locking/optimistic.rb, line 125
125: def locking_column
126: reset_locking_column
127: end
Is optimistic locking enabled for this table? Returns true if the lock_optimistically flag is set to true (which it is, by default) and the table includes the locking_column column (defaults to lock_version).
# File vendor/rails/activerecord/lib/active_record/locking/optimistic.rb, line 114
114: def locking_enabled?
115: lock_optimistically && columns_hash[locking_column]
116: end
Quote the column name used for optimistic locking.
# File vendor/rails/activerecord/lib/active_record/locking/optimistic.rb, line 130
130: def quoted_locking_column
131: connection.quote_column_name(locking_column)
132: end
Reset the column used for optimistic locking back to the lock_version default.
# File vendor/rails/activerecord/lib/active_record/locking/optimistic.rb, line 135
135: def reset_locking_column
136: set_locking_column DEFAULT_LOCKING_COLUMN
137: end
Set the column to use for optimistic locking. Defaults to lock_version.
# File vendor/rails/activerecord/lib/active_record/locking/optimistic.rb, line 119
119: def set_locking_column(value = nil, &block)
120: define_attr_method :locking_column, value, &block
121: value
122: end
Make sure the lock version column gets updated when counters are updated.
# File vendor/rails/activerecord/lib/active_record/locking/optimistic.rb, line 141
141: def update_counters_with_lock(id, counters)
142: counters = counters.merge(locking_column => 1) if locking_enabled?
143: update_counters_without_lock(id, counters)
144: end