| 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 101
101: def self.extended(base)
102: class <<base
103: alias_method_chain :update_counters, :lock
104: end
105: end
The version column used for optimistic locking. Defaults to lock_version.
# File vendor/rails/activerecord/lib/active_record/locking/optimistic.rb, line 122
122: def locking_column
123: reset_locking_column
124: 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 111
111: def locking_enabled?
112: lock_optimistically && columns_hash[locking_column]
113: end
Quote the column name used for optimistic locking.
# File vendor/rails/activerecord/lib/active_record/locking/optimistic.rb, line 127
127: def quoted_locking_column
128: connection.quote_column_name(locking_column)
129: 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 132
132: def reset_locking_column
133: set_locking_column DEFAULT_LOCKING_COLUMN
134: end
Set the column to use for optimistic locking. Defaults to lock_version.
# File vendor/rails/activerecord/lib/active_record/locking/optimistic.rb, line 116
116: def set_locking_column(value = nil, &block)
117: define_attr_method :locking_column, value, &block
118: value
119: end
make sure the lock version column gets updated when counters are updated.
# File vendor/rails/activerecord/lib/active_record/locking/optimistic.rb, line 138
138: def update_counters_with_lock(id, counters)
139: counters = counters.merge(locking_column => 1) if locking_enabled?
140: update_counters_without_lock(id, counters)
141: end