Methods
E
L
Q
R
S
U
Constants
DEFAULT_LOCKING_COLUMN = 'lock_version'
 
Class Public methods
extended(base)
# File activerecord/lib/active_record/locking/optimistic.rb, line 138
def self.extended(base)
  class <<base
    alias_method_chain :update_counters, :lock
  end
end
Instance Public methods
locking_column()

The version column used for optimistic locking. Defaults to lock_version.

# File activerecord/lib/active_record/locking/optimistic.rb, line 159
def locking_column
  reset_locking_column
end
locking_enabled?()

Is optimistic locking enabled for this table? Returns true if the lock_optimisticallyflag is set to true (which it is, by default) and the table includes the locking_columncolumn (defaults to lock_version).

# File activerecord/lib/active_record/locking/optimistic.rb, line 148
def locking_enabled?
  lock_optimistically && columns_hash[locking_column]
end
quoted_locking_column()

Quote the column name used for optimistic locking.

# File activerecord/lib/active_record/locking/optimistic.rb, line 164
def quoted_locking_column
  connection.quote_column_name(locking_column)
end
reset_locking_column()

Reset the column used for optimistic locking back to the lock_versiondefault.

# File activerecord/lib/active_record/locking/optimistic.rb, line 169
def reset_locking_column
  set_locking_column DEFAULT_LOCKING_COLUMN
end
set_locking_column(value = nil, &block)

Set the column to use for optimistic locking. Defaults to lock_version.

# File activerecord/lib/active_record/locking/optimistic.rb, line 153
def set_locking_column(value = nil, &block)
  define_attr_method :locking_column, value, &block
  value
end
update_counters_with_lock(id, counters)

Make sure the lock version column gets updated when counters are updated.

# File activerecord/lib/active_record/locking/optimistic.rb, line 175
def update_counters_with_lock(id, counters)
  counters = counters.merge(locking_column => 1) if locking_enabled?
  update_counters_without_lock(id, counters)
end