Add optimistic locking to model By default, it uses column lock_version : Int32 as lock The column used as lock must be type Int32 or Int64 and the default value of 0 You can use a different column name as lock by passing the column name to the method.

class MyModel < Jennifer::Model::Base
  with_optimistic_lock

  mapping(
    id: {type: Int32, primary: true},
    lock_version: {type: Int32, default: 0},
  )
end

Or use a custom column name for the locking column:

class MyModel < Jennifer::Model::Base
  with_optimistic_lock :custom_lock

  mapping(
    id: {type: Int32, primary: true},
    custom_lock: {type: Int32, default: 0},
  )
end