odba - cache.rb

odba - cache.rb

    # Returns all objects designated by _bulk_fetch_ids_ and registers 
    # _odba_caller_ for each of them. Objects which are not yet loaded are loaded
    # from ODBA#storage.

    def bulk_fetch(bulk_fetch_ids, odba_caller)
      instances = []
      loaded_ids = []
      bulk_fetch_ids.each { |id|
        if(entry = fetch_cache_entry(id))
          entry.odba_add_reference(odba_caller)
          instances.push(entry.odba_object)
          loaded_ids.push(id)
        end
      }
      bulk_fetch_ids -= loaded_ids
      unless(bulk_fetch_ids.empty?)
        rows = ODBA.storage.bulk_restore(bulk_fetch_ids)
        instances += bulk_restore(rows, odba_caller)
      end
      instances
    end

a = [1,2,3]
b = [3,4,5]

a -= b

p a

this will result in [1,2]