From(collection)
          .where("item.some_boolean or (item.other_boolean and item.another_boolean)")
          .order_by("item.some_order_property")
          .select("name","age","sex","salary")
 
# This query returns a new collection transformed from the original.
# The items in this new collection are from a class called
# Dynamic_Item and feature only the four selected properties,
# instead of all the properties of the original items in 'collection'.
# The where clause is observed as well, since only the items that
# the given clause evaluates to true are returned.