Open object by property value

If Class has unique index f.e. on property value IndexNameOpen method
is generated to support openings by index value

Author: evshvarov

CHEAT.md

@@ -9,6 +9,8 @@ Some most encountered COS expressions
 | Call an instance method                      | `Do object.method(arguments)`<br>`Set variable = object.method(arguments)`<br>Note: place a . before each pass-by-reference argument |
 | Create a new object                          | `Set object = ##class(package.class).%New()`                                      |
 | Open an existing object                      | `Set object = ##class(package.class).%OpenId(id, concurrency, .status)`           |
+| Open an existing object by unique index value | `Set object = ##class(package.class).IndexNameOpen(value, concurrency, .status)`           |
+
 | Save an object                               | `Set status = object.%Save()`                                                     |
 | Retrieve the ID of a saved object            | `Set id = object.%Id()`                                                           |
 | Retrieve the OID of a saved object           | `Set oid = object.%Oid()`                                                         |