Guide for creating ServiceNow Assignment Rules using the Fluent API. Assignment rules automatically populate empty assignmentgroup or assignedto fields on task or task-inherited tables after a record is saved to the database. Assignment rules do not run if these fields already have values. They execute after the insert or update operation completes.
Guide for creating ServiceNow Data Lookup definitions (dl_definition) using the Fluent API. A Data Lookup connects a source table to a configurable matcher table and defines which source fields are used to find a matching row and which values are copied back to the source record. In simple terms form field change, record insert, and record update. If you find yourself reaching for a Business Rule (for insert/update) plus a Client Script (for onChange) to implement the same deterministic field-population logic, use Data Lookup instead.