**New Developers Working Group**
====== Add Fields to Existing Table ======

This example came from a need that PINES had for annual reports purposes. It adds two new fields to the Organizational Unit table in order to store federal library codes for each location and make those codes available to the reports engine. 

[[https://git.evergreen-ils.org/?p=evergreen/pines.git;a=commit;h=701177c67fa6bde4ce19a31d30e3d896eb134a7a| PINES git branch that shows complete files]]

===== 1. Update the fieldmapper =====

File location: Open-ILS\examples\fm_IDL.xml

Add the fields in the "class id="aou"" section: 

''<field reporter:label="Hours of Operation" name="hours_of_operation" oils_persist:virtual="true" reporter:datatype="link"/>''\\
**''<field name="fscskey" reporter:label="FSCSKEY" reporter:datatype="text"/>''**\\
**''<field name="fscs_seq" reporter:label="FSCS_SEQ" reporter:datatype="text"/>''**\\
''</fields>''

The field name must match the column name that you add to the database table. The 'reporter:label' text is what will appear in the list when you are building report templates. 

===== 2. Update the schema =====

New installations of Evergreen will use the code in the Pg folder when the database tables are created. If you are creating a new table for a brand new feature, you'll most likely need to create a new schema file, but in this case we are updating an existing table in the actor schema.

File location: Open-ILS\src\sql\Pg\005.schema.actors.sql

Add the fields to the field list in the "CREATE TABLE actor.org_unit" section of SQL:

''email	TEXT,''\\
''phone TEXT,''\\
**''fscskey TEXT,''\\
''fscs_seq TEXT,''**\\
''opac_visible	BOOL''


===== 3. Edit seed data and create an upgrade script =====

Updates to the seed data files as well as upgrade scripts are required for any changes to the schema or seed data. (The seed data files are used for fresh installs and the upgrade scripts are used by existing installations that are upgrading.)

File location: Open-ILS\src\sql\Pg\upgrade\XXXX.federal_codes.sql

''BEGIN;''\\
''ALTER TABLE actor.org_unit ADD COLUMN fscskey TEXT, ADD COLUMN fscs_seq TEXT;''\\
''COMMIT;''

If you are developing an upgrade script to submit to the Evergreen community, the new upgrade script you create will likely be more complicated. See other examples in the upgrade folder. The "XXXX" in the file name is a placeholder - when the core committers add it to man, they will assign it a number. 

For more information on upgrade scripts, see [[newdevs:db:upgrade_scripts|Database upgrade scripts]]