Module attributes 

Custom attributes (feature 5): definitions maintained by administrators and the validation of values against them.

Values live in revisions.attributes (JSON object by key), so they are versioned with the revision like name, material and mass: frozen once released, copied by revise and Save as. The key and the data type of a definition never change after it was created; label, unit, choices, item types, order and the active flag do. Deactivating keeps stored values visible, it only stops offering the attribute.

Structs

AttributeSettings

The editable part of a definition.

Functions

applies_to

Whether the definition applies to items of item_type.

create

Creates a definition (administrators).

for_item_type

Active definitions for items of item_type – the fields of the forms.

get

get_by_key

list

All definitions in display order; active_only leaves out deactivated ones.

update

Changes label, unit, choices, item types, order and the active flag (administrators). Key and data type stay.

usage

How many revisions store a value of the attribute.