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Item Instance issues
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1) Introduction
Item instance functionality allows you to represent multiple
'copies' of the same item. For example you may have more than
one copy of Gladiator in your database. The actual ownership
of items is represented at the item_instance level, so you
can also have multiple instances of an item with different
owners.
For example, three different people might have Gladiator, and
instead of having three distinct items, with reviews as well,
you can have one, and have the item instances referencing it
for each owner.
2) Configuration
Two config variables $CONFIG_VARS['item_input.item_instance_support'] and
$item_input['new_instance_owner_only'] have been added to control
whether you want to enable this functionality and whether instances
can be across owners. You will notice a few small changes to
item_display.php, especially the 'Status Info:', is now 'Instance Info'.
When item_instance_support is active all item_instances for the current
title will be displayed. The actual item_instance being edited (For
s_status_type,etc) will be highlighted with a tick.
Setting $CONFIG_VARS['item_input.new_instance_owner_only']=TRUE, only affects the
creation of new instances. All existing instances will be displayed
in the 'Instance Info' section of item_display.php regardless of
owner. This only happens if $CONFIG_VARS['item_input.new_instance_owner_only'] was
once set to FALSE.
When a user chooses to 'Delete Item', they are actually deleting the item
instance. If once the item instance is deleted, no more instances exist,
the item will also be deleted.
3) Issues
If there are two instance of an item, and the first one is deleted,
the item_instance instance_no will still be 2.
If you have $item_input['new_instance_owner_only']=FALSE users besided the
original owner can add a new instances (copies) of an item and then edit
the actual item contents as a result.
If a user updates an instance of an item, and attributes, etc are
reflected for all instances.
If the system allows instances belonging to two different users to
be linked to the one item, then both users have the right to update
records. This creates problems when both users are attempting to
update a record at once. If one user deletes the item, and
another user submits a clone request for the item, the second action
will not work, and the user will lose their work.
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