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evergreen-admin:customization:indb-circ

INDB Circulation (DRAFT)

WARNING: This has not been updated for various changes in 2.2+.

Tables

config.circ_matrix_matchpoint

The circ matrix matchpoint table could be seen as being split into several sections. Over time features are added, and thus a version for when the column was added is included.

To start with, every row has an id and whether or not it is active:

Column Name Column Description Requires Version
id Matchpoint ID 1.6+
active Is matchpoint active? 1.6+

Then there are the "match values". With the exception of grp and org_unit, every one of these can be null to indicate that they don't matter. The most basic rule thus only sets grp and org_unit.

Column Name Column Description Requires Version
grp User Permission Group the matchpoint applies to (primary only) 1.6+
org_unit Org Unit, owning and applied to 1.6+
copy_owning_lib Owning Library of the call number 2.0+
copy_circ_lib Copy Circulation Library 2.0+
usr_home_ou User Home Library 2.1+
is_renewal Is this circ a renewal? 1.6+
juvenile_flag Is the user flagged as juvenile? 1.6+
circ_modifier Copy Circulation Modifier 1.6+
marc_type Copy circ as type if set, otherwise rec descriptor item type 1.6+
marc_form rec descriptor item form 1.6+
marc_vr_format rec descriptor videorecording format 1.6+
ref_flag Copy reference flag 1.6+
usr_age_lower_bound User minimum age based on DOB 1.6+
usr_age_upper_bound User maximum age based on DOB 1.6+

Then there are the "result values" that determine the circ parameters and if the circ is allowed. Pre-2.1 only the script test, hold ratio, and hard due date values could be set to null. In 2.1+ they can all be set to null for fallthrough purposes (though script_test does not fall through).

Column Name Column Description Requires Version
circulate Is the item allowed to circulate 1.6+
duration_rule The id of the rule to use from config.rule_circ_duration 1.6+
recurring_fine_rule The id of the rule to use from config.rule_recurring_fine 1.6+
max_fine_rule The id of the rule to use from config.rule_max_fine 1.6+
hard_due_date The id of the rule to use from config.hard_due_date 1.6.2+
renewals Override for max renewals 2.1+
grace Override for grace period 2.1+
total_copy_hold_ratio If there are holds, and ratio of copies to holds is less than this, deny circulation 2.0+
available_copy_hold_ratio If there are holds, and the ratio of available copies to holds is less than this, deny circulation 2.0+
script_test Currently unused(?) 1.6+

config.circ_matrix_circ_mod_test

The circ matrix circ mod test table is used to limit checkouts by circ modifier or circ modifier set. It has so far remained unchanged since 1.6.

Column Name Column Description
id Circ Mod Test ID
matchpoint Linked matchpoint from config.circ_matrix_matchpoint
items_out Max number of items out for this test

config.circ_matrix_circ_mod_test_map

The circ matrix circ mod test map table links circulation modifier values to the test table

Column Name Column Description
id Circ Mod Test Map ID
circ_mod_test Linked circ mod test from config.circ_matrix_circ_mod_test
circ_mod The Circulation Modifier from config.circ_modifier.code

Circulation Rules/Allowed Check

Lookups are done by way of a call to action.item_user_circ_test or action.item_user_renew_test. Each of these takes three parameters:

  1. The Context OU, where the circulation is occuring, as an integer
  2. The item to be circulated's database ID
  3. The database ID of the user the circulation is for

They then call a second variant of action.item_user_circ_test. This one takes a fourth parameter for "is a renewal", which is only set to true in the action.item_user_renew_test variant. No other information is passed in, and all decisions must then be made with those few pieces of information or information that can be gathered by using them.

action.item_user_circ_test returns a set of data:

Field Description Requires Version
success True if circulation should go through, false if there is a failure 1.6+
matchpoint The ID of the most specific matchpoint found. This will be the only matchpoint pre-2.1. 1.6+
fail_part String identifying why success was false 1.6+
duration_rule The ID of the duration rule matched 2.1+
recurring_fine_rule The ID of the recurring fine rule matched 2.1+
max_fine_rule The ID of the max fine rule matched 2.1+
hard_due_date The ID of the hard due date rule matched 2.1+
renewals The renewals override (if any) 2.1+
grace The grace period override (if any) 2.1+
buildrows Ordered array of rows used to generate the above 2.1+

If success is true only one row should be returned. If success is false one or more rows may be returned, depending on the number of failure points. Pre-2.1 the sole returned matchpoint is then loaded with fleshing to obtain results, 2.1+ loads the various pieces returned instead.

fail_part can be one of the following:

fail_part Description Requires Version
A Standing Penalty Name The user has an active standing penalty preventing circulation 1.6+
actor.usr.barred The user is barred 1.6+
asset.copy.circulate The copy is set to not circulate 1.6+
asset.copy.status The copy is in the wrong status 1.6+
asset.copy_location.circulate The copy's location is set to not circulate 1.6+
config.circ_matrix_circ_mod_test The user has too many items out matching the circ mod rules 1.6+
config.circ_matrix_test.available_copy_hold_ratio The available copy count to hold count ratio is too small 2.0+
config.circ_matrix_test.circulate The returned matchpoint has the circulate flag set to false 1.6+
config.circ_matrix_test.total_copy_hold_ratio The total copy count to hold count ratio is too small 2.0+
no_item The item was not found - Bails out 1.6+
no_matchpoint No matchpoint was found 1.6+
no_user The user was not found - Bails out 1.6+

Matchpoint Lookup

The matchpoint used for the circulation rules above is located, or built, by action.find_circ_matrix_matchpoint. This function takes the context ou, the item's database ID, the user's database ID, and a boolean stating if the circulation is a renewal. It then searches the config.circ_matrix_matchpoint table for a corresponding matchpoint (or matchpoints) to return back to action.item_user_circ_test.

With the exception of the user's permission group and the context org unit all of the "match values" can be set to null to indicate that the rule isn't limited to something matching them. This means it is a good idea to always have at least one rule set to the top of the user permission tree and the top of the organizational unit tree with no other match values set that defines the overall defaults for in the event no other rule matches.

Pre-2.1

Pre-2.1 the various match values are weighted in a somewhat strict fashion:

  1. User's Permission Group (grp) - Used as the outermost check, the matchpoint finding "walks" up the user permission group tree starting at the permission group in the user's profile
  2. Context OU (org_unit) - Used as the second check, by increasing proximity (0 is exact match and is first, parent is 1, parent of parent is 2, etc)
  3. Weighted values - In Descending order of weight added up from the following:
    1. copy_owning_lib - 256/(proximity + 1) - exact match will be weight 256, parent will be weight 128, parent of parent will be weight 85.3, etc
    2. copy_circ_lib - 256/(proximity + 1) - exact match will be weight 256, parent will be weight 128, parent of parent will be weight 85.3, etc
    3. is_renewal: 128 if set
    4. juvenile_flag: 64 if set
    5. circ_modifier: 32 if set
    6. marc_type: 16 if set
    7. marc_form: 8 if set
    8. marc_vr_format: 4 if set
    9. ref_flag: 2 if set
    10. usr_age_lower_bound: 0.5 if set
    11. usr_age_upper_bound: 0.5 if set

2.1+

By default the same general calculation is done in 2.1+ as in Pre-2.1, but with the addition of the user_home_ou field being treated like the copy owning and circ libraries. However, 2.1 includes Dynamic Weighting, which allows for the values used to vary by the value of the Context OU (org_unit). This also allows for the grp and org_unit fields to be less important than other fields for ordering purposes.

In addition, in the event of a tie, 2.1+ does a final sort on the rule ID number, to ensure consistent sorting.

Rule Migration

To 2.0

Migrating from 1.6 to 2.0 is a matter of doing nothing. All previous rules should function exactly as they did before, and you can begin to take advantage of the new fields available in 2.0.

To 2.1+

Migrating from Pre-2.1 to 2.1+ may result in different results in some cases due to the addition of fallthrough. While all your Pre-2.1 rules will include the circulate, duration_rule, recurring_fine_rule, and max_fine_rule values they may not contain hard_due_date, total_copy_hold_ratio, and available_copy_hold_ratio. If you are using these values in your Pre-2.1 rules at all then fallthrough may cause them to be applied where you do not want them to be.

There are two quick solutions to this problem:

  1. For total_copy_hold_ratio and available_copy_hold_ratio you can set them to 0 for all matchpoints they are not set in. A value of 0 effectively disables them.
  2. For hard_due_date you can create a dummy hard due date value (Such as "None") with a date in the past (such as 1970-1-31). Hard due dates in the past return to using the duration rule.
evergreen-admin/customization/indb-circ.txt · Last modified: 2022/02/10 13:34 (external edit)

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