Support reversed checkbox facet sections in label loading.

config/vufind/EDS.ini

@@ -122,7 +122,9 @@ labelSections[] = Facets
 
 ; This setting lists configuration settings defining checkbox facets. If you use
 ; a custom section to configure additional facets, be sure to add it to this list
-; so labels display correctly in history, the advanced search editor, etc.
+; so labels display correctly in history, the advanced search editor, etc. If you
+; are using the reverse label => filter format rather than filter => label, you
+; should prefix the section name with a ~ character to ensure proper loading.
 checkboxSections[] = CheckboxFacets
 
 ; Facet display settings
@@ -229,14 +231,14 @@ organization_id = "VuFind 2.x from MyUniversity"
 [List]
 view=full
 
-; This section controls the behavior of the Autocomplete of EDS 
+; This section controls the behavior of the Autocomplete of EDS
 ; If enabled the option "autocomplete" is send for UIDAuth to get the token
-; and the url. 
+; and the url.
 [Autocomplete]
 ; Set this to false to disable all autocomplete behavior
 enabled = true
 
-; Define a default_handler 
+; Define a default_handler
 default_handler = Eds
 
 ; Auto-submit autocomplete on click or enter
@@ -247,7 +249,7 @@ auto_submit = true
 ; behavior when that search type is selected. (default: Eds:rawqueries)
 ; These values are available: None, Eds:rawqueries and Eds:holdings
 ; Use None to disable autocomplete for a specific search type
-; Use Eds:holdings for title completion in PubFinder. 
+; Use Eds:holdings for title completion in PubFinder.
 ; Use Eds:rawqueries for completion of basic textual queries.
 [Autocomplete_Types]
 ;AllFields = Eds:rawqueries

config/vufind/Primo.ini

@@ -108,7 +108,9 @@ labelSections[] = Facets
 
 ; This setting lists configuration settings defining checkbox facets. If you use
 ; a custom section to configure additional facets, be sure to add it to this list
-; so labels display correctly in history, the advanced search editor, etc.
+; so labels display correctly in history, the advanced search editor, etc. If you
+; are using the reverse label => filter format rather than filter => label, you
+; should prefix the section name with a ~ character to ensure proper loading.
 checkboxSections[] = CheckboxFacets
 
 ; Checkbox facets are facets, which are getting displayed as checkboxes

config/vufind/Summon.ini

@@ -164,7 +164,9 @@ labelSections[] = Facets
 
 ; This setting lists configuration settings defining checkbox facets. If you use
 ; a custom section to configure additional facets, be sure to add it to this list
-; so labels display correctly in history, the advanced search editor, etc.
+; so labels display correctly in history, the advanced search editor, etc. If you
+; are using the reverse label => filter format rather than filter => label, you
+; should prefix the section name with a ~ character to ensure proper loading.
 checkboxSections[] = CheckboxFacets
 
 ; Facet display settings

config/vufind/facets.ini

@@ -39,7 +39,9 @@ labelSections[] = ExtraFacetLabels
 
 ; This setting lists configuration settings defining checkbox facets. If you use
 ; a custom section to configure additional facets, be sure to add it to this list
-; so labels display correctly in history, the advanced search editor, etc.
+; so labels display correctly in history, the advanced search editor, etc. If you
+; are using the reverse label => filter format rather than filter => label, you
+; should prefix the section name with a ~ character to ensure proper loading.
 checkboxSections[] = CheckboxFacets
 
 ; This section is used to specify labels for facets that may be applied by parts

module/VuFind/src/VuFind/Search/Base/Params.php

@@ -1797,11 +1797,19 @@ class Params
     ) {
         $config = $this->configLoader
             ->get($cfgFile ?? $this->getOptions()->getFacetsIni());
-        if (empty($config->$facetList)) {
-            return false;
-        }
-        foreach ($config->$facetList as $key => $value) {
-            $this->addCheckboxFacet($key, $value);
+        $retVal = false;
+        // If the section is in reverse order, the tilde will flag this:
+        if (substr($facetList, 0, 1) == '~') {
+            foreach ($config->{substr($facetList, 1)} as $value => $key) {
+                $this->addCheckboxFacet($key, $value);
+                $retVal = true;
+            }
+        } else {
+            foreach ($config->$facetList as $key => $value) {
+                $this->addCheckboxFacet($key, $value);
+                $retVal = true;
+            }
         }
+        return $retVal;
     }
 }