Added Solr id prefix setting to NoILS driver.

- This applies when NoILS is used in combo with MultiBackend.

config/vufind/NoILS.ini

@@ -14,6 +14,11 @@ useHoldings = none
 ; marc = Use information in the Marc Record Mapped from [MarcStatus]
 ; custom = use the options in the [Status] section below
 useStatus = none
+;idPrefix - Optional - Prefix added to Solr record IDs managed by this instance of
+; the NoILS driver; needed when using this driver in combination with the
+; MultiBackend driver. When used, the value should usually match one of the keys
+; in the [Drivers] section of MultiBackend.ini followed by a dot.
+;idPrefix = "instance1."
 
 [MarcHoldings]
 ; Used if useHoldings is set to "marc"

module/VuFind/src/VuFind/ILS/Driver/NoILS.php

@@ -91,6 +91,17 @@ class NoILS extends AbstractBase implements TranslatorAwareInterface
         return isset($this->config[$function]) ? $this->config[$function] : false;
     }
 
+    /**
+     * Get the ID prefix from the configuration, if set.
+     *
+     * @return string
+     */
+    protected function getIdPrefix()
+    {
+        return isset($this->config['settings']['idPrefix'])
+            ? $this->config['settings']['idPrefix'] : null;
+    }
+
     /**
      * Get a Solr record.
      *
@@ -100,7 +111,9 @@ class NoILS extends AbstractBase implements TranslatorAwareInterface
      */
     protected function getSolrRecord($id)
     {
-        return $this->recordLoader->load($id);
+        // Add idPrefix condition
+        $idPrefix = $this->getIdPrefix();
+        return $this->recordLoader->load(strlen($idPrefix) ? $idPrefix . $id : $id);
     }
 
     /**
@@ -246,6 +259,13 @@ class NoILS extends AbstractBase implements TranslatorAwareInterface
             $result = $recordDriver->tryMethod(
                 'getFormattedMarcDetails', [$field, $marcStatus]
             );
+            // If the details coming back from the record driver include the
+            // ID prefix, strip it off!
+            $idPrefix = $this->getIdPrefix();
+            if (isset($result[0]['id']) && strlen($idPrefix)
+                && $idPrefix === substr($result[0]['id'], 0, strlen($idPrefix))) {
+                $result[0]['id'] = substr($result[0]['id'], strlen($idPrefix));
+            }
             return empty($result) ? [] : $result;
         }
         return [];