dev/core#3503, dev/core#3492 Fix grant exports and relative dates

CRM/Contact/BAO/Query/Hook.php

@@ -65,6 +65,23 @@ public function &getFields() {
     return $extFields;
   }
 
+  /**
+   * Get the fields that are available in the 'contact context'.
+   *
+   * For example exporting contacts should not include fields for grants etc.
+   *
+   * @return array
+   */
+  public function getContactFields(): array {
+    $extFields = [];
+    foreach ($this->getSearchQueryObjects() as $obj) {
+      // Get Fields is ambiguous about the
+      $fields = method_exists($obj, 'getContactFields') ? $obj->getContactFields() : $obj->getFields();
+      $extFields = array_merge($extFields, $fields);
+    }
+    return $extFields;
+  }
+
   /**
    * @param $apiEntities
    * @param $fieldOptions

CRM/Core/BAO/Mapping.php

@@ -611,7 +611,10 @@ public static function getBasicFields($mappingType) {
       else {
         $contactFields = CRM_Contact_BAO_Contact::exportableFields($contactType, FALSE, TRUE);
       }
-      $contactFields = array_merge($contactFields, CRM_Contact_BAO_Query_Hook::singleton()->getFields());
+      // It's unclear when we would want this but.... see
+      // https://lab.civicrm.org/dev/core/-/issues/3069 for when we don't....
+      $contactFields = array_merge($contactFields, CRM_Contact_BAO_Query_Hook::singleton()
+        ->getContactFields());
 
       // Exclude the address options disabled in the Address Settings
       $fields[$contactType] = CRM_Core_BAO_Address::validateAddressOptions($contactFields);

ext/civigrant/CRM/Grant/BAO/Query.php

@@ -17,16 +17,25 @@
 class CRM_Grant_BAO_Query extends CRM_Contact_BAO_Query_Interface {
 
   /**
-   * Unused.
+   * Get available fields.
    *
-   * This function is meant to return extra contact fields, but grants are not contacts.
+   * Important for exports & relative date filters.
    *
    * @return array
    */
   public function &getFields() {
-    $fields = [];
-    return $fields;
-    // return CRM_Grant_BAO_Grant::exportableFields();
+    return CRM_Grant_BAO_Grant::exportableFields();
+  }
+
+  /**
+   * Get the fields that are available in the 'contact context'.
+   *
+   * For example exporting contacts should not include fields for grants etc.
+   *
+   * @return array
+   */
+  public function getContactFields(): array {
+    return [];
   }
 
   /**