CIVICRM-152 For a repeating Event series. If change the Price Set for…

CRM/Core/BAO/RecurringEntity.php

@@ -126,6 +126,11 @@ class CRM_Core_BAO_RecurringEntity extends CRM_Core_DAO_RecurringEntity {
       ),
     );
 
+  //Define global CLASS CONSTANTS for recurring entity mode types
+  const MODE_THIS_ENTITY_ONLY = 1;
+  const MODE_NEXT_ALL_ENTITY = 2;
+  const MODE_ALL_ENTITY_IN_SERIES = 3;
+
   /**
    * Getter for status.
    *

CRM/Core/Page/AJAX/RecurringEntity.php

@@ -37,6 +37,25 @@ public static function updateMode() {
       if ($dao->find(TRUE)) {
         $dao->mode = $mode;
         $dao->save();
+
+        //CRM-20787 Fix
+        //I am not sure about other fields, if mode = 3 apply for an event then other fields
+        //should be save for all other series events or not so applying for price set only for now here.
+        if (CRM_Core_BAO_RecurringEntity::MODE_ALL_ENTITY_IN_SERIES === $mode) {
+            //Step-1: Get Price set for parent event
+            $currentEventPriceSet = CRM_Price_BAO_PriceSet::getPriceSetOfEntity($entityTable, $entityId);
+
+            //Step-2: Get all events of series
+            $seriesEventRecords = CRM_Core_BAO_RecurringEntity::getEntitiesFor($entityId, $entityTable);
+            foreach($seriesEventRecords as $event) {
+                //Step-3: Save price set in other series events
+                if (CRM_Price_BAO_PriceSet::removeFrom($event['table'], $event['id'])) { //Remove existing priceset
+                    CRM_Core_BAO_Discount::del($event['id'], $event['table']);
+                    CRM_Price_BAO_PriceSet::addTo($event['table'], $event['id'], $currentEventPriceSet['price_set_id']); //Add new price set
+                }
+            }
+        }
+        //CRM-20787 - Fix end
         $finalResult['status'] = 'Done';
       }
       else {

CRM/Price/BAO/PriceSet.php

@@ -273,6 +273,25 @@ public static function addTo($entityTable, $entityId, $priceSetId) {
     return $dao->save();
   }
 
+  /**
+    * Get price set for the given entity and id.
+    *
+    * @param string $entityTable
+    * @param int $entityId
+    *
+    * @return mixed
+    */
+  public static function getPriceSetOfEntity($entityTable, $entityId) {
+      $dao = new CRM_Price_DAO_PriceSetEntity();
+      $dao->entity_id = $entityId;
+      $dao->entity_table = $entityTable;
+      if ($dao->find(TRUE)) {
+          $entities['table'] = $dao->entity_table;
+          $entities['id'] = $dao->entity_id;
+          $entities['price_set_id'] = $dao->price_set_id;
+      }
+      return $entities;
+  }
   /**
    * Delete price set for the given entity and id.
    *