+// Store the summed story points on the Story Points field of the epic issue

+// Get the Epic Issue Key

+// Sum the storyPoints

+logger.info("Summed Story Points: ${estimate}")

+// Store the summed story points on the Story Points field of the parent issue

+// Now update the Epic issue

+// check that updating the Epic issue worked

+ * This script listiner which should be configured on the issue updated event and shows how you can update the value of the story points field on the epic to show a sum of the values from the story points field for all stories linked to the epic, each time the epic issue is updated.

+ * This script listiner which should be configured on the issue updated event shows how you can update the value of the story points field on the epic to show a sum of the values from the story points field for all stories linked to the epic, each time the epic issue is updated.

+ * "All right, title and interest in this code snippet shall remain the exclusive intellectual property of Adaptavist Group Ltd and its affiliates. Customers with a valid ScriptRunner 

+ * license shall be granted a  non-exclusive, non-transferable, freely revocable right to use this code snippet only within their own instance of Atlassian products. This licensing notice cannot be removed

+ * or amended and must be included in any circumstances where the code snippet is shared by You or a third party." 

+ */

+

+if(issue.fields.issuetype.name.toString() == "Epic"){

+    

+// Retrieve all the subtasks of this issue's parent

+def epicIssueKey = issue.key.toString()

+logger.info("Epic Key = " + epicIssueKey)

+

+// Get the field ids

+def fields = get('/rest/api/2/field')

+        .asObject(List)

+        .body as List<Map>

+

+// Get the story points custom field to use in the script

+def storyPointsField =  fields.find { it.name == "Story Points" }.id

+logger.info("The id of the story points field is: $storyPointsField")

+

+// Note:  The search API is limited that to only be able to return a maximum of 50 results

+def allStories = get("/rest/api/2/search")

+        .queryString("jql", "parentEpic =${epicIssueKey} and issuetype = 'Story'")

+        .queryString("fields", "parent,$storyPointsField") 

+        .asObject(Map)

+        .body

+        .issues as List<Map>

+

+logger.info("Total stories for ${epicIssueKey}: ${allStories.size()}")

+

+// Sum the estimates

+def estimate = allStories.collect { Map story ->

+    story.fields[storyPointsField] ?: 0  

+

+}.sum()

+logger.info("Summed estimate: ${estimate}")

+

+// Store the summed estimate on the Story Points field of the parent issue

+def summedEstimateField = fields.find { it.name == "Story Points" }.id

+

+logger.info("Custom field ID to update: ${summedEstimateField}")

+

+// Now update the parent issue

+def result = put("/rest/api/2/issue/${epicIssueKey}")

+        .header('Content-Type', 'application/json')

+        .body([

+        fields: [

+                (summedEstimateField): estimate

+        ]

+])

+        .asString()

+

+// check that updating the parent issue worked

+assert result.status >= 200 && result.status < 300

+    

+}else{

+    logger.info("Not an Epic issue so do nothing")