Calculate the Sum of Fields from Multiple Issues from a JQL Query

    

        
        
        
            
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    import com.atlassian.jira.component.ComponentAccessor
import com.atlassian.jira.issue.Issue

// sum up the values of this custom field
final customFieldName = 'Amount Paid'

def subtasks = issue.subTaskObjects

// if the issue doesn't have any sub-tasks or is a subtask itself then no need for action
if (!subtasks) {
    return
}

def firstSubtask = subtasks.first()
def customField_ = ComponentAccessor.customFieldManager.getCustomFieldObjects(firstSubtask).findByName(customFieldName)
if (!customField_) {
    log.info "Custom field with name $customFieldName is not configured for issue type $firstSubtask.issueType.name and project $firstSubtask.projectObject.key"
    return null
}

subtasks.sum { Issue it -> it.getCustomFieldValue(customField_) ?: 0 }