Help with a subtracting a number from a scripted field

Scott Federman_r83gv8

I currently have a (script-runner) scripted field in an "Order Request" called "Total Order Expense($)" which calculates the sum of all linked "line item orders".  

I have added an RMA issue type which is also linked to the "Order Request" which is how we track returned items. This has a calculated field called "Return Amount" which needs to be subtracted from the "Total Order Expense ($) field in the order request. 

Below is the script i use to calculate the "Total Order Expense ($) now. How would I include the ability to subtract the "Return Amount" from that number?

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

def csExpense = ComponentAccessor.getCustomFieldManager().getCustomFieldObjectByName("Expense")
return issue.getSubTaskObjects().sum{it ->((Issue) it).getCustomFieldValue(csExpense)};

Brittany Wispell

Hey @Scott Federman

Here are some examples of multiplying, adding, subtracting and dividing using groovy. 

You'll need to define each custom field you need. See below example. Let me know if it helps. 

def customfieldnameCF = ComponentAccessor.customFieldManager.getCustomFieldObjectByName("Custom Field Name")
def customfieldvalueCFVal = issue.getCustomFieldValue(customfieldnameCF) as Double

def calc = ((customfieldvalueCFVal*3) - customfieldvalueCFVal + customfieldvalueCFVal)/8

def calcc = customfieldvalue1CFVal - customfieldvalue2CFVal - customfieldvalue3CFVal