How to increment number field via post function?

[Andreas P]

Is it possible to increment a custom number field in a post function?
I tried it with Update Any Issue Field (JSU) function, but it only let's me set it to one specific value, but not to currentValue+1.

[Joffrey_Hamman]

An example of scriped postfunction to increment a custom number field:

import com.atlassian.jira.ComponentAccessor
import com.atlassian.jira.component.ComponentAccessor
import com.atlassian.jira.issue.Issue
import com.atlassian.jira.issue.MutableIssue
import com.atlassian.jira.issue.customfields.CustomFieldType
import com.atlassian.jira.issue.CustomFieldManager
import com.atlassian.jira.issue.fields.CustomField
import com.atlassian.jira.issue.ModifiedValue
import com.atlassian.jira.issue.util.DefaultIssueChangeHolder
import com.atlassian.jira.issue.util.IssueChangeHolder
import com.atlassian.jira.issue.IssueManager
CustomFieldManager cfManager = ComponentAccessor.getCustomFieldManager()
IssueManager issueManager = ComponentAccessor.getIssueManager()

// In "customfield_15201" replace 15201 by the ID of your custom number field
CustomField cf = cfManager.getCustomFieldObject("customfield_15201")
Double val = issue.getCustomFieldValue(cf) as Double

if (val)
val = val + 1
else
val = 1
issue.setCustomFieldValue(cf, val)

[David Fischer]

Hi Andréas,

JMWE has a specific post-function for that, but you can also achieve the same with other apps such as ScriptRunner and a little code for example.