Change the Value of a Custom field in a Post Function

    

        
        
        
            
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    import com.atlassian.jira.component.ComponentAccessor

// Name of the custom field to change
final customFieldName = "TextFieldA"

// New value for that field
final newValue = "I love Groovy !"

def customFieldManager = ComponentAccessor.customFieldManager
def customField = customFieldManager.getCustomFieldObjects(issue).find { it.name == customFieldName }

assert customField: "Could not find custom field with name $customFieldName"

issue.setCustomFieldValue(customField, newValue)