Post function : Single select list custom field values setting on WF Transition

[Maha vishnu v]

This is the below code i have used and had no working , Aggregate status is the field name , Design is the values want to set on transition Todo ==> inprogress 

Code 1 tried : 

def cf = customFieldManager.getCustomFieldObjects(issue).find {it.name == 'MyCustomFieldType'}

issue.setCustomFieldValue(cf, 'Design')

compiled without error and its not working

Code 2 tried : 

import com.atlassian.jira.component.ComponentAccessor;
import com.atlassian.jira.ComponentManager;
import com.atlassian.jira.issue.CustomFieldManager;
import com.atlassian.jira.issue.customfields.manager.OptionsManager;
import com.atlassian.jira.issue.customfields.option.Option;
import com.atlassian.jira.issue.fields.CustomField;
import com.atlassian.jira.issue.MutableIssue;
MutableIssue currentissue = currentissue // Any one please explain what is mutable issue ? 
def cf = customFieldManager.getCustomFieldObjects(issue).find {it.name == 'Aggregate status'}
def fieldConfig = cf.getRelevantConfig(issue)
Option value = ComponentAccessor.optionsManager.getOptions(fieldConfig)?.find { it.value == 'Design' }
issue.setCustomFieldValue(cf, value)  

its not working and I need assistance from community  . 

Thanks and i appreciate your information . 

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