How to render p:selectOneMenu inside an editable p:dataTable - jsf-2

Question

I would like to render p:selectOneMenu inside p:dataTable upon rowEditInit event. I tried update="degreeType", update=formid:editTable:degreeType but it didn't work. update="#this is not a option as it refreshes whole table and clears the edit selection. As it is a dataTable, the exact id for the element is formid:editTable:0:degreeType, 0 being row number. How should I get the current row id number and put in update field?
<p:dataTable id="editTable" value="#{bean.emp}" var="stud" disabledSelection="true" editable="true" >
<p:ajax event="rowEditInit" listener="#{bean.onRowInit}" update="degreeType"/>
<p:ajax event="rowEdit" listener="#{bean.onRowEdit}" />
<p:ajax event="rowEditCancel" listener="#{bean.onRowCancel}" />
<!-- a bunch of p:column tags -->
<p:column headerText="Degree">
<p:cellEditor>
<f:facet name="output"><h:outputText value="#{stud.degree}" /></f:facet>
<f:facet name="input">
<p:selectOneMenu value="#{stud.degree}" style="width: 100%" >
<f:ajax event="change" listener="#{bean.degreeListener}" render="degreeType" />
<f:selectItem itemLabel="Select One" itemValue=""/>
<f:selectItem itemLabel="MS" itemValue="MS"/>
<f:selectItem itemLabel="BS" itemValue="BS"/>
</p:selectOneMenu>
</f:facet>
</p:cellEditor>
</p:column>
<p:column headerText="DegreeType">
<p:cellEditor id="test">
<f:facet name="output"><h:outputText value="#{stud.degreeType}" /></f:facet>
<f:facet name="input">
<p:selectOneMenu id="degreeType" value="#{stud.degreeType}" rendered="true">
<f:selectItem itemLabel="Select One" itemValue="" noSelectionOption="true"/>
<f:selectItems value="#{stud.degreeTypes}"/>
</p:selectOneMenu>
</f:facet>
</p:cellEditor>
</p:column>
<p:column style="width: 30px">
<p:rowEditor />
</p:column>
</p:dataTable>