Stored procedure mapping for many-to-many association - sql-server

Question

I have a relatively simple table of Terms, and each Term can have multiple parents and children so there is a TermAssociation table.
Term TermAssociation
---- ---------------
TermID ParentTermID
TermName ChildTermID
...
When mapped in EF, this generates a Term entity with a many-to-many association with itself. Everything's cool.
The problem is I work in an environment where all table updates must go through stored procedures. I can use stored procedure mapping just fine for the Term entity, but how do I map an SP to the TermAssociation table since it's modeled as an association and not an entity?

Answer 1

I haven't found a way to do this through the designer, but it is possible if you edit the XML of the edmx file directly. Find the association set mapping:
<AssociationSetMapping Name="TermAssociation" TypeName="TCPDataDictionaryModel.TermAssociation" StoreEntitySet="TermAssociation">
<EndProperty Name="Term">
<ScalarProperty Name="TermId" ColumnName="ParentTermId" />
</EndProperty>
<EndProperty Name="Term1">
<ScalarProperty Name="TermId" ColumnName="ChildTermId" />
</EndProperty>
</AssociationSetMapping>
Then add a ModificationFunctionMapping inside the AssociationSetMapping. InsertAssociation is my insert SP and it takes #ParentTermId and #ChildTermId as parameters.
<ModificationFunctionMapping>
<InsertFunction FunctionName="TCPDataDictionaryModel.Store.InsertAssociation" >
<EndProperty Name="Term">
<ScalarProperty Name="TermId" ParameterName="ParentTermId" />
</EndProperty>
<EndProperty Name="Term1">
<ScalarProperty Name="TermId" ParameterName="ChildTermId" />
</EndProperty>
</InsertFunction>
</ModificationFunctionMapping>