fix role filtering on contributors browse table

server/app/graphql/types/browse_tables/browse_user_type.rb

@@ -2,7 +2,6 @@ module Types::BrowseTables
   class BrowseUserType < Types::Entities::UserType
     connection_type_class(Types::Connections::BrowseTableConnection)
 
-    @@role_mapping = User.roles.invert
     @@area_mapping = User.area_of_expertises.invert
 
     field :revision_count, Int, null: false
@@ -12,10 +11,6 @@ def area_of_expertise
       @@area_mapping[object.area_of_expertise]
     end
 
-    def role
-      @@role_mapping[object.role]
-    end
-
     def organizations
       Loaders::AssociationLoader.for(MaterializedViews::UserBrowseTableRow, :affiliations).load(object).then do |affil|
         affil.map do |a|

server/app/models/materialized_views/user_browse_table_row.rb

@@ -1,4 +1,6 @@
 class MaterializedViews::UserBrowseTableRow < MaterializedViews::MaterializedView
   has_many :affiliations, primary_key: :id, foreign_key: :user_id
   has_many :organizations, through: :affiliations
+
+  enum role: ['curator', 'editor', 'admin']
 end