Add dsl for outcome schemas (tables) for roqua

lib/quby/compiler/outputs/roqua_serializer.rb

@@ -21,7 +21,7 @@ module Quby
             respondent_types: questionnaire.respondent_types,
             tags: questionnaire.tags.to_h.keys,
             charts: charts,
-            outcome_schema: outcome_schema,
+            outcome_tables_schema: outcome_tables_schema,
           }
         end
 
@@ -75,9 +75,17 @@ module Quby
           }
         end
 
-        def outcome_schema
+        # configuration for outcome tables.
+        # tables:
+        #   <outcome_table_name:Symbol>: # each entry is a table.
+        #     score_keys: Set[<schema.key:Symbol>] # rows in the table
+        #     subscore_keys: Set[<subschema.key:Symbol>] # columns  in the table
+        # headers:
+        #   <subscore_key:Symbol>: <subscore.label:String> # headers for each subscore key for all tables.
+
+        def outcome_tables_schema
           # hash of tables, with the score keys (rows) and subscore keys (columns) used for each
-          tables = Hash.new{ |hash, key| hash[key] = {score_keys: [], subscore_keys: []} }
+          tables = Hash.new{ |hash, key| hash[key] = {score_keys: Set.new, subscore_keys: Set.new } }
           # hash of `subscore_key: subscore_label` pairs used in tables
           headers = {}
           
@@ -89,12 +97,9 @@ module Quby
             end
           end
           
-          tables.values.each { |table| table[:score_keys].uniq! }
-          tables.values.each { |table| table[:subscore_keys].uniq! }
-          
           {
             headers: headers,
-            tables: tables.values,
+            tables: tables,
           }
         end
       end