lib/proforma/compiling/aggregation.rb in proforma-1.0.0.pre.alpha vs lib/proforma/compiling/aggregation.rb in proforma-1.0.0

@@ -17,10 +17,12 @@
         raise ArgumentError, 'evaluator is required' unless evaluator
 
         @aggregators  = Array(aggregators)
         @counters     = {}
         @evaluator    = evaluator
+
+        freeze
       end
 
       def add(records)
         records.each do |record|
           aggregators.each do |aggregator|
@@ -33,10 +35,10 @@
         end
 
         self
       end
 
-      def to_hash
+      def to_h
         aggregators.map { |aggregator| execute(aggregator) }.to_h
       end
 
       private