lib/blind_index/extensions.rb in blind_index-0.1.1 vs lib/blind_index/extensions.rb in blind_index-0.2.0

@@ -1,7 +1,8 @@
 module BlindIndex
   module Extensions
+    # ActiveRecord 5.0+
     module TableMetadata
       def resolve_column_aliases(hash)
         new_hash = super
         if has_blind_indexes?
           hash.each do |key, _|
@@ -17,9 +18,34 @@
       def has_blind_indexes?
         unless defined?(@has_blind_indexes)
           @has_blind_indexes = klass.respond_to?(:blind_indexes)
         end
         @has_blind_indexes
+      end
+    end
+
+    # ActiveRecord 4.2
+    module PredicateBuilder
+      def resolve_column_aliases(klass, hash)
+        new_hash = super
+        if has_blind_indexes?(klass)
+          hash.each do |key, _|
+            if (bi = klass.blind_indexes[key])
+              new_hash[bi[:bidx_attribute]] = BlindIndex.generate_bidx(new_hash.delete(key), bi)
+            end
+          end
+        end
+        new_hash
+      end
+
+      @@blind_index_cache = {}
+
+      # memoize for performance
+      def has_blind_indexes?(klass)
+        if @@blind_index_cache[klass].nil?
+          @@blind_index_cache[klass] = klass.respond_to?(:blind_indexes)
+        end
+        @@blind_index_cache[klass]
       end
     end
 
     module UniquenessValidator
       if ActiveRecord::VERSION::STRING >= "5.2"