@table_columns is a Hash, not an Array

Author: koppen

lib/active_record/connection_adapters/sqlserver_adapter.rb

@@ -744,7 +744,7 @@ def get_table_name(sql)
         end
 
         def identity_column(table_name)
-          @table_columns = {} unless @table_columns
+          @table_columns ||= {}
           @table_columns[table_name] = columns(table_name) if @table_columns[table_name] == nil
           @table_columns[table_name].each do |col|
             return col.name if col.identity
@@ -790,7 +790,7 @@ def repair_special_columns(sql)
 
         def get_utf8_columns(table_name)
           utf8 = []
-          @table_columns ||= []
+          @table_columns ||= {}
           @table_columns[table_name] ||= columns(table_name)
           @table_columns[table_name].each do |col|
             utf8 << col.name if col.is_utf8