Refactor to calculations. Migration's versions are string not integer. ARel submodule updated.

activerecord/lib/active_record/calculations.rb

@@ -170,12 +170,12 @@ module ActiveRecord
           elsif !options[:select].blank?
             column_name = options[:select]
           end
-          construct_calculation_arel(options.merge(:select =>  Arel::Attribute.new(Arel(table), column_name).count(options[:distinct]))).select_value
+          construct_calculation_arel(options.merge(:select =>  Arel::Attribute.new(Arel(table), column_name).count(options[:distinct])))
         else
-          construct_calculation_arel(options.merge(:select =>  Arel::Attribute.new(Arel(table), column_name).send(operation))).select_value
+          construct_calculation_arel(options.merge(:select =>  Arel::Attribute.new(Arel(table), column_name).send(operation)))
         end
 
-        type_cast_calculated_value(value, column_for(column_name), operation)
+        type_cast_calculated_value(connection.select_value(value.to_sql), column_for(column_name), operation)
       end
 
       def execute_grouped_calculation(operation, column_name, options) #:nodoc:
@@ -190,12 +190,11 @@ module ActiveRecord
 
         aggregate_alias = column_alias_for(operation, column_name)
 
-        if operation == 'count' && column_name == :all
-          options[:select] = "COUNT(*) AS count_all, #{group_field} AS #{group_alias}"
-        else
-          arel_column = Arel::Attribute.new(arel_table, column_name).send(operation)
-          options[:select] = "#{arel_column.as(aggregate_alias).to_sql}, #{group_field} AS #{group_alias}"
-        end
+        options[:select] = (operation == 'count' && column_name == :all) ?
+          "COUNT(*) AS count_all" :
+          Arel::Attribute.new(arel_table, column_name).send(operation).as(aggregate_alias).to_sql
+
+        options[:select] <<  ", #{group_field} AS #{group_alias}"
 
         calculated_data = connection.select_all(construct_calculation_arel(options).to_sql)
 

activerecord/lib/active_record/migration.rb

@@ -410,7 +410,7 @@ module ActiveRecord
 
       def get_all_versions
         table = Arel(schema_migrations_table_name)
-        table.project(table['version']).select_values.map(&:to_i).sort
+        Base.connection.select_values(table.project(table['version']).to_sql).map(&:to_i).sort
       end
 
       def current_version
@@ -535,11 +535,11 @@ module ActiveRecord
 
         @migrated_versions ||= []
         if down?
-          @migrated_versions.delete(version.to_i)
-          table.where(table["version"].eq(version)).delete
+          @migrated_versions.delete(version)
+          table.where(table["version"].eq(version.to_s)).delete
         else
-          @migrated_versions.push(version.to_i).sort!
-          table.insert table["version"] => version
+          @migrated_versions.push(version).sort!
+          table.insert table["version"] => version.to_s
         end
       end
 

arel

@@ -1 +1 @@
-Subproject commit de843c86518e4ac871d4bb5b0873bb6c184ac304
+Subproject commit a7dea38204f3c40e4d0c3f29ebe17af818659697