Possibly improve using different database connections

lib/ransack/adapters/active_record/context.rb

@@ -22,12 +22,13 @@ module Ransack
 
         def type_for(attr)
           return nil unless attr && attr.valid?
-          name    = attr.arel_attribute.name.to_s
-          table   = attr.arel_attribute.relation.table_name
-
-          schema_cache = @engine.connection.schema_cache
-          raise "No table named #{table} exists" unless schema_cache.table_exists?(table)
-          schema_cache.columns_hash(table)[name].type
+          name        = attr.arel_attribute.name.to_s
+          table       = attr.arel_attribute.relation.table_name
+          connection  = attr.klass.connection
+          unless connection.table_exists?(table)
+            raise "No table named #{table} exists"
+          end
+          connection.schema_cache.columns_hash(table)[name].type
         end
 
         def evaluate(search, opts = {})