1 files changed, 23 insertions, 3 deletions
diff --git a/activerecord/lib/active_record/associations/association_scope.rb b/activerecord/lib/active_record/associations/association_scope.rb
index 0209ce36df..2972b7e13e 100644
--- a/activerecord/lib/active_record/associations/association_scope.rb
+++ b/activerecord/lib/active_record/associations/association_scope.rb
@@ -10,7 +10,7 @@ module ActiveRecord
 
       def initialize(association)
         @association   = association
-        @alias_tracker = AliasTracker.new
+        @alias_tracker = AliasTracker.new klass.connection
       end
 
       def scope
@@ -33,6 +33,23 @@ module ActiveRecord
 
       private
 
+      def column_for(table_name, column_name)
+        columns = alias_tracker.connection.schema_cache.columns_hash[table_name]
+        columns[column_name]
+      end
+
+      def bind_value(scope, column, value)
+        substitute = alias_tracker.connection.substitute_at(
+          column, scope.bind_values.length)
+        scope.bind_values += [[column, value]]
+        substitute
+      end
+
+      def bind(scope, table_name, column_name, value)
+        column   = column_for table_name, column_name
+        bind_value scope, column, value
+      end
+
       def add_constraints(scope)
         tables = construct_tables
 
@@ -67,10 +84,13 @@ module ActiveRecord
           conditions = self.conditions[i]
 
           if reflection == chain.last
-            scope = scope.where(table[key].eq(owner[foreign_key]))
+            bind_val = bind scope, table.table_name, key.to_s, owner[foreign_key]
+            scope    = scope.where(table[key].eq(bind_val))
 
             if reflection.type
-              scope = scope.where(table[reflection.type].eq(owner.class.base_class.name))
+              value    = owner.class.base_class.name
+              bind_val = bind scope, table.table_name, reflection.type.to_s, value
+              scope    = scope.where(table[reflection.type].eq(bind_val))
             end
 
             conditions.each do |condition|