1 files changed, 30 insertions, 9 deletions
diff --git a/activerecord/lib/active_record/associations/association_scope.rb b/activerecord/lib/active_record/associations/association_scope.rb
index 982084c9b8..5a44d3a156 100644
--- a/activerecord/lib/active_record/associations/association_scope.rb
+++ b/activerecord/lib/active_record/associations/association_scope.rb
@@ -15,24 +15,42 @@ module ActiveRecord
 
       def scope
         scope = klass.unscoped
-        scope = scope.extending(*Array(options[:extend]))
+
+        scope.extending!(*Array(options[:extend]))
 
         # It's okay to just apply all these like this. The options will only be present if the
         # association supports that option; this is enforced by the association builder.
-        scope = scope.apply_finder_options(options.slice(
-          :readonly, :include, :references, :order, :limit, :joins, :group, :having, :offset, :select))
+        scope.merge!(options.slice(
+          :readonly, :references, :order, :limit, :joins, :group, :having, :offset, :select, :uniq))
 
-        if options[:through] && !options[:include]
-          scope = scope.includes(source_options[:include])
+        if options[:include]
+          scope.includes! options[:include]
+        elsif options[:through]
+          scope.includes! source_options[:include]
         end
 
-        scope = scope.uniq if options[:uniq]
-
         add_constraints(scope)
       end
 
       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 +85,13 @@ 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|