diff --git a/lib/arel/engines/sql/compilers/postgresql_compiler.rb b/lib/arel/engines/sql/compilers/postgresql_compiler.rb
index 3f814255..250d5825 100644
--- a/lib/arel/engines/sql/compilers/postgresql_compiler.rb
+++ b/lib/arel/engines/sql/compilers/postgresql_compiler.rb
@@ -3,7 +3,7 @@ module SqlCompiler
     class PostgreSQLCompiler < GenericCompiler
 
       def select_sql
-        if !orders.blank? && using_distinct_on?
+        if !relation.orders.blank? && using_distinct_on?
           subquery = build_query \
             "SELECT #{select_clauses.kind_of?(::Array) ? select_clauses.join("") : select_clauses.to_s}",
             "FROM #{from_clauses}",
@@ -24,7 +24,7 @@ def select_sql
       end
 
       def using_distinct_on?
-        select_clauses.any? { |x| x =~ /DISTINCT ON/ }
+        relation.select_clauses.any? { |x| x =~ /DISTINCT ON/ }
       end
 
       def aliased_orders(orders)
diff --git a/lib/arel/engines/sql/relations/compiler.rb b/lib/arel/engines/sql/relations/compiler.rb
index 9691c851..2fb4c784 100644
--- a/lib/arel/engines/sql/relations/compiler.rb
+++ b/lib/arel/engines/sql/relations/compiler.rb
@@ -1,17 +1,21 @@
 module Arel
   module SqlCompiler
     class GenericCompiler
-      attr_reader :relation
+      attr_reader :relation, :engine
 
       def initialize(relation)
         @relation = relation
         @engine = relation.engine
       end
 
+      def christener
+        relation.christener
+      end
+
       def select_sql
         if relation.projections.first.is_a?(Count) && relation.projections.size == 1 &&
-          (taken.present? || wheres.present?) && joins(self).blank?
-          subquery = build_query("SELECT 1 FROM #{from_clauses}", build_clauses)
+          (relation.taken.present? || relation.wheres.present?) && relation.joins(self).blank?
+          subquery = build_query("SELECT 1 FROM #{relation.from_clauses}", build_clauses)
           query = "SELECT COUNT(*) AS count_id FROM (#{subquery}) AS subquery"
         else
           query = [
@@ -24,7 +28,7 @@ def select_sql
       end
 
       def build_clauses
-        joins   = joins(self)
+        joins   = relation.joins(self)
         wheres  = relation.where_clauses
         groups  = relation.group_clauses
         havings = relation.having_clauses
@@ -50,9 +54,9 @@ def build_clauses
       def delete_sql
         build_query \
           "DELETE",
-          "FROM #{table_sql}",
-          ("WHERE #{wheres.collect(&:to_sql).join(' AND ')}" unless wheres.blank? ),
-          (add_limit_on_delete(taken)                        unless taken.blank?  )
+          "FROM #{relation.table_sql}",
+          ("WHERE #{relation.wheres.collect { |x| x.to_sql }.join(' AND ')}" unless relation.wheres.blank? ),
+          (add_limit_on_delete(relation.taken)                        unless relation.taken.blank?  )
       end
 
       def add_limit_on_delete(taken)
@@ -60,19 +64,19 @@ def add_limit_on_delete(taken)
       end
 
       def insert_sql(include_returning = true)
-        insertion_attributes_values_sql = if record.is_a?(Value)
-          record.value
+        insertion_attributes_values_sql = if relation.record.is_a?(Value)
+          relation.record.value
         else
-          attributes = record.keys.sort_by do |attribute|
+          attributes = relation.record.keys.sort_by do |attribute|
             attribute.name.to_s
           end
 
           first = attributes.collect do |key|
-            engine.connection.quote_column_name(key.name)
+            @engine.connection.quote_column_name(key.name)
           end.join(', ')
 
           second = attributes.collect do |key|
-            key.format(record[key])
+            key.format(relation.record[key])
           end.join(', ')
 
           build_query "(#{first})", "VALUES (#{second})"
@@ -80,9 +84,9 @@ def insert_sql(include_returning = true)
 
         build_query \
           "INSERT",
-          "INTO #{table_sql}",
+          "INTO #{relation.table_sql}",
           insertion_attributes_values_sql,
-          ("RETURNING #{engine.connection.quote_column_name(primary_key)}" if include_returning && compiler.supports_insert_with_returning?)
+          ("RETURNING #{engine.connection.quote_column_name(primary_key)}" if include_returning && relation.compiler.supports_insert_with_returning?)
       end
 
       def supports_insert_with_returning?
@@ -91,18 +95,15 @@ def supports_insert_with_returning?
 
       def update_sql
         build_query \
-          "UPDATE #{table_sql} SET",
+          "UPDATE #{relation.table_sql} SET",
           assignment_sql,
           build_update_conditions_sql
       end
 
-    protected
-      def method_missing(method, *args)
-        if block_given?
-          relation.send(method, *args)  { |*block_args| yield(*block_args) }
-        else
-          relation.send(method, *args)
-        end
+      protected
+
+      def locked
+        relation.locked
       end
 
       def build_query(*parts)
@@ -110,25 +111,26 @@ def build_query(*parts)
       end
 
       def assignment_sql
-        if assignments.respond_to?(:collect)
-          attributes = assignments.keys.sort_by do |attribute|
+        if relation.assignments.respond_to?(:collect)
+          attributes = relation.assignments.keys.sort_by do |attribute|
             attribute.name.to_s
           end
 
           attributes.map do |attribute|
-            value = assignments[attribute]
-            "#{engine.connection.quote_column_name(attribute.name)} = #{attribute.format(value)}"
+            value = relation.assignments[attribute]
+            "#{@engine.connection.quote_column_name(attribute.name)} = #{attribute.format(value)}"
           end.join(", ")
         else
-          assignments.value
+          relation.assignments.value
         end
       end
 
       def build_update_conditions_sql
         conditions = ""
-        conditions << " WHERE #{wheres.collect(&:to_sql).join(' AND ')}" unless wheres.blank?
-        conditions << " ORDER BY #{order_clauses.join(', ')}" unless orders.blank?
+        conditions << " WHERE #{relation.wheres.map { |x| x.to_sql }.join(' AND ')}" unless relation.wheres.blank?
+        conditions << " ORDER BY #{relation.order_clauses.join(', ')}" unless relation.orders.blank?
 
+        taken = relation.taken
         unless taken.blank?
           conditions = limited_update_conditions(conditions, taken)
         end
@@ -138,8 +140,8 @@ def build_update_conditions_sql
 
       def limited_update_conditions(conditions, taken)
         conditions << " LIMIT #{taken}"
-        quoted_primary_key = engine.connection.quote_column_name(primary_key)
-        "WHERE #{quoted_primary_key} IN (SELECT #{quoted_primary_key} FROM #{engine.connection.quote_table_name table.name} #{conditions})"
+        quoted_primary_key = @engine.connection.quote_column_name(relation.primary_key)
+        "WHERE #{quoted_primary_key} IN (SELECT #{quoted_primary_key} FROM #{@engine.connection.quote_table_name relation.table.name} #{conditions})"
       end
 
     end