6 files changed, 9 insertions, 5 deletions
diff --git a/lib/active_relation/relations.rb b/lib/active_relation/relations.rb
index f992fca8be..7776fd3d18 100644
--- a/lib/active_relation/relations.rb
+++ b/lib/active_relation/relations.rb
@@ -1,5 +1,6 @@
 require 'active_relation/relations/relation'
 require 'active_relation/relations/compound'
+require 'active_relation/relations/writing'
 require 'active_relation/relations/table'
 require 'active_relation/relations/join'
 require 'active_relation/relations/aggregation'
diff --git a/lib/active_relation/relations/compound.rb b/lib/active_relation/relations/compound.rb
index a10b7588e7..fac0939c6f 100644
--- a/lib/active_relation/relations/compound.rb
+++ b/lib/active_relation/relations/compound.rb
@@ -1,5 +1,7 @@
 module ActiveRelation
   class Compound < Relation
+    abstract :==, :descend
+    
     attr_reader :relation
     delegate :joins, :selects, :orders, :groupings, :table_sql, :inserts, :limit,
              :offset, :name, :alias, :aggregation?, :alias?, :prefix_for, :column_for,
diff --git a/lib/active_relation/relations/deletion.rb b/lib/active_relation/relations/deletion.rb
index c5906e8bc8..0fcf523efe 100644
--- a/lib/active_relation/relations/deletion.rb
+++ b/lib/active_relation/relations/deletion.rb
@@ -1,5 +1,5 @@
 module ActiveRelation
-  class Deletion < Compound
+  class Deletion < Writing
     def initialize(relation)
       @relation = relation
     end
diff --git a/lib/active_relation/relations/insertion.rb b/lib/active_relation/relations/insertion.rb
index 036db1a319..ce065b64c1 100644
--- a/lib/active_relation/relations/insertion.rb
+++ b/lib/active_relation/relations/insertion.rb
@@ -1,5 +1,5 @@
 module ActiveRelation
-  class Insertion < Compound
+  class Insertion < Writing
     attr_reader :record
 
     def initialize(relation, record)
diff --git a/lib/active_relation/relations/update.rb b/lib/active_relation/relations/update.rb
index 0914cda035..a51f248866 100644
--- a/lib/active_relation/relations/update.rb
+++ b/lib/active_relation/relations/update.rb
@@ -1,5 +1,5 @@
 module ActiveRelation
-  class Update < Compound
+  class Update < Writing
     attr_reader :assignments
 
     def initialize(relation, assignments)
diff --git a/lib/active_relation/sql.rb b/lib/active_relation/sql.rb
index e5a4eed08b..0d233b307e 100644
--- a/lib/active_relation/sql.rb
+++ b/lib/active_relation/sql.rb
@@ -5,10 +5,11 @@ module ActiveRelation
     end
     
     class Formatter
+      abstract :attribute, :select, :value
+      
       attr_reader :engine
-      include Quoting
       
-      abstract :attribute, :select, :value
+      include Quoting
       
       def initialize(engine)
         @engine = engine