1 files changed, 36 insertions, 0 deletions
diff --git a/lib/arel/algebra/relations/writes.rb b/lib/arel/algebra/relations/writes.rb
new file mode 100644
index 0000000000..d344987915
--- /dev/null
+++ b/lib/arel/algebra/relations/writes.rb
@@ -0,0 +1,36 @@
+module Arel
+  class Deletion < Compound
+    attributes :relation
+    deriving :initialize, :==
+
+    def call
+      engine.delete(self)
+    end
+  end
+
+  class Insert < Compound
+    attributes :relation, :record
+    deriving :==
+
+    def initialize(relation, record)
+      @relation, @record = relation, record.bind(relation)
+    end
+
+    def call
+      engine.create(self)
+    end
+  end
+
+  class Update < Compound
+    attributes :relation, :assignments
+    deriving :==
+
+    def initialize(relation, assignments)
+      @relation, @assignments = relation, assignments.bind(relation)
+    end
+
+    def call
+      engine.update(self)
+    end
+  end
+end