adding first node

5 files changed, 37 insertions, 3 deletions

diff --git a/lib/arel.rb b/lib/arel.rb
index afab11cd91..b322e930be 100644
--- a/lib/arel.rb
+++ b/lib/arel.rb
@@ -1,6 +1,7 @@
 require 'arel/version'
 require 'arel/table'
 require 'arel/attributes'
+require 'arel/nodes'
 
 # below is deprecated
 require 'arel/sql/engine'
diff --git a/lib/arel/attributes/attribute.rb b/lib/arel/attributes/attribute.rb
index b83a32bee7..fdc64d62e0 100644
--- a/lib/arel/attributes/attribute.rb
+++ b/lib/arel/attributes/attribute.rb
@@ -1,13 +1,16 @@
 module Arel
   module Attributes
     class Attribute < Struct.new :relation, :name, :column
+      def eq other
+        Nodes::Equality.new self, other
+      end
     end
 
-    class String < Attribute; end
-    class Time < Attribute; end
+    class String  < Attribute; end
+    class Time    < Attribute; end
     class Boolean < Attribute; end
     class Decimal < Attribute; end
-    class Float < Attribute; end
+    class Float   < Attribute; end
     class Integer < Attribute; end
   end
 end
diff --git a/lib/arel/nodes.rb b/lib/arel/nodes.rb
new file mode 100644
index 0000000000..855d8cf236
--- /dev/null
+++ b/lib/arel/nodes.rb
@@ -0,0 +1 @@
+require 'arel/nodes/equality'
diff --git a/lib/arel/nodes/equality.rb b/lib/arel/nodes/equality.rb
new file mode 100644
index 0000000000..11383b1d89
--- /dev/null
+++ b/lib/arel/nodes/equality.rb
@@ -0,0 +1,12 @@
+module Arel
+  module Nodes
+    class Equality
+      attr_accessor :left, :right
+
+      def initialize left, right
+        @left  = left
+        @right = right
+      end
+    end
+  end
+end
diff --git a/spec/arel/attributes/attribute_spec.rb b/spec/arel/attributes/attribute_spec.rb
new file mode 100644
index 0000000000..5599bb7b51
--- /dev/null
+++ b/spec/arel/attributes/attribute_spec.rb
@@ -0,0 +1,17 @@
+require 'spec_helper'
+
+module Arel
+  module Attributes
+    describe 'attribute' do
+      describe '#eq' do
+        it 'should return an equality node' do
+          attribute = Attribute.new nil, nil, nil
+          equality = attribute.eq 1
+          equality.left.should == attribute
+          equality.right.should == 1
+          equality.should be_kind_of Nodes::Equality
+        end
+      end
+    end
+  end
+end