From d5d7a8eb9935cd937441bd5233b410e5a0cfd41b Mon Sep 17 00:00:00 2001
From: Nick Kallen <nkallen@nick-kallens-computer-2.local>
Date: Sat, 16 Feb 2008 16:09:37 -0800
Subject: attribute is now a concrete ancestor of expression. seems logical.

---
 lib/active_relation/primitives/attribute.rb        | 10 +++----
 lib/active_relation/primitives/expression.rb       | 31 +++++++++-------------
 spec/active_relation/primitives/attribute_spec.rb  |  2 +-
 spec/active_relation/primitives/expression_spec.rb |  6 +++++
 4 files changed, 24 insertions(+), 25 deletions(-)

diff --git a/lib/active_relation/primitives/attribute.rb b/lib/active_relation/primitives/attribute.rb
index de25a90868..4a10dffbe5 100644
--- a/lib/active_relation/primitives/attribute.rb
+++ b/lib/active_relation/primitives/attribute.rb
@@ -34,11 +34,11 @@ module ActiveRelation
     end
 
     def ==(other)
-      self.class == other.class and
-        relation == other.relation and
-        name     == other.name and
-        @alias   == other.alias and
-        ancestor == other.ancestor
+      self.class  == other.class     and
+      relation    == other.relation  and
+      name        == other.name      and
+      @alias      == other.alias     and
+      ancestor    == other.ancestor
     end
     alias_method :eql?, :==
     
diff --git a/lib/active_relation/primitives/expression.rb b/lib/active_relation/primitives/expression.rb
index 6ff06c7f81..4d28ef108c 100644
--- a/lib/active_relation/primitives/expression.rb
+++ b/lib/active_relation/primitives/expression.rb
@@ -1,23 +1,24 @@
 module ActiveRelation
-  class Expression
+  class Expression < Attribute
     include Sql::Quoting
     
-    attr_reader :attribute, :function_sql, :alias, :ancestor
+    attr_reader :attribute, :function_sql
     delegate :relation, :to => :attribute
+    alias_method :name, :alias
     
     def initialize(attribute, function_sql, aliaz = nil, ancestor = nil)
       @attribute, @function_sql, @alias, @ancestor = attribute, function_sql, aliaz, ancestor
     end
 
     module Transformations
-      def bind(new_relation)
-        new_relation == relation ? self : Expression.new(attribute.bind(new_relation), function_sql, @alias, self)
-      end
-    
       def as(aliaz)
         Expression.new(attribute, function_sql, aliaz, self)
       end
       
+      def bind(new_relation)
+        new_relation == relation ? self : Expression.new(attribute.bind(new_relation), function_sql, @alias, self)
+      end
+          
       def to_attribute
         Attribute.new(relation, @alias, nil, self)
       end
@@ -29,20 +30,12 @@ module ActiveRelation
     end
     
     def ==(other)
-      self.class == other.class and attribute == other.attribute and function_sql == other.function_sql and ancestor == other.ancestor and @alias == other.alias
+      self.class    == other.class          and
+      attribute     == other.attribute      and
+      function_sql  == other.function_sql   and
+      ancestor      == other.ancestor       and
+      @alias        == other.alias
     end
     alias_method :eql?, :==
-    
-    def =~(other)
-      !(history & other.send(:history)).empty?
-    end
-
-    def hash
-      attribute.hash + function_sql.hash
-    end
-    
-    def history
-      [self] + (ancestor ? [ancestor, ancestor.send(:history)].flatten : [])
-    end
   end
 end
\ No newline at end of file
diff --git a/spec/active_relation/primitives/attribute_spec.rb b/spec/active_relation/primitives/attribute_spec.rb
index 6d0020d5da..535e6245b5 100644
--- a/spec/active_relation/primitives/attribute_spec.rb
+++ b/spec/active_relation/primitives/attribute_spec.rb
@@ -29,7 +29,7 @@ module ActiveRelation
       end
     
       describe '#qualify' do
-        it "manufactures an attribute aliased with that attributes qualified name" do
+        it "manufactures an attribute aliased with that attribute's qualified name" do
           @attribute.qualify.should == Attribute.new(@attribute.relation, @attribute.name, @attribute.qualified_name, @attribute)
         end
       end
diff --git a/spec/active_relation/primitives/expression_spec.rb b/spec/active_relation/primitives/expression_spec.rb
index f90ae899c3..fa854d89f9 100644
--- a/spec/active_relation/primitives/expression_spec.rb
+++ b/spec/active_relation/primitives/expression_spec.rb
@@ -34,6 +34,12 @@ module ActiveRelation
           @expression.to_attribute.should == Attribute.new(@expression.relation, @expression.alias, nil, @expression)
         end
       end
+      
+      describe '#qualify' do
+        it "manufactures an expression aliased with that expression's qualified name" do
+          @expression.qualify.should == Expression.new(@attribute, "COUNT", @expression.qualified_name, @expression)
+        end
+      end
     end
     
     describe '=~' do
-- 
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