Merge pull request #55 from samuelkadolph/add_predicates_to_function_node

Include Arel::Predicates to Arel::Nodes::Function

lib/arel/nodes/function.rb

@@ -2,6 +2,7 @@ module Arel
   module Nodes
     class Function < Arel::Nodes::Node
       include Arel::Expression
+      include Arel::Predications
       attr_accessor :expressions, :alias, :distinct
 
       def initialize expr, aliaz = nil

lib/arel/nodes/named_function.rb

@@ -3,8 +3,6 @@ module Nodes
     class NamedFunction < Arel::Nodes::Function
       attr_accessor :name
 
-      include Arel::Predications
-
       def initialize name, expr, aliaz = nil
         super(expr, aliaz)
         @name = name

test/nodes/test_count.rb

@@ -15,4 +15,13 @@
       }
     end
   end
+
+  describe "eq" do
+    it "should compare the count" do
+      table = Arel::Table.new :users
+      table[:id].count.eq(2).to_sql.must_be_like %{
+        COUNT("users"."id") = 2
+      }
+    end
+  end
 end