Delegate #include? to #to_a.

lib/plucky/query.rb

@@ -13,7 +13,7 @@ class Query
     attr_reader    :criteria, :options, :collection
     def_delegator  :criteria, :simple?
     def_delegator  :options,  :fields?
-    def_delegators :to_a, :each
+    def_delegators :to_a, :each, :include?
 
     def initialize(collection, opts={})
       @collection, @options, @criteria = collection, OptionsHash.new, CriteriaHash.new

test/plucky/test_query.rb

@@ -524,6 +524,16 @@ class QueryTest < Test::Unit::TestCase
       end
     end
 
+    context "#include?" do
+      should "be true if included" do
+        Query.new(@collection).include?(@john).should be(true)
+      end
+
+      should "be false if not included" do
+        Query.new(@collection).include?(['_id', 'frankyboy']).should be(false)
+      end
+    end
+
     context "#to_a" do
       should "return all documents the query matches" do
         Query.new(@collection).sort(:name).to_a.