Added support for dynamic matchers

lib/role_model/implementation.rb

@@ -58,6 +58,22 @@ module RoleModel
       self.send("#{self.class.roles_attribute_name}") == self.class.mask_for(*roles)
     end
     alias_method :is_exactly?, :has_only_roles?
+    
+    # Dynamic matchers:
+    #   #is_<:role>?
+    #   #<:role>?
+    #
+    # Defines new methods which call #is?(:role)
+    def method_missing(name, *args, &block)
+      if name =~ /^(?:is_)?(.+)\?$/
+        role = $1.to_sym
+        self.class.instance_eval do
+          define_method(name.to_sym) { is? role }
+        end
+        return self.send(name)
+      end
+      super
+    end
 
   end
 end

spec/role_model_spec.rb

@@ -296,6 +296,32 @@ describe RoleModel do
       end
     end
   end
+  
+  describe "dynamically query for an individual role" do
+    subject { model_class.new }
+    
+    it "should return true when the given role was assigned" do
+      subject.roles = :foo
+      subject.is_foo?.should be_true
+      subject.foo?.should be_true
+    end
+
+    it "should return false when the given role was not assigned" do
+      subject.roles = :bar
+      subject.is_foo?.should be_false
+      subject.foo?.should be_false
+    end
+
+    it "should return false when no role was assigned" do
+      subject.is_foo?.should be_false
+      subject.bar?.should be_false
+    end
+
+    it "should return false when asked for an undefined role" do
+      subject.baz?.should be_false
+      subject.is_baz?.should be_false
+    end
+  end
 
   context "query for multiple roles" do
     [:has_any_role?, :is_any_of?, :has_role?].each do |check_role_assignment_method|