Support :to_param option to specify how records map to params.

lib/sinatras-hat/maker.rb

@@ -92,6 +92,15 @@ def only(*actions)
         end
       end
 
+      # A way to determine a record's representation in the database
+      def to_param(name=nil)
+        if name
+          options[:to_param] = name
+        else
+          options[:to_param]
+        end
+      end
+
       # A list of actions to protect via basic auth. Protected actions
       # will have the authenticator block called before they are handled. 
       def protect(*actions)
@@ -129,9 +138,10 @@ def options
           :only => Set.new(Maker.actions.keys),
           :parent => nil,
           :finder => proc { |model, params| model.all },
-          :record => proc { |model, params| model.find_by_id(params[:id]) },
+          :record => proc { |model, params| model.send("find_by_#{to_param}", params[:id]) },
           :protect => [ ],
           :formats => { },
+          :to_param => :id,
           :credentials => { :username => 'username', :password => 'password', :realm => "The App" },
           :authenticator => proc { |username, password| [username, password] == [:username, :password].map(&credentials.method(:[])) }
         }

lib/sinatras-hat/resource.rb

@@ -17,7 +17,7 @@ def path(suffix, record=nil)
         end
 
         path = clean(path + suffix)
-        path.gsub!(/:(\w+)/) { parents.pop.id } if record
+        path.gsub!(/:(\w+)/) { parents.pop.send(@maker.to_param) } if record
         path
       end
 

spec/maker_spec.rb

@@ -147,6 +147,21 @@ class Comment; end
       end
     end
 
+    describe ":to_param" do
+      it "is :id by default" do
+        maker.options[:to_param].should == :id
+      end
+
+      it "is methodized" do
+        maker.to_param.should == :id
+      end
+
+      it "has methodized setter" do
+        maker.to_param :permalink
+        maker.to_param.should == :permalink
+      end
+    end
+
     describe ":parent" do
       it "is nil" do
         maker.options[:parent].should be_nil