spine: Fix the "mark all complete" checkbox

Fixes #795

examples/spine/js/app.js

-// Generated by CoffeeScript 1.9.1
+// Generated by CoffeeScript 1.10.0
 (function() {
   var TodoApp,
     bind = function(fn, me){ return function(){ return fn.apply(me, arguments); }; },
@@ -96,13 +96,15 @@
     };
 
     TodoApp.prototype.toggleAll = function(e) {
+      var checked;
+      checked = e.target.checked;
       return Todo.each(function(todo) {
 
         /*
         			TODO: Model updateAttribute sometimes won't stick:
         				https://github.com/maccman/spine/issues/219
          */
-        todo.updateAttribute('completed', e.target.checked);
+        todo.updateAttribute('completed', checked);
         return todo.trigger('update', todo);
       });
     };
@@ -112,14 +114,13 @@
     };
 
     TodoApp.prototype.toggleElems = function() {
-      var isTodos;
-      isTodos = !!Todo.count();
-      this.main.toggle(isTodos);
-      this.footer.toggle(isTodos);
-      this.clearCompleted.toggle(!!Todo.completed().length);
-      if (!Todo.completed().length) {
-        return this.toggleAllElem.removeAttr('checked');
-      }
+      var completed, total;
+      completed = Todo.completed().length;
+      total = Todo.count();
+      this.main.toggle(total !== 0);
+      this.footer.toggle(total !== 0);
+      this.toggleAllElem.prop('checked', completed === total);
+      return this.clearCompleted.toggle(completed !== 0);
     };
 
     TodoApp.prototype.renderFooter = function() {

examples/spine/src/app.coffee

@@ -57,23 +57,25 @@ class TodoApp extends Spine.Controller
 		@addNew todo for todo in @getByFilter()
 
 	toggleAll: (e) ->
+		checked = e.target.checked
 		Todo.each (todo) ->
 			###
 			TODO: Model updateAttribute sometimes won't stick:
 				https://github.com/maccman/spine/issues/219
 			###
-			todo.updateAttribute 'completed', e.target.checked
+			todo.updateAttribute 'completed', checked
 			todo.trigger 'update', todo
 
 	clearCompletedItem: ->
 		Todo.destroyCompleted()
 
 	toggleElems: =>
-		isTodos = !!Todo.count()
-		@main.toggle isTodos
-		@footer.toggle isTodos
-		@clearCompleted.toggle !!Todo.completed().length
-		@toggleAllElem.removeAttr 'checked' if !Todo.completed().length
+		completed = Todo.completed().length
+		total = Todo.count()
+		@main.toggle total != 0
+		@footer.toggle total != 0
+		@toggleAllElem.prop 'checked', completed == total
+		@clearCompleted.toggle completed != 0
 
 	renderFooter: =>
 		text = (count) -> if count is 1 then 'item' else 'items'