[Pkg-javascript-commits] [backbone] 09/15: Issue #80. Adding default attributes to Backbone.Model

[Jonas Smedegaard]

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js pushed a commit to tag 0.3.2
in repository backbone.

commit f3e961da08b1560aa48763302cc5185d290d4659
Author: Jeremy Ashkenas <jashkenas at gmail.com>
Date:   Mon Nov 22 14:22:21 2010 -0500

    Issue #80. Adding default attributes to Backbone.Model
---
 backbone.js   |  4 +++-
 index.html    | 21 +++++++++++++++++++++
 test/model.js | 12 ++++++++++++
 3 files changed, 36 insertions(+), 1 deletion(-)

diff --git a/backbone.js b/backbone.js
index bf9439b..561e6bb 100644
--- a/backbone.js
+++ b/backbone.js
@@ -113,9 +113,11 @@
   // Create a new model, with defined attributes. A client id (`cid`)
   // is automatically generated and assigned for you.
   Backbone.Model = function(attributes, options) {
+    attributes || (attributes = {});
+    if (this.defaults) attributes = _.extend({}, this.defaults, attributes);
     this.attributes = {};
     this.cid = _.uniqueId('c');
-    this.set(attributes || {}, {silent : true});
+    this.set(attributes, {silent : true});
     this._previousAttributes = _.clone(this.attributes);
     if (options && options.collection) this.collection = options.collection;
     this.initialize(attributes, options);
diff --git a/index.html b/index.html
index 5ed826c..c2ed729 100644
--- a/index.html
+++ b/index.html
@@ -173,6 +173,7 @@
       <li>– <a href="#Model-id">id</a></li>
       <li>– <a href="#Model-cid">cid</a></li>
       <li>– <a href="#Model-attributes">attributes</a></li>
+      <li>– <a href="#Model-defaults">defaults</a></li>
       <li>- <a href="#Model-toJSON">toJSON</a></li>
       <li>– <a href="#Model-fetch">fetch</a></li>
       <li>– <a href="#Model-save">save</a></li>
@@ -613,6 +614,26 @@ note.set({title: "October 12", content: "Lorem Ipsum Dolor Sit Amet..."});
       them directly. If you'd like to retrieve and munge a copy of the model's
       attributes, use <a href="#Model-toJSON">toJSON</a> instead.
     </p>
+    
+    <p id="Model-defaults">
+      <b class="header">defaults</b><code>model.defaults</code>
+      <br />
+      The <b>defaults</b> hash can be used to specify the default attributes
+      for your model. When creating an instance of the model, any unspecified 
+      attributes will be set to their default value.
+    </p>
+    
+<pre class="runnable">
+var Meal = Backbone.Model.extend({
+  defaults: {
+    "appetizer":  "caesar salad",
+    "entree":     "ravioli",
+    "dessert":    "cheesecake"
+  }
+});
+
+alert("Dessert will be " + (new Meal).get('dessert'));
+</pre>
 
     <p id="Model-toJSON">
       <b class="header">toJSON</b><code>model.toJSON()</code>
diff --git a/test/model.js b/test/model.js
index 3622015..8894987 100644
--- a/test/model.js
+++ b/test/model.js
@@ -126,6 +126,18 @@ $(document).ready(function() {
     equals(model.get('name'), undefined);
   });
 
+  test("Model: defaults", function() {
+    var Defaulted = Backbone.Model.extend({
+      defaults: {
+        "one": 1,
+        "two": 2
+      }
+    });
+    var model = new Defaulted({two: null});
+    equals(model.get('one'), 1);
+    equals(model.get('two'), null);
+  });
+
   test("Model: changed, hasChanged, changedAttributes, previous, previousAttributes", function() {
     var model = new Backbone.Model({name : "Tim", age : 10});
     model.bind('change', function() {

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