[Pkg-javascript-commits] [backbone] 41/101: testing a handful of the underscore methods on collections

[Jonas Smedegaard]

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js pushed a commit to tag 0.1.0
in repository backbone.

commit d343aa5fec0d66e4a48b888da65fc3dc5c3b32a3
Author: Jeremy Ashkenas <jashkenas at gmail.com>
Date:   Wed Oct 6 13:52:25 2010 -0400

    testing a handful of the underscore methods on collections
---
 backbone.js        | 13 +++++++++----
 test/collection.js | 19 +++++++++++++++++++
 2 files changed, 28 insertions(+), 4 deletions(-)

diff --git a/backbone.js b/backbone.js
index 4a863ab..26cc75f 100644
--- a/backbone.js
+++ b/backbone.js
@@ -306,6 +306,11 @@
       return cid && this._byCid[cid.cid || cid];
     },
 
+    // Get the model at the given index.
+    at: function(index) {
+      return this.models[index];
+    },
+
     // What are the ids for every model in the set?
     getIds : function() {
       return _.keys(this._byId);
@@ -316,9 +321,9 @@
       return _.keys(this._byCid);
     },
 
-    // Get the model at the given index.
-    at: function(index) {
-      return this.models[index];
+    // Pluck an attribute from each model in the collection.
+    pluck : function(attr) {
+      return _.map(this.models, function(model){ return model.get(attr); });
     },
 
     // Add a model, or list of models to the set. Pass **silent** to avoid
@@ -445,7 +450,7 @@
 
   // Underscore methods that we want to implement on the Collection.
   var methods = ['each', 'map', 'reduce', 'reduceRight', 'detect', 'select',
-    'reject', 'all', 'any', 'include', 'invoke', 'pluck', 'max', 'min', 'sortBy',
+    'reject', 'all', 'any', 'include', 'invoke', 'max', 'min', 'sortBy',
     'sortedIndex', 'toArray', 'size', 'first', 'rest', 'last', 'without',
     'indexOf', 'lastIndexOf', 'isEmpty'];
 
diff --git a/test/collection.js b/test/collection.js
index 9a026ac..cfd27a6 100644
--- a/test/collection.js
+++ b/test/collection.js
@@ -44,6 +44,10 @@ $(document).ready(function() {
     equals(col.at(2), b);
   });
 
+  test("collections: pluck", function() {
+    equals(col.pluck('label').join(' '), 'd c b a');
+  });
+
   test("collections: add", function() {
     var added = null;
     col.bind('add', function(model){ added = model.get('label'); });
@@ -91,4 +95,19 @@ $(document).ready(function() {
     equals(model.collection, col);
   });
 
+  test("collections: Underscore methods", function() {
+    equals(col.map(function(model){ return model.get('label'); }).join(' '), 'd c b a');
+    equals(col.any(function(model){ return model.id === 100; }), false);
+    equals(col.any(function(model){ return model.id === 1; }), true);
+    equals(col.indexOf(b), 2);
+    equals(col.size(), 4);
+    equals(col.rest().length, 3);
+    ok(!_.include(col.rest()), a);
+    ok(!_.include(col.rest()), d);
+    ok(!col.isEmpty());
+    ok(!_.include(col.without(d)), d);
+    equals(col.max(function(model){ return model.id; }).id, 4);
+    equals(col.min(function(model){ return model.id; }).id, 1);
+  });
+
 });

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