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/test/collection.js

https://github.com/andandandand/backbone
JavaScript | 1154 lines | 1033 code | 114 blank | 7 comment | 11 complexity | 18105cb45a633bfd19b1d2aa810135c8 MD5 | raw file
   1$(document).ready(function() {
   2
   3  var a, b, c, d, e, col, otherCol;
   4
   5  module("Backbone.Collection", {
   6
   7    setup: function() {
   8      a         = new Backbone.Model({id: 3, label: 'a'});
   9      b         = new Backbone.Model({id: 2, label: 'b'});
  10      c         = new Backbone.Model({id: 1, label: 'c'});
  11      d         = new Backbone.Model({id: 0, label: 'd'});
  12      e         = null;
  13      col       = new Backbone.Collection([a,b,c,d]);
  14      otherCol  = new Backbone.Collection();
  15    }
  16
  17  });
  18
  19  test("new and sort", 9, function() {
  20    var counter = 0;
  21    col.on('sort', function(){ counter++; });
  22    equal(col.first(), a, "a should be first");
  23    equal(col.last(), d, "d should be last");
  24    col.comparator = function(a, b) {
  25      return a.id > b.id ? -1 : 1;
  26    };
  27    col.sort();
  28    equal(counter, 1);
  29    equal(col.first(), a, "a should be first");
  30    equal(col.last(), d, "d should be last");
  31    col.comparator = function(model) { return model.id; };
  32    col.sort();
  33    equal(counter, 2);
  34    equal(col.first(), d, "d should be first");
  35    equal(col.last(), a, "a should be last");
  36    equal(col.length, 4);
  37  });
  38
  39  test("String comparator.", 1, function() {
  40    var collection = new Backbone.Collection([
  41      {id: 3},
  42      {id: 1},
  43      {id: 2}
  44    ], {comparator: 'id'});
  45    deepEqual(collection.pluck('id'), [1, 2, 3]);
  46  });
  47
  48  test("new and parse", 3, function() {
  49    var Collection = Backbone.Collection.extend({
  50      parse : function(data) {
  51        return _.filter(data, function(datum) {
  52          return datum.a % 2 === 0;
  53        });
  54      }
  55    });
  56    var models = [{a: 1}, {a: 2}, {a: 3}, {a: 4}];
  57    var collection = new Collection(models, {parse: true});
  58    strictEqual(collection.length, 2);
  59    strictEqual(collection.first().get('a'), 2);
  60    strictEqual(collection.last().get('a'), 4);
  61  });
  62
  63  test("get", 6, function() {
  64    equal(col.get(0), d);
  65    equal(col.get(d.clone()), d);
  66    equal(col.get(2), b);
  67    equal(col.get({id: 1}), c);
  68    equal(col.get(c.clone()), c);
  69    equal(col.get(col.first().cid), col.first());
  70  });
  71
  72  test("get with non-default ids", 5, function() {
  73    var col = new Backbone.Collection();
  74    var MongoModel = Backbone.Model.extend({idAttribute: '_id'});
  75    var model = new MongoModel({_id: 100});
  76    col.add(model);
  77    equal(col.get(100), model);
  78    equal(col.get(model.cid), model);
  79    equal(col.get(model), model);
  80    equal(col.get(101), void 0);
  81
  82    var col2 = new Backbone.Collection();
  83    col2.model = MongoModel;
  84    col2.add(model.attributes);
  85    equal(col2.get(model.clone()), col2.first());
  86  });
  87
  88  test("update index when id changes", 4, function() {
  89    var col = new Backbone.Collection();
  90    col.add([
  91      {id : 0, name : 'one'},
  92      {id : 1, name : 'two'}
  93    ]);
  94    var one = col.get(0);
  95    equal(one.get('name'), 'one');
  96    col.on('change:name', function (model) { ok(this.get(model)); });
  97    one.set({name: 'dalmatians', id : 101});
  98    equal(col.get(0), null);
  99    equal(col.get(101).get('name'), 'dalmatians');
 100  });
 101
 102  test("at", 1, function() {
 103    equal(col.at(2), c);
 104  });
 105
 106  test("pluck", 1, function() {
 107    equal(col.pluck('label').join(' '), 'a b c d');
 108  });
 109
 110  test("add", 10, function() {
 111    var added, opts, secondAdded;
 112    added = opts = secondAdded = null;
 113    e = new Backbone.Model({id: 10, label : 'e'});
 114    otherCol.add(e);
 115    otherCol.on('add', function() {
 116      secondAdded = true;
 117    });
 118    col.on('add', function(model, collection, options){
 119      added = model.get('label');
 120      opts = options;
 121    });
 122    col.add(e, {amazing: true});
 123    equal(added, 'e');
 124    equal(col.length, 5);
 125    equal(col.last(), e);
 126    equal(otherCol.length, 1);
 127    equal(secondAdded, null);
 128    ok(opts.amazing);
 129
 130    var f = new Backbone.Model({id: 20, label : 'f'});
 131    var g = new Backbone.Model({id: 21, label : 'g'});
 132    var h = new Backbone.Model({id: 22, label : 'h'});
 133    var atCol = new Backbone.Collection([f, g, h]);
 134    equal(atCol.length, 3);
 135    atCol.add(e, {at: 1});
 136    equal(atCol.length, 4);
 137    equal(atCol.at(1), e);
 138    equal(atCol.last(), h);
 139  });
 140
 141  test("add multiple models", 6, function() {
 142    var col = new Backbone.Collection([{at: 0}, {at: 1}, {at: 9}]);
 143    col.add([{at: 2}, {at: 3}, {at: 4}, {at: 5}, {at: 6}, {at: 7}, {at: 8}], {at: 2});
 144    for (var i = 0; i <= 5; i++) {
 145      equal(col.at(i).get('at'), i);
 146    }
 147  });
 148
 149  test("add; at should have preference over comparator", 1, function() {
 150    var Col = Backbone.Collection.extend({
 151      comparator: function(a,b) {
 152        return a.id > b.id ? -1 : 1;
 153      }
 154    });
 155
 156    var col = new Col([{id: 2}, {id: 3}]);
 157    col.add(new Backbone.Model({id: 1}), {at:   1});
 158
 159    equal(col.pluck('id').join(' '), '3 1 2');
 160  });
 161
 162  test("can't add model to collection twice", function() {
 163    var col = new Backbone.Collection([{id: 1}, {id: 2}, {id: 1}, {id: 2}, {id: 3}]);
 164    equal(col.pluck('id').join(' '), '1 2 3');
 165  });
 166
 167  test("can't add different model with same id to collection twice", 1, function() {
 168    var col = new Backbone.Collection;
 169    col.unshift({id: 101});
 170    col.add({id: 101});
 171    equal(col.length, 1);
 172  });
 173
 174  test("merge in duplicate models with {merge: true}", 3, function() {
 175    var col = new Backbone.Collection;
 176    col.add([{id: 1, name: 'Moe'}, {id: 2, name: 'Curly'}, {id: 3, name: 'Larry'}]);
 177    col.add({id: 1, name: 'Moses'});
 178    equal(col.first().get('name'), 'Moe');
 179    col.add({id: 1, name: 'Moses'}, {merge: true});
 180    equal(col.first().get('name'), 'Moses');
 181    col.add({id: 1, name: 'Tim'}, {merge: true, silent: true});
 182    equal(col.first().get('name'), 'Tim');
 183  });
 184
 185  test("add model to multiple collections", 10, function() {
 186    var counter = 0;
 187    var e = new Backbone.Model({id: 10, label : 'e'});
 188    e.on('add', function(model, collection) {
 189      counter++;
 190      equal(e, model);
 191      if (counter > 1) {
 192        equal(collection, colF);
 193      } else {
 194        equal(collection, colE);
 195      }
 196    });
 197    var colE = new Backbone.Collection([]);
 198    colE.on('add', function(model, collection) {
 199      equal(e, model);
 200      equal(colE, collection);
 201    });
 202    var colF = new Backbone.Collection([]);
 203    colF.on('add', function(model, collection) {
 204      equal(e, model);
 205      equal(colF, collection);
 206    });
 207    colE.add(e);
 208    equal(e.collection, colE);
 209    colF.add(e);
 210    equal(e.collection, colE);
 211  });
 212
 213  test("add model with parse", 1, function() {
 214    var Model = Backbone.Model.extend({
 215      parse: function(obj) {
 216        obj.value += 1;
 217        return obj;
 218      }
 219    });
 220
 221    var Col = Backbone.Collection.extend({model: Model});
 222    var col = new Col;
 223    col.add({value: 1}, {parse: true});
 224    equal(col.at(0).get('value'), 2);
 225  });
 226
 227  test("add with parse and merge", function() {
 228    var Model = Backbone.Model.extend({
 229      parse: function (data) {
 230        return data.model;
 231      }
 232    });
 233    var collection = new Backbone.Collection();
 234    collection.model = Model;
 235    collection.add({id: 1});
 236    collection.add({model: {id: 1, name: 'Alf'}}, {parse: true, merge: true});
 237    equal(collection.first().get('name'), 'Alf');
 238  });
 239
 240  test("add model to collection with sort()-style comparator", 3, function() {
 241    var col = new Backbone.Collection;
 242    col.comparator = function(a, b) {
 243      return a.get('name') < b.get('name') ? -1 : 1;
 244    };
 245    var tom = new Backbone.Model({name: 'Tom'});
 246    var rob = new Backbone.Model({name: 'Rob'});
 247    var tim = new Backbone.Model({name: 'Tim'});
 248    col.add(tom);
 249    col.add(rob);
 250    col.add(tim);
 251    equal(col.indexOf(rob), 0);
 252    equal(col.indexOf(tim), 1);
 253    equal(col.indexOf(tom), 2);
 254  });
 255
 256  test("comparator that depends on `this`", 2, function() {
 257    var col = new Backbone.Collection;
 258    col.negative = function(num) {
 259      return -num;
 260    };
 261    col.comparator = function(a) {
 262      return this.negative(a.id);
 263    };
 264    col.add([{id: 1}, {id: 2}, {id: 3}]);
 265    deepEqual(col.pluck('id'), [3, 2, 1]);
 266    col.comparator = function(a, b) {
 267      return this.negative(b.id) - this.negative(a.id);
 268    };
 269    col.sort();
 270    deepEqual(col.pluck('id'), [1, 2, 3]);
 271  });
 272
 273  test("remove", 5, function() {
 274    var removed = null;
 275    var otherRemoved = null;
 276    col.on('remove', function(model, col, options) {
 277      removed = model.get('label');
 278      equal(options.index, 3);
 279    });
 280    otherCol.on('remove', function(model, col, options) {
 281      otherRemoved = true;
 282    });
 283    col.remove(d);
 284    equal(removed, 'd');
 285    equal(col.length, 3);
 286    equal(col.first(), a);
 287    equal(otherRemoved, null);
 288  });
 289
 290  test("shift and pop", 2, function() {
 291    var col = new Backbone.Collection([{a: 'a'}, {b: 'b'}, {c: 'c'}]);
 292    equal(col.shift().get('a'), 'a');
 293    equal(col.pop().get('c'), 'c');
 294  });
 295
 296  test("slice", 2, function() {
 297    var col = new Backbone.Collection([{a: 'a'}, {b: 'b'}, {c: 'c'}]);
 298    var array = col.slice(1, 3);
 299    equal(array.length, 2);
 300    equal(array[0].get('b'), 'b');
 301  });
 302
 303  test("events are unbound on remove", 3, function() {
 304    var counter = 0;
 305    var dj = new Backbone.Model();
 306    var emcees = new Backbone.Collection([dj]);
 307    emcees.on('change', function(){ counter++; });
 308    dj.set({name : 'Kool'});
 309    equal(counter, 1);
 310    emcees.reset([]);
 311    equal(dj.collection, undefined);
 312    dj.set({name : 'Shadow'});
 313    equal(counter, 1);
 314  });
 315
 316  test("remove in multiple collections", 7, function() {
 317    var modelData = {
 318      id : 5,
 319      title : 'Othello'
 320    };
 321    var passed = false;
 322    var e = new Backbone.Model(modelData);
 323    var f = new Backbone.Model(modelData);
 324    f.on('remove', function() {
 325      passed = true;
 326    });
 327    var colE = new Backbone.Collection([e]);
 328    var colF = new Backbone.Collection([f]);
 329    ok(e != f);
 330    ok(colE.length === 1);
 331    ok(colF.length === 1);
 332    colE.remove(e);
 333    equal(passed, false);
 334    ok(colE.length === 0);
 335    colF.remove(e);
 336    ok(colF.length === 0);
 337    equal(passed, true);
 338  });
 339
 340  test("remove same model in multiple collection", 16, function() {
 341    var counter = 0;
 342    var e = new Backbone.Model({id: 5, title: 'Othello'});
 343    e.on('remove', function(model, collection) {
 344      counter++;
 345      equal(e, model);
 346      if (counter > 1) {
 347        equal(collection, colE);
 348      } else {
 349        equal(collection, colF);
 350      }
 351    });
 352    var colE = new Backbone.Collection([e]);
 353    colE.on('remove', function(model, collection) {
 354      equal(e, model);
 355      equal(colE, collection);
 356    });
 357    var colF = new Backbone.Collection([e]);
 358    colF.on('remove', function(model, collection) {
 359      equal(e, model);
 360      equal(colF, collection);
 361    });
 362    equal(colE, e.collection);
 363    colF.remove(e);
 364    ok(colF.length === 0);
 365    ok(colE.length === 1);
 366    equal(counter, 1);
 367    equal(colE, e.collection);
 368    colE.remove(e);
 369    equal(null, e.collection);
 370    ok(colE.length === 0);
 371    equal(counter, 2);
 372  });
 373
 374  test("model destroy removes from all collections", 3, function() {
 375    var e = new Backbone.Model({id: 5, title: 'Othello'});
 376    e.sync = function(method, model, options) { options.success(); };
 377    var colE = new Backbone.Collection([e]);
 378    var colF = new Backbone.Collection([e]);
 379    e.destroy();
 380    ok(colE.length === 0);
 381    ok(colF.length === 0);
 382    equal(undefined, e.collection);
 383  });
 384
 385  test("Colllection: non-persisted model destroy removes from all collections", 3, function() {
 386    var e = new Backbone.Model({title: 'Othello'});
 387    e.sync = function(method, model, options) { throw "should not be called"; };
 388    var colE = new Backbone.Collection([e]);
 389    var colF = new Backbone.Collection([e]);
 390    e.destroy();
 391    ok(colE.length === 0);
 392    ok(colF.length === 0);
 393    equal(undefined, e.collection);
 394  });
 395
 396  test("fetch", 4, function() {
 397    var collection = new Backbone.Collection;
 398    collection.url = '/test';
 399    collection.fetch();
 400    equal(this.syncArgs.method, 'read');
 401    equal(this.syncArgs.model, collection);
 402    equal(this.syncArgs.options.parse, true);
 403
 404    collection.fetch({parse: false});
 405    equal(this.syncArgs.options.parse, false);
 406  });
 407
 408  test("fetch with an error response triggers an error event", 1, function () {
 409    var collection = new Backbone.Collection();
 410    collection.on('error', function () {
 411      ok(true);
 412    });
 413    collection.sync = function (method, model, options) { options.error(); };
 414    collection.fetch();
 415  });
 416
 417  test("ensure fetch only parses once", 1, function() {
 418    var collection = new Backbone.Collection;
 419    var counter = 0;
 420    collection.parse = function(models) {
 421      counter++;
 422      return models;
 423    };
 424    collection.url = '/test';
 425    collection.fetch();
 426    this.syncArgs.options.success();
 427    equal(counter, 1);
 428  });
 429
 430  test("create", 4, function() {
 431    var collection = new Backbone.Collection;
 432    collection.url = '/test';
 433    var model = collection.create({label: 'f'}, {wait: true});
 434    equal(this.syncArgs.method, 'create');
 435    equal(this.syncArgs.model, model);
 436    equal(model.get('label'), 'f');
 437    equal(model.collection, collection);
 438  });
 439
 440  test("create with validate:true enforces validation", 2, function() {
 441    var ValidatingModel = Backbone.Model.extend({
 442      validate: function(attrs) {
 443        return "fail";
 444      }
 445    });
 446    var ValidatingCollection = Backbone.Collection.extend({
 447      model: ValidatingModel
 448    });
 449    var col = new ValidatingCollection();
 450    col.on('invalid', function (collection, attrs, options) {
 451      equal(options.validationError, 'fail');
 452    });
 453    equal(col.create({"foo":"bar"}, {validate:true}), false);
 454  });
 455
 456  test("a failing create returns model with errors", function() {
 457    var ValidatingModel = Backbone.Model.extend({
 458      validate: function(attrs) {
 459        return "fail";
 460      }
 461    });
 462    var ValidatingCollection = Backbone.Collection.extend({
 463      model: ValidatingModel
 464    });
 465    var col = new ValidatingCollection();
 466    var m = col.create({"foo":"bar"});
 467    equal(m.validationError, 'fail');
 468    equal(col.length, 1);
 469  });
 470
 471  test("initialize", 1, function() {
 472    var Collection = Backbone.Collection.extend({
 473      initialize: function() {
 474        this.one = 1;
 475      }
 476    });
 477    var coll = new Collection;
 478    equal(coll.one, 1);
 479  });
 480
 481  test("toJSON", 1, function() {
 482    equal(JSON.stringify(col), '[{"id":3,"label":"a"},{"id":2,"label":"b"},{"id":1,"label":"c"},{"id":0,"label":"d"}]');
 483  });
 484
 485  test("where and findWhere", 8, function() {
 486    var model = new Backbone.Model({a: 1});
 487    var coll = new Backbone.Collection([
 488      model,
 489      {a: 1},
 490      {a: 1, b: 2},
 491      {a: 2, b: 2},
 492      {a: 3}
 493    ]);
 494    equal(coll.where({a: 1}).length, 3);
 495    equal(coll.where({a: 2}).length, 1);
 496    equal(coll.where({a: 3}).length, 1);
 497    equal(coll.where({b: 1}).length, 0);
 498    equal(coll.where({b: 2}).length, 2);
 499    equal(coll.where({a: 1, b: 2}).length, 1);
 500    equal(coll.findWhere({a: 1}), model);
 501    equal(coll.findWhere({a: 4}), void 0);
 502  });
 503
 504  test("Underscore methods", 14, function() {
 505    equal(col.map(function(model){ return model.get('label'); }).join(' '), 'a b c d');
 506    equal(col.any(function(model){ return model.id === 100; }), false);
 507    equal(col.any(function(model){ return model.id === 0; }), true);
 508    equal(col.indexOf(b), 1);
 509    equal(col.size(), 4);
 510    equal(col.rest().length, 3);
 511    ok(!_.include(col.rest(), a));
 512    ok(_.include(col.rest(), d));
 513    ok(!col.isEmpty());
 514    ok(!_.include(col.without(d), d));
 515    equal(col.max(function(model){ return model.id; }).id, 3);
 516    equal(col.min(function(model){ return model.id; }).id, 0);
 517    deepEqual(col.chain()
 518            .filter(function(o){ return o.id % 2 === 0; })
 519            .map(function(o){ return o.id * 2; })
 520            .value(),
 521         [4, 0]);
 522    deepEqual(col.difference([c, d]), [a, b]);
 523  });
 524
 525  test("sortedIndex", function () {
 526    var model = new Backbone.Model({key: 2});
 527    var collection = new (Backbone.Collection.extend({
 528      comparator: 'key'
 529    }))([model, {key: 1}]);
 530    equal(collection.sortedIndex(model), 1);
 531    equal(collection.sortedIndex(model, 'key'), 1);
 532    equal(collection.sortedIndex(model, function (model) {
 533      return model.get('key');
 534    }), 1);
 535  });
 536
 537  test("reset", 12, function() {
 538    var resetCount = 0;
 539    var models = col.models;
 540    col.on('reset', function() { resetCount += 1; });
 541    col.reset([]);
 542    equal(resetCount, 1);
 543    equal(col.length, 0);
 544    equal(col.last(), null);
 545    col.reset(models);
 546    equal(resetCount, 2);
 547    equal(col.length, 4);
 548    equal(col.last(), d);
 549    col.reset(_.map(models, function(m){ return m.attributes; }));
 550    equal(resetCount, 3);
 551    equal(col.length, 4);
 552    ok(col.last() !== d);
 553    ok(_.isEqual(col.last().attributes, d.attributes));
 554    col.reset();
 555    equal(col.length, 0);
 556    equal(resetCount, 4);
 557  });
 558
 559  test ("reset with different values", function(){
 560    var col = new Backbone.Collection({id: 1});
 561    col.reset({id: 1, a: 1});
 562    equal(col.get(1).get('a'), 1);
 563  });
 564
 565  test("same references in reset", function() {
 566    var model = new Backbone.Model({id: 1});
 567    var collection = new Backbone.Collection({id: 1});
 568    collection.reset(model);
 569    equal(collection.get(1), model);
 570  });
 571
 572  test("reset passes caller options", 3, function() {
 573    var Model = Backbone.Model.extend({
 574      initialize: function(attrs, options) {
 575        this.model_parameter = options.model_parameter;
 576      }
 577    });
 578    var col = new (Backbone.Collection.extend({ model: Model }))();
 579    col.reset([{ astring: "green", anumber: 1 }, { astring: "blue", anumber: 2 }], { model_parameter: 'model parameter' });
 580    equal(col.length, 2);
 581    col.each(function(model) {
 582      equal(model.model_parameter, 'model parameter');
 583    });
 584  });
 585
 586  test("trigger custom events on models", 1, function() {
 587    var fired = null;
 588    a.on("custom", function() { fired = true; });
 589    a.trigger("custom");
 590    equal(fired, true);
 591  });
 592
 593  test("add does not alter arguments", 2, function(){
 594    var attrs = {};
 595    var models = [attrs];
 596    new Backbone.Collection().add(models);
 597    equal(models.length, 1);
 598    ok(attrs === models[0]);
 599  });
 600
 601  test("#714: access `model.collection` in a brand new model.", 2, function() {
 602    var collection = new Backbone.Collection;
 603    collection.url = '/test';
 604    var Model = Backbone.Model.extend({
 605      set: function(attrs) {
 606        equal(attrs.prop, 'value');
 607        equal(this.collection, collection);
 608        return this;
 609      }
 610    });
 611    collection.model = Model;
 612    collection.create({prop: 'value'});
 613  });
 614
 615  test("#574, remove its own reference to the .models array.", 2, function() {
 616    var col = new Backbone.Collection([
 617      {id: 1}, {id: 2}, {id: 3}, {id: 4}, {id: 5}, {id: 6}
 618    ]);
 619    equal(col.length, 6);
 620    col.remove(col.models);
 621    equal(col.length, 0);
 622  });
 623
 624  test("#861, adding models to a collection which do not pass validation, with validate:true", function() {
 625      var Model = Backbone.Model.extend({
 626        validate: function(attrs) {
 627          if (attrs.id == 3) return "id can't be 3";
 628        }
 629      });
 630
 631      var Collection = Backbone.Collection.extend({
 632        model: Model
 633      });
 634
 635      var collection = new Collection;
 636      collection.on("error", function() { ok(true); });
 637
 638      collection.add([{id: 1}, {id: 2}, {id: 3}, {id: 4}, {id: 5}, {id: 6}], {validate:true});
 639      deepEqual(collection.pluck('id'), [1, 2, 4, 5, 6]);
 640  });
 641
 642  test("Invalid models are discarded with validate:true.", 5, function() {
 643    var collection = new Backbone.Collection;
 644    collection.on('test', function() { ok(true); });
 645    collection.model = Backbone.Model.extend({
 646      validate: function(attrs){ if (!attrs.valid) return 'invalid'; }
 647    });
 648    var model = new collection.model({id: 1, valid: true});
 649    collection.add([model, {id: 2}], {validate:true});
 650    model.trigger('test');
 651    ok(collection.get(model.cid));
 652    ok(collection.get(1));
 653    ok(!collection.get(2));
 654    equal(collection.length, 1);
 655  });
 656
 657  test("multiple copies of the same model", 3, function() {
 658    var col = new Backbone.Collection();
 659    var model = new Backbone.Model();
 660    col.add([model, model]);
 661    equal(col.length, 1);
 662    col.add([{id: 1}, {id: 1}]);
 663    equal(col.length, 2);
 664    equal(col.last().id, 1);
 665  });
 666
 667  test("#964 - collection.get return inconsistent", 2, function() {
 668    var c = new Backbone.Collection();
 669    ok(c.get(null) === undefined);
 670    ok(c.get() === undefined);
 671  });
 672
 673  test("#1112 - passing options.model sets collection.model", 2, function() {
 674    var Model = Backbone.Model.extend({});
 675    var c = new Backbone.Collection([{id: 1}], {model: Model});
 676    ok(c.model === Model);
 677    ok(c.at(0) instanceof Model);
 678  });
 679
 680  test("null and undefined are invalid ids.", 2, function() {
 681    var model = new Backbone.Model({id: 1});
 682    var collection = new Backbone.Collection([model]);
 683    model.set({id: null});
 684    ok(!collection.get('null'));
 685    model.set({id: 1});
 686    model.set({id: undefined});
 687    ok(!collection.get('undefined'));
 688  });
 689
 690  test("falsy comparator", 4, function(){
 691    var Col = Backbone.Collection.extend({
 692      comparator: function(model){ return model.id; }
 693    });
 694    var col = new Col();
 695    var colFalse = new Col(null, {comparator: false});
 696    var colNull = new Col(null, {comparator: null});
 697    var colUndefined = new Col(null, {comparator: undefined});
 698    ok(col.comparator);
 699    ok(!colFalse.comparator);
 700    ok(!colNull.comparator);
 701    ok(colUndefined.comparator);
 702  });
 703
 704  test("#1355 - `options` is passed to success callbacks", 2, function(){
 705    var m = new Backbone.Model({x:1});
 706    var col = new Backbone.Collection();
 707    var opts = {
 708      success: function(collection, resp, options){
 709        ok(options);
 710      }
 711    };
 712    col.sync = m.sync = function( method, collection, options ){
 713      options.success(collection, [], options);
 714    };
 715    col.fetch(opts);
 716    col.create(m, opts);
 717  });
 718
 719  test("#1412 - Trigger 'request' and 'sync' events.", 4, function() {
 720    var collection = new Backbone.Collection;
 721    collection.url = '/test';
 722    Backbone.ajax = function(settings){ settings.success(); };
 723
 724    collection.on('request', function(obj, xhr, options) {
 725      ok(obj === collection, "collection has correct 'request' event after fetching");
 726    });
 727    collection.on('sync', function(obj, response, options) {
 728      ok(obj === collection, "collection has correct 'sync' event after fetching");
 729    });
 730    collection.fetch();
 731    collection.off();
 732
 733    collection.on('request', function(obj, xhr, options) {
 734      ok(obj === collection.get(1), "collection has correct 'request' event after one of its models save");
 735    });
 736    collection.on('sync', function(obj, response, options) {
 737      ok(obj === collection.get(1), "collection has correct 'sync' event after one of its models save");
 738    });
 739    collection.create({id: 1});
 740    collection.off();
 741  });
 742
 743  test("#1447 - create with wait adds model.", 1, function() {
 744    var collection = new Backbone.Collection;
 745    var model = new Backbone.Model;
 746    model.sync = function(method, model, options){ options.success(); };
 747    collection.on('add', function(){ ok(true); });
 748    collection.create(model, {wait: true});
 749  });
 750
 751  test("#1448 - add sorts collection after merge.", 1, function() {
 752    var collection = new Backbone.Collection([
 753      {id: 1, x: 1},
 754      {id: 2, x: 2}
 755    ]);
 756    collection.comparator = function(model){ return model.get('x'); };
 757    collection.add({id: 1, x: 3}, {merge: true});
 758    deepEqual(collection.pluck('id'), [2, 1]);
 759  });
 760
 761  test("#1655 - groupBy can be used with a string argument.", 3, function() {
 762    var collection = new Backbone.Collection([{x: 1}, {x: 2}]);
 763    var grouped = collection.groupBy('x');
 764    strictEqual(_.keys(grouped).length, 2);
 765    strictEqual(grouped[1][0].get('x'), 1);
 766    strictEqual(grouped[2][0].get('x'), 2);
 767  });
 768
 769  test("#1655 - sortBy can be used with a string argument.", 1, function() {
 770    var collection = new Backbone.Collection([{x: 3}, {x: 1}, {x: 2}]);
 771    var values = _.map(collection.sortBy('x'), function(model) {
 772      return model.get('x');
 773    });
 774    deepEqual(values, [1, 2, 3]);
 775  });
 776
 777  test("#1604 - Removal during iteration.", 0, function() {
 778    var collection = new Backbone.Collection([{}, {}]);
 779    collection.on('add', function() {
 780      collection.at(0).destroy();
 781    });
 782    collection.add({}, {at: 0});
 783  });
 784
 785  test("#1638 - `sort` during `add` triggers correctly.", function() {
 786    var collection = new Backbone.Collection;
 787    collection.comparator = function(model) { return model.get('x'); };
 788    var added = [];
 789    collection.on('add', function(model) {
 790      model.set({x: 3});
 791      collection.sort();
 792      added.push(model.id);
 793    });
 794    collection.add([{id: 1, x: 1}, {id: 2, x: 2}]);
 795    deepEqual(added, [1, 2]);
 796  });
 797
 798  test("fetch parses models by default", 1, function() {
 799    var model = {};
 800    var Collection = Backbone.Collection.extend({
 801      url: 'test',
 802      model: Backbone.Model.extend({
 803        parse: function(resp) {
 804          strictEqual(resp, model);
 805        }
 806      })
 807    });
 808    new Collection().fetch();
 809    this.ajaxSettings.success([model]);
 810  });
 811
 812  test("`sort` shouldn't always fire on `add`", 1, function() {
 813    var c = new Backbone.Collection([{id: 1}, {id: 2}, {id: 3}], {
 814      comparator: 'id'
 815    });
 816    c.sort = function(){ ok(true); };
 817    c.add([]);
 818    c.add({id: 1});
 819    c.add([{id: 2}, {id: 3}]);
 820    c.add({id: 4});
 821  });
 822
 823  test("#1407 parse option on constructor parses collection and models", 2, function() {
 824    var model = {
 825      namespace : [{id: 1}, {id:2}]
 826    };
 827    var Collection = Backbone.Collection.extend({
 828      model: Backbone.Model.extend({
 829        parse: function(model) {
 830          model.name = 'test';
 831          return model;
 832        }
 833      }),
 834      parse: function(model) {
 835        return model.namespace;
 836      }
 837    });
 838    var c = new Collection(model, {parse:true});
 839
 840    equal(c.length, 2);
 841    equal(c.at(0).get('name'), 'test');
 842  });
 843
 844  test("#1407 parse option on reset parses collection and models", 2, function() {
 845    var model = {
 846      namespace : [{id: 1}, {id:2}]
 847    };
 848    var Collection = Backbone.Collection.extend({
 849      model: Backbone.Model.extend({
 850        parse: function(model) {
 851          model.name = 'test';
 852          return model;
 853        }
 854      }),
 855      parse: function(model) {
 856        return model.namespace;
 857      }
 858    });
 859    var c = new Collection();
 860        c.reset(model, {parse:true});
 861
 862    equal(c.length, 2);
 863    equal(c.at(0).get('name'), 'test');
 864  });
 865
 866
 867  test("Reset includes previous models in triggered event.", 1, function() {
 868    var model = new Backbone.Model();
 869    var collection = new Backbone.Collection([model])
 870    .on('reset', function(collection, options) {
 871      deepEqual(options.previousModels, [model]);
 872    });
 873    collection.reset([]);
 874  });
 875
 876  test("set", function() {
 877    var m1 = new Backbone.Model();
 878    var m2 = new Backbone.Model({id: 2});
 879    var m3 = new Backbone.Model();
 880    var c = new Backbone.Collection([m1, m2]);
 881
 882    // Test add/change/remove events
 883    c.on('add', function(model) {
 884      strictEqual(model, m3);
 885    });
 886    c.on('change', function(model) {
 887      strictEqual(model, m2);
 888    });
 889    c.on('remove', function(model) {
 890      strictEqual(model, m1);
 891    });
 892
 893    // remove: false doesn't remove any models
 894    c.set([], {remove: false});
 895    strictEqual(c.length, 2);
 896
 897    // add: false doesn't add any models
 898    c.set([m1, m2, m3], {add: false});
 899    strictEqual(c.length, 2);
 900
 901    // merge: false doesn't change any models
 902    c.set([m1, {id: 2, a: 1}], {merge: false});
 903    strictEqual(m2.get('a'), void 0);
 904
 905    // add: false, remove: false only merges existing models
 906    c.set([m1, {id: 2, a: 0}, m3, {id: 4}], {add: false, remove: false});
 907    strictEqual(c.length, 2);
 908    strictEqual(m2.get('a'), 0);
 909
 910    // default options add/remove/merge as appropriate
 911    c.set([{id: 2, a: 1}, m3]);
 912    strictEqual(c.length, 2);
 913    strictEqual(m2.get('a'), 1);
 914
 915    // Test removing models not passing an argument
 916    c.off('remove').on('remove', function(model) {
 917      ok(model === m2 || model === m3);
 918    });
 919    c.set([]);
 920    strictEqual(c.length, 0);
 921  });
 922
 923  test("set with only cids", 3, function() {
 924    var m1 = new Backbone.Model;
 925    var m2 = new Backbone.Model;
 926    var c = new Backbone.Collection;
 927    c.set([m1, m2]);
 928    equal(c.length, 2);
 929    c.set([m1]);
 930    equal(c.length, 1);
 931    c.set([m1, m1, m1, m2, m2], {remove: false});
 932    equal(c.length, 2);
 933  });
 934
 935  test("set with only idAttribute", 3, function() {
 936    var m1 = { _id: 1 };
 937    var m2 = { _id: 2 };
 938    var col = Backbone.Collection.extend({
 939      model: Backbone.Model.extend({
 940        idAttribute: '_id'
 941      })
 942    });
 943    var c = new col;
 944    c.set([m1, m2]);
 945    equal(c.length, 2);
 946    c.set([m1]);
 947    equal(c.length, 1);
 948    c.set([m1, m1, m1, m2, m2], {remove: false});
 949    equal(c.length, 2);
 950  });
 951
 952  test("set + merge with default values defined", function() {
 953    var Model = Backbone.Model.extend({
 954      defaults: {
 955        key: 'value'
 956      }
 957    });
 958    var m = new Model({id: 1});
 959    var col = new Backbone.Collection([m], {model: Model});
 960    equal(col.first().get('key'), 'value');
 961
 962    col.set({id: 1, key: 'other'});
 963    equal(col.first().get('key'), 'other');
 964
 965    col.set({id: 1, other: 'value'});
 966    equal(col.first().get('key'), 'other');
 967    equal(col.length, 1);
 968  });
 969
 970  test('merge without mutation', function () {
 971    var Model = Backbone.Model.extend({
 972      initialize: function (attrs, options) {
 973        if (attrs.child) {
 974          this.set('child', new Model(attrs.child, options), options);
 975        }
 976      }
 977    });
 978    var Collection = Backbone.Collection.extend({model: Model});
 979    var data = [{id: 1, child: {id: 2}}];
 980    var collection = new Collection(data);
 981    equal(collection.first().id, 1);
 982    collection.set(data);
 983    equal(collection.first().id, 1);
 984    collection.set([{id: 2, child: {id: 2}}].concat(data));
 985    deepEqual(collection.pluck('id'), [2, 1]);
 986  });
 987
 988  test("`set` and model level `parse`", function() {
 989    var Model = Backbone.Model.extend({
 990      parse: function (res) { return res.model; }
 991    });
 992    var Collection = Backbone.Collection.extend({
 993      model: Model,
 994      parse: function (res) { return res.models; }
 995    });
 996    var model = new Model({id: 1});
 997    var collection = new Collection(model);
 998    collection.set({models: [
 999      {model: {id: 1}},
1000      {model: {id: 2}}
1001    ]}, {parse: true});
1002    equal(collection.first(), model);
1003  });
1004
1005  test("`set` data is only parsed once", function() {
1006    var collection = new Backbone.Collection();
1007    collection.model = Backbone.Model.extend({
1008      parse: function (data) {
1009        equal(data.parsed, void 0);
1010        data.parsed = true;
1011        return data;
1012      }
1013    });
1014    collection.set({}, {parse: true});
1015  });
1016
1017  test('`set` matches input order in the absence of a comparator', function () {
1018    var one = new Backbone.Model({id: 1});
1019    var two = new Backbone.Model({id: 2});
1020    var three = new Backbone.Model({id: 3});
1021    var collection = new Backbone.Collection([one, two, three]);
1022    collection.set([{id: 3}, {id: 2}, {id: 1}]);
1023    deepEqual(collection.models, [three, two, one]);
1024    collection.set([{id: 1}, {id: 2}]);
1025    deepEqual(collection.models, [one, two]);
1026    collection.set([two, three, one]);
1027    deepEqual(collection.models, [two, three, one]);
1028    collection.set([{id: 1}, {id: 2}], {remove: false});
1029    deepEqual(collection.models, [two, three, one]);
1030    collection.set([{id: 1}, {id: 2}, {id: 3}], {merge: false});
1031    deepEqual(collection.models, [one, two, three]);
1032    collection.set([three, two, one, {id: 4}], {add: false});
1033    deepEqual(collection.models, [one, two, three]);
1034  });
1035
1036  test("#1894 - Push should not trigger a sort", 0, function() {
1037    var Collection = Backbone.Collection.extend({
1038      comparator: 'id',
1039      sort: function() {
1040        ok(false);
1041      }
1042    });
1043    new Collection().push({id: 1});
1044  });
1045
1046  test("`set` with non-normal id", function() {
1047    var Collection = Backbone.Collection.extend({
1048      model: Backbone.Model.extend({idAttribute: '_id'})
1049    });
1050    var collection = new Collection({_id: 1});
1051    collection.set([{_id: 1, a: 1}], {add: false});
1052    equal(collection.first().get('a'), 1);
1053  });
1054
1055  test("#1894 - `sort` can optionally be turned off", 0, function() {
1056    var Collection = Backbone.Collection.extend({
1057      comparator: 'id',
1058      sort: function() { ok(true); }
1059    });
1060    new Collection().add({id: 1}, {sort: false});
1061  });
1062
1063  test("#1915 - `parse` data in the right order in `set`", function() {
1064    var collection = new (Backbone.Collection.extend({
1065      parse: function (data) {
1066        strictEqual(data.status, 'ok');
1067        return data.data;
1068      }
1069    }));
1070    var res = {status: 'ok', data:[{id: 1}]};
1071    collection.set(res, {parse: true});
1072  });
1073
1074  asyncTest("#1939 - `parse` is passed `options`", 1, function () {
1075    var collection = new (Backbone.Collection.extend({
1076      url: '/',
1077      parse: function (data, options) {
1078        strictEqual(options.xhr.someHeader, 'headerValue');
1079        return data;
1080      }
1081    }));
1082    var ajax = Backbone.ajax;
1083    Backbone.ajax = function (params) {
1084      _.defer(params.success);
1085      return {someHeader: 'headerValue'};
1086    };
1087    collection.fetch({
1088      success: function () { start(); }
1089    });
1090    Backbone.ajax = ajax;
1091  });
1092
1093  test("`add` only `sort`s when necessary", 2, function () {
1094    var collection = new (Backbone.Collection.extend({
1095      comparator: 'a'
1096    }))([{id: 1}, {id: 2}, {id: 3}]);
1097    collection.on('sort', function () { ok(true); });
1098    collection.add({id: 4}); // do sort, new model
1099    collection.add({id: 1, a: 1}, {merge: true}); // do sort, comparator change
1100    collection.add({id: 1, b: 1}, {merge: true}); // don't sort, no comparator change
1101    collection.add({id: 1, a: 1}, {merge: true}); // don't sort, no comparator change
1102    collection.add(collection.models); // don't sort, nothing new
1103    collection.add(collection.models, {merge: true}); // don't sort
1104  });
1105
1106  test("`add` only `sort`s when necessary with comparator function", 3, function () {
1107    var collection = new (Backbone.Collection.extend({
1108      comparator: function(a, b) {
1109        return a.get('a') > b.get('a') ? 1 : (a.get('a') < b.get('a') ? -1 : 0);
1110      }
1111    }))([{id: 1}, {id: 2}, {id: 3}]);
1112    collection.on('sort', function () { ok(true); });
1113    collection.add({id: 4}); // do sort, new model
1114    collection.add({id: 1, a: 1}, {merge: true}); // do sort, model change
1115    collection.add({id: 1, b: 1}, {merge: true}); // do sort, model change
1116    collection.add({id: 1, a: 1}, {merge: true}); // don't sort, no model change
1117    collection.add(collection.models); // don't sort, nothing new
1118    collection.add(collection.models, {merge: true}); // don't sort
1119  });
1120
1121  test("Attach options to collection.", 2, function() {
1122    var model = new Backbone.Model;
1123    var comparator = function(){};
1124
1125    var collection = new Backbone.Collection([], {
1126      model: model,
1127      comparator: comparator
1128    });
1129
1130    ok(collection.model === model);
1131    ok(collection.comparator === comparator);
1132  });
1133
1134  test("`add` overrides `set` flags", function () {
1135    var collection = new Backbone.Collection();
1136    collection.once('add', function (model, collection, options) {
1137      collection.add({id: 2}, options);
1138    });
1139    collection.set({id: 1});
1140    equal(collection.length, 2);
1141  });
1142
1143  test("#2606 - Collection#create, success arguments", 1, function() {
1144    var collection = new Backbone.Collection;
1145    collection.url = 'test';
1146    collection.create({}, {
1147      success: function(model, resp, options) {
1148        strictEqual(resp, 'response');
1149      }
1150    });
1151    this.ajaxSettings.success('response');
1152  });
1153
1154});