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Collection.add return value no longer the same as Backbone.Collection's #419

mlilley opened this issue Nov 20, 2013 · 5 comments


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mlilley commented Nov 20, 2013

According to the Backbone docs, Collection.add() returns the added model (or array of models when adding multiple), and the changelog says this changed for all of set, add, remove, and reset in version 1.1 (previous behaviour was to return the collection).

Issue #412 and associated fix 285161e shows some work was done on this to bring backbone-relational into line (specifically for set) in master.

Unfortunately either add didn't get the same love, or the fix didn't work completely -- I'm seeing add return an array in both cases, instead of just the model when adding a single item (using backbone-relational master).

I haven't checked whether set, remove, and reset are likewise affected.

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mlilley commented Nov 20, 2013

Yeah, ok, I'm seeing the issue for all 4 functions.

Here's some quick and dirty code showing the problems:
(change Car to extend Backbone.Model, and the return values differ)

var Car  = Backbone.RelationalModel.extend({ });
var Cars = Backbone.Collection.extend({ model: Car });
var cars = new Cars();

console.log(cars.add({name:'A'}));                  // returns [model] (should not be array)
console.log(cars.add([{name:'B'},{name:'C'}]));     // returns [model,model] (OK)

console.log(cars.remove(;               // returns [model] (should not be array)
console.log(cars.remove([,])); // returns [model,model] (OK)

console.log(cars.reset({name:'D'}));                // returns [model] (should not be array)
console.log(cars.reset([{name:'E'},{name:'F'}]));   // returns [model,model] (OK)

var e =, f =;
console.log(cars.set(e));                           // returns [model] (should not be array)
console.log(cars.set([e,f]));                       // returns [model,model] (OK)

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mlilley commented Nov 20, 2013


eostrom added a commit to eostrom/santa that referenced this issue Dec 7, 2013
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This was the correct behavior for Backbone 1.0. Backbone 1.1 adds different behavior when 'single' models are added to a collection.

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Any chance of seeing a new release with this fix? Cheers.

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Yep, I'm looking a couple more issues I'd like to fix before creating a new release. Won't be too long (well, I hope ;).

nl0 added a commit to nl0/Backbone-relational that referenced this issue Feb 25, 2014
* upstream/master: (35 commits)
  Upgrade qunit
  Fix subModels not being populated properly on Underscore 1.6.0, due to `_.each` api change.
  Fire change events right away if we're not in a nested scenario. Fixes PaulUithol#427
  Document `store.unregister`
  `store.unregister` now also accepts collections or a model type
  Change `findOrCreate` to pass `parsedAttributes` to `build`, and adjust tests to reflect change.
  Remove unnecessary locking
  Update change log
  Add test for models not being added to store until they get an id
  Change where we listen to `relational:unregister`.
  Only add models with an id to the store. Closes PaulUithol#411
  Fix a bug in the (crude) performance test
  Add a small test for `clear`
  Fix collection return values when setting/removing `[]` and `null`. Ref PaulUithol#419
  Clarify the behavior of `findOrCreate` when it just a receives a scalar value. Ref PaulUithol#399
  Proper return values on collection methods for Backbone 1.1. Closes PaulUithol#419
  Submodels: accommodate multiple 'type' keys for the same submodel. Closes PaulUithol#429
  Hmm, fix spaces/tabs mix in the example
  Update a few version numbers in the docs to 0.8.7
  Backbone-relational 0.8.7
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