Retrieving Backbone Collection Results in the Return of Only One Model

Issue with Backbone fetching data only for the first model in the collection.

@leadgen_forms = new app.collections.LeadgenForms [],
    { event_provider_id: @event_provider_id }
@leadgen_forms.fetch
  success: _.bind ((collection, response) ->
    debugger

Upon inspecting the collection from the success function:

https://i.sstatic.net/Qg3FF.png

The screenshot above indicates a length of 11 but only one model is present. It seems like Backbone treats models as duplicates if they don't have unique ids. However, reviewing the data from the JSON service confirms that all ids are indeed unique and everything else appears to be correct:

https://i.sstatic.net/1yYE4.png

Details from the model:

window.app.models.LeadgenForm = Backbone.Model.extend
  initialize: (model, options) ->
    @event_provider_id = options.event_provider_id
    @id = options.id

  url: ->
    if @id
      '/event_providers/' + @event_provider_id + '/leadgen_forms/' + @id
    else
      '/event_providers/' + @event_provider_id + '/leadgen_forms'

window.app.collections.LeadgenForms = Backbone.Collection.extend
  model: window.app.models.LeadgenForm

  initialize: (collection, options) ->
    @event_provider_id = options.event_provider_id

  parse: (response) ->
    debugger
    return response

  url: ->
    '/event_providers/' + @event_provider_id + '/leadgen_forms'

Answer №1

My issue arose from the following line in the model:

@id = options.id

Every time a new model was created, the ID would default to null (except for the initial model).

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