Broken after upgrade to ember-data 1.0.0-beta.14.1

[tommyblue]

After the upgrade to ember-data 1.0.0-beta.14.1 (1.0.0-beta.12) I get this error:
Uncaught TypeError: Cannot read property 'children' of undefined at select-2.js:293:

if (item.children && item.children.length) {

this is the template:

{{select-2
  content=file.rootCategoryChildren
  value=file.selectedChildCategory
  multiple=false
  placeholderTranslation="ui.inputs.placeholders.second-image-category"
  optionValuePath="id"
  optionLabelPath="name"
  class="form-control"
  enabled=file.isRootCategorySelected
}}

file.rootCategoryChildren is initially null, when another value is selected, it's populated.
This is the select-2 input which causes file.rootCategoryChildren to be populated, which seems almost the same, but it works:

{{select-2
  content=rootCategories
  value=file.selectedRootCategory
  multiple=false
  placeholderTranslation="ui.inputs.placeholders.first-image-category"
  optionValuePath="id"
  optionLabelPath="name"
  class="form-control"
}}

and this is the function which populates rootCategoryChildren:

updateRootCategoryChildren: function() {
    this.set(
      'rootCategoryChildren',
      this.get('controllers.colored-finished-products/images-upload')
        .get('availableCategories')
        .findBy('id', this.get('selectedRootCategory'))
        .get('children')
    );
    this.set('selectedChildCategory', null);
  }.observes('selectedRootCategory')

The original availableCategories array comes from the backend, via DS.Model and a rails-api backend

[tommyblue]

@iStefo any feedback on this?

[jpaas]

I'm also having this issue. Its because the models we have fetched have an attribute called 'children' which causes them to be misconstrued as having nested content. Is there any way to reconfigure this to tell it that either A. They don't have nested content or B. To use some other attribute name for children?