md-select doesn't reflect changes in the model when using key-value parameters

I am facing an issue with my predefined model (selectedVegetables) in connection with an md-select. It appears to be not functioning properly when the model already contains a key and value pair. You can view the code sample here: Code Pen.

Here is a snippet of the relevant code:

$scope.vegetables = 
    [{"key":"1","value":"Banana"},{"key":"2","value":"Apple"}];
$scope.selectedVegetables = [{"key":"1","value":"Apple"}];

This is defined in my controller.

Below is the HTML snippet:

<md-input-container>
    <label>Vegetables</label>
    <md-select ng-model="selectedVegetables" md-on-close="clearSearchTerm()" data-md-container-class="selectdemoSelectHeader" multiple="">
      <md-select-header class="demo-select-header">
        <input ng-model="searchTerm" placeholder="Search for a vegetable.." class="demo-header-searchbox md-text" type="search">
      </md-select-header>
      <md-optgroup label="vegetables">
        <md-option ng-value="vegetable" ng-repeat="vegetable in vegetables |
          filter:searchTerm">{{vegetable}}</md-option>
      </md-optgroup>
    </md-select>
  </md-input-container>

Answer №1

I finally figured it out! To solve the issue, simply include the following line in md-select:

ng-model-options="{trackBy: '$value.key'}"

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