Efficiently merging data from various AngularJS resources

I've encountered a recurring scenario while developing Angular apps, especially when utilizing a Drupal API. I'm seeking advice on best practices for handling this specific issue.

Currently, I am working on an app that interacts with a Drupal API. The API exposes certain resources but only provides references to additional resources in some cases. To fully utilize these resources in my views, I need to make multiple calls and combine the data into one final object.

For example, when retrieving an article from the API, it also includes a list of comments with basic information. However, I need to retrieve detailed comment data by making separate calls for each comment and combining it with the article data for display.

In my view, I use ng-repeat to iterate over the comments array like so:

<div class="" ng-repeat="note in row.comments">
</div>

My goal is to append the extended comment information to each item in the comments array rather than simply adding it at the end of the array. This poses a challenge in structuring the data correctly.

Here is a snippet of my current controller code:

  OnenodeFactory.query({id: $stateParams.nid, 'deep-load-refs': 1}, function(data) {
    $scope.row = data;
    if (data.comments.length >= 1) {
      $scope.iscomment = true;
      var i;
      for(i = 0; i < data.comments.length; i++){
        UserFactory.query({ name: $scope.row.comments[i].comment.name}, function (usr) {  
          $scope.row.comments.push(usr); 
        });
      }      
    } else {
      $scope.iscomment = false; 
    }
  });

This implementation results in new items being added within the comments array instead of appending the data as intended.

I often encounter similar challenges where APIs provide reference data necessitating additional calls to construct comprehensive data sets. Any guidance on addressing this overarching issue would be greatly appreciated.

While I am familiar with promises and parallel loading of data, the objective here is to consolidate all data sources for seamless integration with NG-repeat. Open to suggestions and insights on alternative approaches to streamline this process.

Answer №1

To update comments, first check if they already exist. If not, fetch them.

$scope.row = data; // Update $scope.comments instead of replacing it entirely.

Here is a basic example to demonstrate the concept:

var newComments;

$scope.row.author = data.author; // Do not assign comments yet...
......

if($scope.hasOwnProperty('comments')){

  // Loop through and add new comments to newComments array.
  for(var i; i < data.comments.length, i++){
     for(){ // Loop through $scope.rows.comments
       if($scope.row.comments[i].id === data.comments[i]){
          newComments.push(data.comments[i]);   
       }
     }
  }

}else{
   newComments= comments;    
}

// Now you can iterate through newComments, retrieve them...

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