Angular: Leveraging Nested Callbacks for Efficient HTTP Queries

Question

Angular: Leveraging Nested Callbacks for Efficient HTTP Queries

I'm currently facing an issue with structured English.

GET HTTP Resource
   FOR every data item received do 
       GET another HTTP Resource
       Alter the original data from the outer loop with data from the inner GET
RETURN altered data

How can I pass the outer data to the inner request in a way that actually works? This is what I've tried so far (in pseudo code):

GET HTTP (callback function (recDataOUTER){
    GET NEW HTTP ((recDataOUTER, recDataINNER){
        Alter both data accordingly
    })
return altered data
})

Is there a more elegant solution to this problem? I am working with MongoDB and struggling with Joins as they are not supported.

javascript angularjs

Answer 1

Answer №1

Confirmation needed: Are you initiating a GET request to validate? Once the request is made, it fetches a sequence of IDs in response. The purpose is to iterate through these IDs and subsequently perform a GET request for each ID. Following this, the intention is to transfer the obtained data to the parent scope. Is my understanding accurate?

$http(...).success(function(data) {
  data.forEach(data, function(value, key) {
    $http(...).success(function(childData) {
      //Assigning childData to the parent data object
      data[key] = childData.whatever;
    });
  })
});

In this scenario, it should suffice to directly modify the data variable within the nested HTTP callback function. No scope-related issues are anticipated within this context.

As an additional point, it is commonly recommended to retrieve all necessary data through a single call rather than multiple GET requests. Although I lack full insight into your project's specifics, reconsidering your methodology might be beneficial.

Answer 2

Confirmation needed: Are you initiating a GET request to validate? Once the request is made, it fetches a sequence of IDs in response. The purpose is to iterate through these IDs and subsequently perform a GET request for each ID. Following this, the intention is to transfer the obtained data to the parent scope. Is my understanding accurate?

$http(...).success(function(data) {
  data.forEach(data, function(value, key) {
    $http(...).success(function(childData) {
      //Assigning childData to the parent data object
      data[key] = childData.whatever;
    });
  })
});

In this scenario, it should suffice to directly modify the data variable within the nested HTTP callback function. No scope-related issues are anticipated within this context.

As an additional point, it is commonly recommended to retrieve all necessary data through a single call rather than multiple GET requests. Although I lack full insight into your project's specifics, reconsidering your methodology might be beneficial.

Angular: Leveraging Nested Callbacks for Efficient HTTP Queries

Answer №1

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