Prevent redundant server responses when querying with Apollo and Angular

Question

Prevent redundant server responses when querying with Apollo and Angular

Below, you will find an example of the code I am currently using to submit data to a server and the resulting response that is received and saved:

this.apollo.mutate( { mutation: XXXXXXXX, variables: { instance_string: X, 
accesstoken: X } })
.subscribe({
   next: (data: any ) => {
     console.log("data returned from Server", data); 
     // This data can be sent from the Server in a loop on occasion
     this.SaveData(data);
   },
   error: (err) => {
     this.presentToastFail(err);
   }
 });

At times, the Server may return the data in a continuous loop. Since I have no control over the Server's behavior and it seems like this issue will persist for some time, is there a method to ensure that the 'next' function only executes once and disregards any subsequent loops of data returns from the Server?

angularjs typescript apollo

Answer 1

Answer №1

To achieve this, ensure you are utilizing two pipeable operators such as take() and filter():

.pipe(
  filter(response => response !== undefined && response !== null),
  take(1) // <--- This will only capture one successful valid response
)
.subscribe(...)

Answer 2

To achieve this, ensure you are utilizing two pipeable operators such as take() and filter():

.pipe(
  filter(response => response !== undefined && response !== null),
  take(1) // <--- This will only capture one successful valid response
)
.subscribe(...)

Answer 3

Answer №2

Additionally, you can utilize the takeuntil method as shown below: Check out this Takeuntil reference document for more information.

    const example = evenSource.pipe(
  //also track the current count of even numbers for display
  withLatestFrom(evenNumberCount),
  map(([val, count]) => `Even number (${count}) : ${val}`),
  //complete the source observable after emitting five even numbers
  takeUntil(1)//this will take 1st response
);

Answer 4

Additionally, you can utilize the takeuntil method as shown below: Check out this Takeuntil reference document for more information.

    const example = evenSource.pipe(
  //also track the current count of even numbers for display
  withLatestFrom(evenNumberCount),
  map(([val, count]) => `Even number (${count}) : ${val}`),
  //complete the source observable after emitting five even numbers
  takeUntil(1)//this will take 1st response
);

Prevent redundant server responses when querying with Apollo and Angular

Answer №1

Answer №2

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