Support different response types when making nested API calls

Question

Support different response types when making nested API calls

When working with two API calls that return different responses, one typed as TestData1Res and the other as TestData2Res, how can I handle the scenario where the response could be either type and process the property?

`TestData1Res{ testData: string }

TestData2Res{ data: string }

this.getData1().pipe(catchError(error => this.getData2()))
  .subscribe(
    (res: TestData1Res|TestData2Res) => {
      if (res.testData) { //error 'Property 'testData' does not exist on type 'TestData1Res | TestData2Res'
      }
      if (res.data) { //error 'Property 'data' does not exist on type 'TestData1Res | TestData2Res'
      }
    }
  );`

angular typescript observable

Answer 1

Answer №1

Utilizing dynamic data type could prove beneficial

    Implementing dynamic data types in this scenario may yield positive results:
    
    this.getData1().pipe(catchError(error => this.getData2()))
  .subscribe(
    (res: any) => {
      if (res["testData"]) { 
        // Execute code block
      }
      if (res["data"]) { 
        // Execute code block
      }
    }
  );

Answer 2

Utilizing dynamic data type could prove beneficial

    Implementing dynamic data types in this scenario may yield positive results:
    
    this.getData1().pipe(catchError(error => this.getData2()))
  .subscribe(
    (res: any) => {
      if (res["testData"]) { 
        // Execute code block
      }
      if (res["data"]) { 
        // Execute code block
      }
    }
  );

Answer 3

Answer №2

When you need to make consecutive API calls, one after the other:

this.getData1().subscribe(data => {
    // Successfully received data from getData1
    this.getData2().subscribe(data => {
        // Successfully received data from getData2
    }, err => {
        // Error with getData2
    }) 
}, err => {
    // Error with getData1
})

If you want to make both API calls simultaneously, you can utilize forkjoin from rxjs:

forkjoin([this.getData1(), this.getData2()]).subscribe(result => {
    // result[0] - Result of getData1
    // result[1] - Result of getData2
}, err => {
    // Handle error if something goes wrong
})

Answer 4

When you need to make consecutive API calls, one after the other:

this.getData1().subscribe(data => {
    // Successfully received data from getData1
    this.getData2().subscribe(data => {
        // Successfully received data from getData2
    }, err => {
        // Error with getData2
    }) 
}, err => {
    // Error with getData1
})

If you want to make both API calls simultaneously, you can utilize forkjoin from rxjs:

forkjoin([this.getData1(), this.getData2()]).subscribe(result => {
    // result[0] - Result of getData1
    // result[1] - Result of getData2
}, err => {
    // Handle error if something goes wrong
})

Support different response types when making nested API calls

Answer №1

Answer №2

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