I have a service that sends requests to an in-memory-web-api. The service includes a method which I want to query (via query string) the API for a single item.
Regardless of specifying a single item in the generic http.get method I am returned an array.
This differs from if a I make a call to the API for a single item using an ID rather than a query when I am returned just the single item.
this.http.get<ITrack>(`api/tracks/1`)
.subscribe(track => console.log(JSON.stringify(track)));
returns
{"id":1,"artist":"Radiohead","name":"OK Computer","durationSeconds":61,"nominator":null,"playlistPosition":1}
Where as
this.http.get<ITrack>(`api/tracks/?playlistPosition=1`)
.subscribe(track => console.log(JSON.stringify(track)));
returns
[{"id":1,"artist":"Radiohead","name":"OK Computer","durationSeconds":61,"nominator":null,"playlistPosition":1}]
I can get the second call to return just the item with the following:
this.http.get<ITrack>(`api/tracks/?playlistPosition=1`)
.pipe(
map(t => t[0])
)
.subscribe(track => console.log(JSON.stringify(track)));
However I can't use methods like single or first as the compiler is expecting a return type of ITrack.
What is the correct way to return a single item here?
So if the endpoint always returns a list, call the get
method typed with an ITrack
-array.
Simply replace .get<ITrack>(...)
with .get<ITrack[]>(...)
.
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