Using RxJS v5 for Sending a POST Request with Parameters

Snippet of my RxJS code:

.mergeMap(action => {
  const user = store.getState().user;
  return ajax.post(`${config.API_BASE_URL}/api/v1/rsvps`, {
    rsvp: {
      meetup_id: action.payload,
      user_id: user.id,
    }
  })
  .map(action => calendarActions.rsvpAdded(action.payload));
})

The server response indicates incorrect parameter format:

[info] POST /api/v1/rsvps
[debug] Processing by ParrotApi.RsvpController.create/2
  Parameters: %{"rsvp" => "[object Object]"}
  Pipelines: [:api_auth]
[info] Sent 400 in 10ms

Attempted to use JSON.stringify resulting in parameters being converted to a string:

rsvp: JSON.stringify({
  meetup_id: action.payload,
  user_id: 123,
})

Updated Params:

%{"rsvp" => "{\"meetup_id\":1,\"user_id\":123}"}

Answer №1

If your server expects a specific parameter format, it's important to include the proper headers when sending a JSON payload. In RxJS 5, you can achieve this by using the following code:

ajax.post('url', {param: 42}, { 'Content-Type': 'application/json' });

With this method, the body payload will be automatically converted to JSON. Alternatively, if you prefer not to send headers, you can manually convert the entire object to JSON like so:

ajax.post('url', JSON.stringify({param: 42}));

It is recommended not to mix these two methods by including headers and manually calling JSON.stringify, as this would result in double conversion of the payload into JSON.

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