django - “Incorrect type. Expected pk value, received str” error

Question

I my django-rest-framework I have the following models:

Basically every ride has one final destination and can have multiple middle destinations.

mod

Answer 1

Angular/Django Rest Framework

I had similar problem when trying to post a formdata that has a field with some array values. It turned out that I was using a wrong content-type in the post headers of angular frontend. All I needed was comment out Content-Type.

  Post(endpoint, postData) {
    let auth = `Bearer ${this.token}`;
    let headers = new HttpHeaders({
      // "Content-Type": "application/x-www-form-urlencoded",
      Authorization: auth
    });
    let fullurl = `${this.baseUrl}${endpoint}`;
   .....
  ....
}

Answer 2

The issue is that you are passing the name of the related Destination object into the serializer, instead of passing the pk/id of the Destination object. So Django REST framework is seeing this and complaining, because it can't resolve LA into an object.

It sounds like you may actually be looking for a SlugRelatedField, which allows you to identify objects by a slug (LA in this case) instead of their primary keys.