ApolloLink.from doesn't work with custom links

[jchavarri]

In 0.7.0, when using ApolloLink.from with a custom made link, the (operation, forward) => ... callback is not called.

Intended outcome:
After reading the docs:

from is typically used when you have many links to join together all at once. The alternative way to join links is the concat method which joins two links together into one.

I was expecting I could implement my own authLink and the operations could be forwarded like with concat.

Actual outcome:
The custom link forwarding callback is never called.

How to reproduce the issue:
Create a custom link and then join it with an Apollo Link using from:

import { HttpLink } from 'apollo-link-http';
...
const logLink = new ApolloLink((operation, forward) => {
  return forward(operation).map((data) => {
    console.log('logging');
    return forward(operation);
  })
});
const link = ApolloLink.from([
   new HttpLink({ uri }),
   logLink,
]);
const client = new ApolloClient({
  cache: new InMemoryCache()
  link,
});
// `logging` will never be printed

[jchavarri]

Hm, my bad, seems logLink has to go first :)

[jonasdumas]

Thanks, it solve 2 hours of debbuging !
The httplink need to go at the end when use from()
HM!