what is prefer way to add relation and remove relation? I found example as below, but I did't find any document about the two methods.

 case 'ADD_AUTHOR_TO_BOOK':
        Book.withId(action.payload.bookId).authors.add(action.payload.author);  // add new entity ,  add relation?  this doesn't work.
        break;
    case 'REMOVE_AUTHOR_FROM_BOOK':
        Book.withId(action.payload.bo

See: https://gist.github.com/ericelliott/f3c2a53a1d4100539f71

Advantages

See: https://medium.com/javascript-scene/you-might-not-need-typescript-or-static-types-aa7cb670a77b

• autocomplete and type inference with most IDEs
• doesn't require passing Log objects for every call (although it's encouraged)
• other non-required parameters (such as query) can be omitted
• much easier to a

We should have a test that validates each service can actually be resolved from the container (within a scope). See #339 for motivation. It would be fantastic if this could be done via reflection and not manually adding a new test every time you register a new service. I'm thinking we would define a static member that contained all the ServiceDescriptors. Then in the test we just get this member