Cannot return plain objects when using inherited ObjectTypes

[cuchi]

Describe the bug
When I'm using inheritance between @ObjectType classes, I cannot return anything that is not an valid instanceof MyInheritedObjectType. This does not happen when I use just plain, non-inherited classes.

To Reproduce
There is this gist

Expected behavior
In the gist I made, query { users } plays just nice with the plain objects array I provided. TS also statically checks it with no problem.
When calling query { inheritedUsers }, I expect it to have the same behavior, but it instead fails because the array does not meet the correct type.

Logs

{
  "data": null,
  "errors": [
    {
      "message": "Expected value of type \"InheritedUser\" but got: [object Object].",
      "locations": [
        {
          "line": 2,
          "column": 3
        }
      ],
      "path": [
        "complexUsers",
        0
      ],
      "extensions": {
        "code": "INTERNAL_SERVER_ERROR",
        "exception": {
          "message": "Expected value of type \"InheritedUser\" but got: [object Object].",
          "locations": [
            {
              "line": 2,
              "column": 3
            }
          ],
          "stacktrace": [
            "Expected value of type \"InheritedUser\" but got: [object Object].",
            "",
            "GraphQL request (2:3)",
            "1: {",
            "2:   inheritedUsers {",
            "     ^",
            "3:     id",
            "",
            "    at invalidReturnTypeError (/home/paulo/src/type-graphql-test/node_modules/graphql/execution/execute.js:766:10)",
            "    at completeObjectValue (/home/paulo/src/type-graphql-test/node_modules/graphql/execution/execute.js:758:13)",
            "    at completeValue (/home/paulo/src/type-graphql-test/node_modules/graphql/execution/execute.js:660:12)",
            "    at completeValue (/home/paulo/src/type-graphql-test/node_modules/graphql/execution/execute.js:629:21)",
            "    at completeValueWithLocatedError (/home/paulo/src/type-graphql-test/node_modules/graphql/execution/execute.js:580:21)",
            "    at completeValueCatchingError (/home/paulo/src/type-graphql-test/node_modules/graphql/execution/execute.js:550:12)",
            "    at /home/paulo/src/type-graphql-test/node_modules/graphql/execution/execute.js:684:25",
            "    at Array.forEach (<anonymous>)",
            "    at forEach (/home/paulo/src/type-graphql-test/node_modules/iterall/index.js:83:25)",
            "    at completeListValue (/home/paulo/src/type-graphql-test/node_modules/graphql/execution/execute.js:680:24)"
          ]
        }
      }
    }
  ]
}

Enviorment

• OS: Debian Sid
• Node v8.11.3
• Package version 0.14.0
• TypeScript version 3.1.1

Additional context
This could easily be fixed by removing this verification, but I'm pretty sure that is here for a reason, and I could break somewhere else by removing it.

[MichalLytek]

This requirement takes place when the return type is union or your object types implements GraphQL interfaces or extends other classes. One of the super class might be implementing an GraphQL interface and unfortunately due to a limitation of current schema generation using graphql-js, I'm not able to detect it during ObjectType generation in schema.

[MichalLytek]

Reopening as it should be fixed along with metadata storage refactoring 🔓

[hcharley]

I think I am experiencing this as well.

[maxprilutskiy]

+1. Highly useful feature, in terms of reducing code duplication. Can't wait to extract some fields to a BaseModel ObjectType:

@ObjectType()
class BaseModel {
  @Field(() => String)
  public id: string;

  @Field(() => String)
  public createdAt: string;

  @Field(() => String)
  public updatedAt: string;
}

[MichalLytek]

@prilutskiy
I also plan to add the mix(Foo).with(Bar) approach to support kinda multiple inheritance:
https://github.com/justinfagnani/mixwith.js

[vcfvct]

Having the same issue with inheritance today. Type converter is a bit heavy(for big array) and not elegant.
Hopefully this to be fixed soon. Do we roughly have a timeline for this? 😃
@19majkel94 Thanks!

[MichalLytek]

@vcfvct
Acutally, it was easier than I thought 😄 #279 🚀

[vcfvct]

@19majkel94 , You the man! 👍 👍
As I mentioned previously, would you mind let me know a rough time you are releasing this fix so that we can also plan ahead? Thanks a lot! 😃