[Feature] Reversed Foreign Key Field.

[xialvjun]

current status:

type Author {
  id: ID!
  name: String!
}

type Book {
  id: ID!
  title: String!
  author_id: ID!
  author: Author!
}

request feature:

type Author {
  id: ID!
  name: String!
  # add this field: search books by author rather than search author by book
  # name the argument as 'otherWhereClause' because there has been a whereClause: book.author_id=author.id
  books(sortCol: String, sortAsc: Boolean, otherWhereClause: String, ....): [Book!]!
}

type Book {
  id: ID!
  title: String!
  author_id: ID!
  author: Author!
}