Any reason books is not part of the Author model?

[dgtlmonk]

Hey! Awesome tutorial and loving this.

Just a question and probably a suggestion.

graphql-playlist/server/models/author.js

Lines 4 to 7 in 7a11b2b

	const authorSchema = new Schema({
	name: String,
	age: Number
	});

For clarity purpose, any reason books is not part of Author model? Since, books can be part of the graphql query.

e.g.

const authorSchema = new Schema({
    name: String,
    age: Number, 
    books: Array
});

GQL query

{
  author(id: "cdf0506f8f561f87c1d8d140") {
    name
    books {
      name
    }
  }
}

[dgtlmonk]

Let me know if this is reasonable and i'll send PR :)