[falcor] idempotent book operations

[joshdmiller]

Summary

Create falcor routes to retrieve books and set their properties. This does not address non-idempotent book operations (e.g. calls).

See also #8.

Authentication & Authorization

The current user must have read permissions of the world for any get operations and write or owner permissions for any set operations.

Books of a World

worldsById[id: string].books.length

Immutable.

Gets the total number of books of this world.

worldsById[id: string].books[index: number]

Immutable.

Gets a reference to booksById[bookId: string], where the book is determined by its index position in the results of a Neo4j query to fetch non-archived* (:World)<-[:IN]-(:Book) paths ordered by the creation time of the book.

Books by ID

booksById[id: string][ key: AllowableProp ]

Sets or gets the property provided in MongoDB, with the slug being computed from the title.

type AllowableProp = '_id' | 'title' | 'slug' | 'created_at';

The created_at property is stored in both MongoDB and Neo4j.

booksById[id: string].world

Returns a reference to worldById[worldId: string], as determined by the non-archived* relationship (:World)<-[:IN]-(:Book).

booksById[id: string].status

Immutable.

Returns "O" to indicate the outline status. In subsequent iterations, it will be mutable and dynamic.

Footnotes

Non-archived relationships are those that have not been archived her #11.