Synchronized Links

Self-synchronizing links between objects.

review := SRTestReview new.
book := SRTestBook new.
review book: book.
self assert: review book equals: book.
self assert: book reviews asArray equals: {review}

author := SRTestAuthor new.
book := SRTestBook new.
author books add: book.
self assert: author books asArray equals: {book}.
self assert: book authors asArray equals: {author}

Installation

Metacello new
	baseline: 'OpenPonkSynchronizedLinks';
	repository: 'github://OpenPonk/synchronized-links/repository';
	load.

Usage

To One Link

Review has a reference to a Single books.

Review>>book
  ^ book

Review>>book: aBook
  book := SRToOneLink
    on: self
    slot: #book
    oppositeSlot: #reviews
    updateFrom: book
    to: aBook

To Many Link

Single book can have many Reviews.

Book>>reviews
	^ reviews
		ifNil: [ reviews := SRToManyLink
				on: self
				slot: #reviews
				oppositeSlot: #book ]

Book>>reviews: aCollection
  self reviews
    removeAll;
    addAll: aCollection

Combinations

The link will automatically resolve what is on the opposite side, so all variations (1:1, 1:N, N:1, N:M) work automatically.

Other possibly interesting notes

The objects are internally stored in a OrderedCollection. Support for Set/Bag/OrderedSet will be probably added in the future. Slot implementation will probably also be added in the future.