Matcher

The Matcher class encapsulates a particular comparison clause on an Attribute. Matchers can evaluate whether or not an object matches them, and also compose SQL clauses for the RxDatabase. Each matcher has a reference to a model attribute, a comparator and a value. This class is heavily inspired by NSPredicate on Mac OS X / CoreData.

// Retrieving Matchers

const isUnread = Thread.attributes.unread.equal(true);

const hasLabel = Thread.attributes.categories.contains('label-id-123');

// Using Matchers in Database Queries

const db.findAll(Thread).where(isUnread)...

// Using Matchers to test Models

const threadA = new Thread({unread: true})
const threadB = new Thread({unread: false})

isUnread.evaluate(threadA)
// => true

isUnread.evaluate(threadB)
// => false