Lentil Hoffman
73d2bf23f5
- Implement RelationshipGraphResolver extending Lossy - Add type-safe accumulator for relationship graph state - Update tests and documentation
86 lines
2.4 KiB
TypeScript
86 lines
2.4 KiB
TypeScript
import Debug from 'debug';
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import { PointerTarget } from "../../../src/core/delta";
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import { Lossless, LosslessViewOne } from "../../../src/views/lossless";
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import { Lossy } from "../../../src/views/lossy";
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import { RhizomeNode } from "../../../src/node";
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import { valueFromCollapsedDelta } from "../../../src/views/resolvers/aggregation-resolvers";
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import { lastValueFromDeltas } from "../../../src/views/resolvers/timestamp-resolvers";
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import { createDelta } from "../../../src/core/delta-builder";
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const debug = Debug('test:lossy');
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type Role = {
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actor: PointerTarget,
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film: PointerTarget,
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role: PointerTarget
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};
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type Summary = {
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roles: Role[];
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};
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class Summarizer extends Lossy<Summary, Summary> {
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initializer(): Summary {
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return {
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roles: []
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};
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}
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// TODO: Add more rigor to this example approach to generating a summary.
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// it's really not CRDT, it likely depends on the order of the pointers.
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// TODO: Prove with failing test
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reducer(acc: Summary, cur: LosslessViewOne): Summary {
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if (cur.referencedAs.includes("role")) {
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const {delta, value: actor} = lastValueFromDeltas("actor", cur.propertyDeltas["actor"]) ?? {};
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if (!delta) throw new Error('expected to find delta');
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if (!actor) throw new Error('expected to find actor');
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const film = valueFromCollapsedDelta("film", delta);
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if (!film) throw new Error('expected to find film');
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acc.roles.push({
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role: cur.id,
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actor,
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film
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});
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}
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return acc;
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}
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resolver(acc: Summary): Summary {
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return acc;
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}
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}
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describe('Lossy', () => {
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describe('use a provided initializer, reducer, and resolver to resolve entity views', () => {
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const node = new RhizomeNode();
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const lossless = new Lossless(node);
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const lossy = new Summarizer(lossless);
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beforeAll(() => {
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lossless.ingestDelta(createDelta('a', 'h')
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.addPointer('actor', 'keanu', 'roles')
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.addPointer('role', 'neo', 'actor')
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.addPointer('film', 'the_matrix', 'cast')
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.addPointer('base_salary', 1000000)
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.addPointer('salary_currency', 'usd')
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.buildV1()
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);
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});
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it('example summary', () => {
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const result = lossy.resolve();
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debug('result', result);
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expect(result).toEqual({
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roles: [{
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film: "the_matrix",
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role: "neo",
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actor: "keanu"
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}]
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});
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});
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});
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});
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