@aws-amplify/datastore/dist/esm/sync/merger.mjs

AppSyncLocal support for aws-amplify

import { OpType } from '../types.mjs';
import { getIdentifierValue } from './utils.mjs';

// https://github.com/aws-amplify/amplify-js/blob/datastore-docs/packages/datastore/docs/sync-engine.md#merger
class ModelMerger {
    constructor(outbox, ownSymbol) {
        this.outbox = outbox;
        this.ownSymbol = ownSymbol;
    }
    /**
     *
     * @param storage Storage adapter that contains the data.
     * @param model The model from an outbox mutation.
     * @returns The type of operation (INSERT/UPDATE/DELETE)
     */
    async merge(storage, model, modelDefinition) {
        let result;
        const mutationsForModel = await this.outbox.getForModel(storage, model, modelDefinition);
        const isDelete = model._deleted;
        if (mutationsForModel.length === 0) {
            if (isDelete) {
                result = OpType.DELETE;
                await storage.delete(model, undefined, this.ownSymbol);
            }
            else {
                [[, result]] = await storage.save(model, undefined, this.ownSymbol);
            }
        }
        return result;
    }
    async mergePage(storage, modelConstructor, items, modelDefinition) {
        const itemsMap = new Map();
        for (const item of items) {
            // merge items by model id. Latest record for a given id remains.
            const modelId = getIdentifierValue(modelDefinition, item);
            itemsMap.set(modelId, item);
        }
        const page = [...itemsMap.values()];
        return storage.batchSave(modelConstructor, page, this.ownSymbol);
    }
}

export { ModelMerger };
//# sourceMappingURL=merger.mjs.map