Export a single model and related models?

[superlou]

It looks like the export function will export the entire local-storage database. Is there a way to serialize only a specific model and its relationships?

Since the add-on serializer extends JSONAPISerializer, I expected it to include the related models data, but it only appears to include the related IDs and model names.

[superlou]

I think I figured out how to export a single model and its relationships by putting all the related records into the root data attribute.

  createImportableJson(model) {
    let json = model.serialize({ includeId: true });
    json.data = [json.data];
    
    let related = model.children;
    json.data = json.data.concat(related.map(
      (model) => model.serialize({ includeId: true }).data
    ));
    
    return json;
  }

This imports, however it looks like it deletes everything in the storage except for what was imported. Is there a way to have it add and/or overwrite, rather than start from scratch?

Edit: That might be as simple as setting {truncate: false} in the import options. Are there any side-effects of that I might be missing?

[fsmanuel]

Hey @superlou you are right. truncate: false is the option you are looking for. If set to true it will wipe out all records for record types that are included in the import:

ember-local-storage/addon/helpers/import-export.js

Lines 22 to 40 in aa1f837

	if (options.truncate) {
	content.data.forEach((record) => {
	truncateTypes.addObject(record.type);
	});
	truncateTypes.forEach((type) => {
	const singularType = singularize(type);
	const adapter = store.adapterFor(singularType);
	adapter._getIndex(type).forEach((storageKey) => {
	delete get(adapter, '_storage')[storageKey];
	});
	adapter._getIndex(type).reset();
	// unload from store
	store.unloadAll(singularType);
	});
	}

[superlou]

Thanks. This is working, but would it make sense to leave this open as a feature request (export a single model or subset of the records)? Otherwise, I guess it can be closed.