@loopback/repository
Version:
Define and implement a common set of interfaces for interacting with databases
51 lines • 2.7 kB
JavaScript
;
// Copyright IBM Corp. and LoopBack contributors 2017,2020. All Rights Reserved.
// Node module: @loopback/repository
// This file is licensed under the MIT License.
// License text available at https://opensource.org/licenses/MIT
Object.defineProperty(exports, "__esModule", { value: true });
exports.ModelMetadataHelper = void 0;
const core_1 = require("@loopback/core");
const model_1 = require("../model");
const relations_1 = require("../relations");
const model_decorator_1 = require("./model.decorator");
class ModelMetadataHelper {
/**
* A utility function to simplify retrieving metadata from a target model and
* its properties.
* @param target - The class from which to retrieve metadata.
* @param options - An options object for the MetadataInspector to customize
* the output of the metadata retrieval functions.
*/
static getModelMetadata(target, options) {
const classDef = core_1.MetadataInspector.getClassMetadata(model_decorator_1.MODEL_WITH_PROPERTIES_KEY, target,
// https://github.com/loopbackio/loopback-next/issues/4721
// The `target` can be a subclass for a base model
{ ...options, ownMetadataOnly: true });
// Return the cached value, if it exists.
// XXX(kjdelisle): If we're going to support dynamic updates, then this
// will be problematic in the future, since it will never update.
if (classDef) {
return classDef;
}
else {
const modelMeta = core_1.MetadataInspector.getClassMetadata(model_decorator_1.MODEL_KEY, target, options);
if (!modelMeta) {
return {};
}
else {
// sets the metadata to a dedicated key if cached value does not exist
// set ModelDefinition properties if they don't already exist
const meta = new model_1.ModelDefinition({ ...modelMeta });
// set properties lost from creating instance of ModelDefinition
Object.assign(meta, modelMeta);
meta.properties = Object.assign(meta.properties, core_1.MetadataInspector.getAllPropertyMetadata(model_decorator_1.MODEL_PROPERTIES_KEY, target.prototype, options));
meta.relations = Object.assign(meta.relations, core_1.MetadataInspector.getAllPropertyMetadata(relations_1.RELATIONS_KEY, target.prototype, options));
core_1.MetadataInspector.defineMetadata(model_decorator_1.MODEL_WITH_PROPERTIES_KEY.key, meta, target);
return meta;
}
}
}
}
exports.ModelMetadataHelper = ModelMetadataHelper;
//# sourceMappingURL=metadata.js.map