loopback/lib/builtin-models.js

// Copyright IBM Corp. 2014,2016. All Rights Reserved.
// Node module: loopback
// This file is licensed under the MIT License.
// License text available at https://opensource.org/licenses/MIT

'use strict';

const assert = require('assert');

module.exports = function(registry) {
  // NOTE(bajtos) we must use static require() due to browserify limitations

  registry.KeyValueModel = createModel(
    require('../common/models/key-value-model.json'),
    require('../common/models/key-value-model.js'));

  registry.Email = createModel(
    require('../common/models/email.json'),
    require('../common/models/email.js'));

  registry.Application = createModel(
    require('../common/models/application.json'),
    require('../common/models/application.js'));

  registry.AccessToken = createModel(
    require('../common/models/access-token.json'),
    require('../common/models/access-token.js'));

  registry.User = createModel(
    require('../common/models/user.json'),
    require('../common/models/user.js'));

  registry.RoleMapping = createModel(
    require('../common/models/role-mapping.json'),
    require('../common/models/role-mapping.js'));

  registry.Role = createModel(
    require('../common/models/role.json'),
    require('../common/models/role.js'));

  registry.ACL = createModel(
    require('../common/models/acl.json'),
    require('../common/models/acl.js'));

  registry.Scope = createModel(
    require('../common/models/scope.json'),
    require('../common/models/scope.js'));

  registry.Change = createModel(
    require('../common/models/change.json'),
    require('../common/models/change.js'));

  registry.Checkpoint = createModel(
    require('../common/models/checkpoint.json'),
    require('../common/models/checkpoint.js'));

  function createModel(definitionJson, customizeFn) {
    // Clone the JSON definition to allow applications
    // to modify model settings while not affecting
    // settings of new models created in the local registry
    // of another app.
    // This is needed because require() always returns the same
    // object instance it loaded during the first call.
    definitionJson = cloneDeepJson(definitionJson);

    var Model = registry.createModel(definitionJson);
    customizeFn(Model);
    return Model;
  }
};

// Because we are cloning objects created by JSON.parse,
// the cloning algorithm can stay much simpler than a general-purpose
// "cloneDeep" e.g. from lodash.
function cloneDeepJson(obj) {
  const result = Array.isArray(obj) ? [] : {};
  assert.equal(Object.getPrototypeOf(result), Object.getPrototypeOf(obj));
  for (const key in obj) {
    const value = obj[key];
    if (typeof value === 'object') {
      result[key] = cloneDeepJson(value);
    } else {
      result[key] = value;
    }
  }
  return result;
}