addToCollection() 不适用于我创建的模型，但适用于预先构建的“用户”模型

如何解决addToCollection() 不适用于我创建的模型，但适用于预先构建的“用户”模型

当我使用 OrganisationalUnit 模型时 await OrganisationalUnit.addToCollection(id,'users',userIds);我收到一个错误

TypeError: OrganisationalUnit.addToCollection is not a function
    at Object.fn (/var/www/html/prime/api/controllers/organisational-units/add-users-to-unit.js:38:30)

但是，当我使用具有相同参数的用户模型时（仅用于测试）

await User.addToCollection(id,'units',userIds); //it saves perfectly!

然后我尝试打印模型本身，结果有所不同：

console.log(OrganisationalUnit) //prints 

{ attributes:
   { name: { type: 'string',required: true,autoMigrations: [Object] },location: { type: 'string',parent: { model: 'OrganisationalUnit',users:
      { collection: 'User',via: 'units',description: 'the units this user manages' } },identity: 'organisationalunit',globalId: 'OrganisationalUnit' }

和

console.log(User) //prints



newConstructor {
  _adapter:
   { identity: 'sails-mongo',adapterApiVersion: 1,defaults: { schema: false },datastores: { default: [Object] },mongodb:
      { [Function]
        MongoError: [Function: MongoError],MongoNetworkError: [Function: MongoNetworkError],MongoTimeoutError: [Function: MongoTimeoutError],MongoServerSelectionError: [Function: MongoServerSelectionError],MongoParseError: [Function: MongoParseError],MongoWriteConcernError: [Function: MongoWriteConcernError],MongoBulkWriteError: [Function: BulkWriteError],BulkWriteError: [Function: BulkWriteError],Admin: [Function: Admin],MongoClient: [Function],Db: [Function],Collection: [Function: Collection],Server: [Function: Server],ReplSet: [Function: ReplSet],Mongos: [Function: Mongos],ReadPreference: [Function],GridStore: [Function],Chunk: [Function],Logger: [Function],AggregationCursor: [Function: AggregationCursor],CommandCursor: [Function: CommandCursor],Cursor: [Function: Cursor],GridFSBucket: [Function],CoreServer: [Function],CoreConnection: [Function: Connection],Binary: [Function],Code: [Function],Map: [Function],DBRef: [Function],Double: [Function],Int32: [Function],Long: [Function],MinKey: [Function],MaxKey: [Function],ObjectID: [Function],ObjectId: [Function],Symbol: [Function],Timestamp: [Function],BSONRegExp: [Function],Decimal128: [Function],connect: [Circular],instrument: [Function] },registerDatastore: [Function: registerDatastore],teardown: [Function: teardown],createManager:
      { friendlyName: 'Create manager',description:
         'Build and initialize a connection manager instance (in Mongo,this is `db`).',moreInfoUrl:
         'https://github.com/node-machine/driver-interface/blob/master/machines/create-manager.js',inputs: [Object],exits: [Object],fn: [Function: fn],identity: 'create-manager',implementationType: 'analog' },destroyManager:
      { friendlyName: 'Destroy manager',description:
         'Destroy the specified connection manager and all of its active connections.',extendedDescription:
         'This may involve destroying a pool and its connections,destroying multiple pools and their connections,doing nothing at all (if this manager just does ad-hoc connections),or something even more exotic.  The implementation is left up to the driver.',sync: true,identity: 'destroy-manager',getConnection:
      { friendlyName: 'Get connection',description:
         'Get an active connection to the database (in Mongo,this is currently a no-op).',moreInfoUrl:
         'https://github.com/node-machine/driver-interface/blob/master/machines/get-connection.js',identity: 'get-connection',releaseConnection:
      { friendlyName: 'Release connection',description: 'Release an active database connection.',extendedDescription:
         'Depending on the implementation of this driver,this might release the connection back into the pool or close it entirely.  Regardless,if the provided connection has a transaction started,be sure to end the transaction by either committing it or rolling it back before releasing the connection.',identity: 'release-connection',verifyModelDef:
      { friendlyName: 'Verify model def',description:
         'Verify that the specified model definition is compatible with this adapter.',extendedDescription:
         'This assumes that the provided model def has already undergone adapter-agnostic normalization,and is considered generally valid.',sideEffects: 'cacheable',identity: 'verify-model-def',create: [Function],createEach: [Function],update: [Function],destroy: [Function],find: [Function],count: [Function],sum: [Function],avg: [Function],define: [Function: define],drop: [Function: drop],definePhysicalModel:
      { friendlyName: 'Define (physical model)',description:
         'Define a physical model (i.e. Mongo collection) with the specified characteristics,creating indexes as needed.',sideEffects: 'idempotent',identity: 'define-physical-model',dropPhysicalModel:
      { friendlyName: 'Drop (physical model)',description:
         'Completely drop & destroy any traces of a particular physical model (i.e. Mongo collection).',identity: 'drop-physical-model',setPhysicalSequence:
      { friendlyName: 'Set physical sequence',description: 'Reset a auto-incrementing sequence to the specified value.',identity: 'set-physical-sequence',implementationType: 'analog' } },_orm:
   { collections:
      { organisationalunit: [newConstructor],user: [Circular],archive: [newConstructor],organisationalunit_users__user_units: [newConstructor] },datastores: {} },waterline:
   { collections:
      { organisationalunit: [newConstructor],_callbacks: {},hasSchema: true,_transformer:
   { _transformations:
      { createdAt: 'createdAt',updatedAt: 'updatedAt',id: '_id',emailAddress: 'emailAddress',emailStatus: 'emailStatus',emailChangeCandidate: 'emailChangeCandidate',password: 'password',fullName: 'fullName',isSuperAdmin: 'isSuperAdmin',passwordResetToken: 'passwordResetToken',passwordResetTokenExpiresAt: 'passwordResetTokenExpiresAt',emailProofToken: 'emailProofToken',emailProofTokenExpiresAt: 'emailProofTokenExpiresAt',stripeCustomerId: 'stripeCustomerId',hasBillingCard: 'hasBillingCard',billingCardBrand: 'billingCardBrand',billingCardLast4: 'billingCardLast4',billingCardExpMonth: 'billingCardExpMonth',billingCardExpYear: 'billingCardExpYear',tosAcceptedByIp: 'tosAcceptedByIp',lastSeenAt: 'lastSeenAt' } },associations:
   [ { alias: 'units',type: 'collection',collection: 'organisationalunit',via: 'users' } ],publish: [Function: wrapper],subscribe: [Function: wrapper],unsubscribe: [Function: wrapper],getRoomName: [Function: getRoomName],_publishRPS: [Function: _publishRPS],_room: [Function: wrapper],_classRoom: [Function: _classRoom],_publishUpdate: [Function: wrapper],_publishDestroy: [Function: wrapper],_publishAdd: [Function: wrapper],_publishRemove: [Function: wrapper],_publishCreate: [Function: wrapper],_publishCreateSingle: [Function: _publishCreateSingle],_watch: [Function: wrapper],_introduce: [Function: wrapper],_retire: [Function: wrapper],autosubscribe: true }

请帮助我是 SailsJs 的新手