JsonMapper's deserializer not removing properties

[LefanTan]

Hi folks,

I'm trying to deserialize a TsED model (RecordingModel) into its prisma/client (Recording) equivalent so that it can be passed into prisma's update().

    // `recording` is of type RecordingModel, but we need to convert it to type Recording
    const prismaRecording = deserialize<Recording>(recording);
    this.logger.info("prismaRecording", prismaRecording);

    const updated = await this.recordingService.update({
      where: { id },
      data: prismaRecording,
    });

However, the logger is telling me that the prismaRecording is still of type RecordingModel which is causing some error since it contained some properties that doesn't exist in the schema. How can I get around this?

Log

[2022-12-29T03:35:57.591] [INFO ] [TSED] - prismaRecording RecordingModel {
  id: 'b5bc5ba7-3616-4908-a9db-2b17cc2bafee',
  title: 'Vento - 29 December 2022',
  encodingStatus: 'DONE',
  videoUrl: 'http://localhost:9199/vento-assets/b5bc5ba7-3616-4908-a9db-2b17cc2bafee.mp4',
  user: null,
  userId: 'xZRUmiTMD8ZUI1ihrPaTQvrfh1M2',
  createdAt: 2022-12-29T10:17:53.848Z,
  updatedAt: 2022-12-29T10:17:55.436Z
}

[Romakita]

Why don’t you use the RecordModel directly…

also you missed to give the type to deserialize recording object. So deserialize function has no effect. Try this:

deserialize(recording, { type: Recording })

see you

[LefanTan]

Thanks for the reply. I couldn't use RecordModel directly because RecordingModel contains additional properties (from the one to many relationship) that doesn't exist in the schema. For example the User property being passed to prisma update will cause it to fail. Using deserialize() to strip off these additional properties would make life a lot easier 😄 .

Lint error when passing RecordingModel to update()'s data property.

(property) data: (Prisma.Without<Prisma.RecordingUpdateInput, Prisma.RecordingUncheckedUpdateInput> & Prisma.RecordingUncheckedUpdateInput) | (Prisma.Without<Prisma.RecordingUncheckedUpdateInput, Prisma.RecordingUpdateInput> & Prisma.RecordingUpdateInput)
The data needed to update a Recording.

Type 'RecordingModel' is not assignable to type '(Without<RecordingUpdateInput, RecordingUncheckedUpdateInput> & RecordingUncheckedUpdateInput) | (Without<...> & RecordingUpdateInput)'.
  Type 'RecordingModel' is not assignable to type 'Without<RecordingUncheckedUpdateInput, RecordingUpdateInput> & RecordingUpdateInput'.

RecordingModel.ts

export declare class RecordingModel implements Recording {
    id: string;
    title: string;
    encodingStatus: ENCODING_STATUS;
    videoUrl: string | null;
    user: UserModel | null;
    userId: string | null;
    createdAt: Date;
    updatedAt: Date;
}

prisma/client/index.d.ts

export type Recording = {
  id: string
  title: string
  encodingStatus: ENCODING_STATUS
  videoUrl: string | null
  userId: string | null
  createdAt: Date
  updatedAt: Date
}

And doing deserialize(recording, { type: Recording }) doesn't seem to work as type is expecting an object/class, and Recording is a type.

[Romakita]

Ok I see. But deserialize isn’t magic. If you don’t give a model, it won’t do anything. The solution is to use Groups decorator on property that you don’t to have for your db.

deserialize(recording, { type: RecordingModel, groups: ["recording"] })

then add @Groups("!recording") on each prop that you don’t wan’t in the database (like user prop).

see you