DTO not working when used in service nestJS

Issue

I have a DTO like

export class CreatePlotDTO {
  @IsNumber()
  @ApiProperty()
  @IsOptional()
  area: number;

  @IsNumber()
  @ApiProperty()
  @IsOptional()
  ownerID: number;

}

and a create method UPDATE: this is in the plotService and accepting the dto above

async createPlot(plot: CreatePlotDTO) {
  return this.plotModel.create(plot)
}

This has been working for the longest time but now is failing with this error

Argument of type 'CreatePlotDTO' is not assignable to parameter of type 'CreationAttributes<Plot>'.
      Type 'CreatePlotDTO' is not assignable to type 'Omit<any, string>'.
        Index signature is missing in type 'CreatePlotDTO'.

I suspect the issue is with either "sequelize": "^6.16.2" or "sequelize-typescript": "^2.1.3". Any ideas to resolve this?

Solution

It was happening to me also with the same versions ("sequelize": "^6.16.2" or "sequelize-typescript": "^2.1.3"). I suspect there's something going on with one of those two, but as a workaround, I did something like the following:

1. Define your model like this:

@Table
export class Plot extends Model<Plot> {
    ...
}

(notice the <Plot> part).

2. Cast your DTO instance into the actual model type:

async createPlot(plot: CreatePlotDTO) {
    return this.plotModel.create(plot as Plot)
}

(notice the as Plot part).

Answered By - aleclara95