NestJS service does not support DTO functionality

In my situation, I am using a DTO that looks like this:

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

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

I also have a method named create. UPDATE: This method is located in the plotService and it accepts the above mentioned dto.

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

Everything was working smoothly until recently when an error started occurring:

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'.

My suspicion is that the problem lies within either "sequelize": "^6.16.2" or "sequelize-typescript": "^2.1.3". Any ideas on how to resolve this issue?

typescriptsequelize.jsnestjs

Answer №1

I encountered a similar issue while using the versions ("sequelize": "^6.16.2" or "sequelize-typescript": "^2.1.3"). It seems like there may be an issue with either of these two versions. However, I found a workaround that involves the following steps:

  1. Ensure your model is defined as shown below:
@Table
export class Plot extends Model<Plot> {
    ...
}

(pay attention to the <Plot> part).

  1. Convert your DTO instance to the actual model type:
async createPlot(plot: CreatePlotDTO) {
    return this.plotModel.create(plot as Plot)
}

(note the as Plot part).

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