Error while saving data in nestjs mongoose

Question

I have a post schema:

@Schema({ timestamps: true })
class PostDocument extends Document {
    @Prop()
    title: string;

    @Prop({ type: MongooseSchema.Types.ObjectId, ref: 'Category' })
    categoryName: Category

}

And when I am trying to save the data, I am getting error:

cast to objectid failed for value type string

Request data:

title: "Test"
categoryName: "test"

Answer 1

Based on the error message you've provided, it looks like you've added an ObjectId type to the categoryName field in your Mongoose schema. However, you are trying to save a string value to this field. To resolve this issue, you can either change the field type annotation to string type, or pass a valid ObjectId to the categoryName field.

@Schema({ timestamps: true })
class PostDocument extends Document {
    @Prop()
    title: string;

    @Prop()
    categoryName: string
}

// data: { title: "Test", categoryName: "test" }

OR

@Schema({ timestamps: true })
class PostDocument extends Document {
    @Prop()
    title: string;

    @Prop({ type: Types.ObjectId, ref: 'Category' })
    categoryId: Types.ObjectId

}

// data: { title: "Test", categoryId: category.id }