how to reference nested documents in nestjs mongoose typescript

Question

I'm new with nestjs. I use @nestjs/mongoose and I need to reference several fields in a nested object in my class schema and I don't know how to do it.

The dietDays object must contain a date field and meals object that contain a 2 references to Meal schema.

What is the correct way to do it?

The code below shows how I tried to do it, as well as, the other way I tried was that create dietDays class and pass it to Prop type variable but in that scenario I am not able to reference to Meal schema because that was not a schema.

@Schema()
export class Diet {
  @Prop({ default: ObjectID })
  _id: ObjectID 

  @Prop()
  dietDays: [
    {
      date: string
      meals: {
        breakfast: { type: Types.ObjectId; ref: 'Meal' }
        lunch: { type: Types.ObjectId; ref: 'Meal' }
      }
    },
  ]
}

Falyoun · Accepted Answer · 2021-04-27 11:41:54Z

2

You should do it as following:

Create a class which refers to each day in the diet ( logically make sense )

@Schema()
export class DayInDiet {
  @Prop() date: string;
  @Prop()
  meals:
    {
        breakfast: { type: Types.ObjectId, ref: 'breakfast' }
        launch: { type: Types.ObjectId, ref: 'launch' }
    }
}

Knowing that each of which breakfast and lunch should be a valid mongo schemas.

If breakfast and lunch are not schemas, and you have a list of content you can pass this array as possible options for them inside the schema object.

Another possible way

@Schema()
export class DayInDiet {
  @Prop() date: string;
  @Prop()
  meals: [
     { type: Types.ObjectId, ref: 'meal' } // note that meal should be the name of your schema
  ]
}

@Schema()
export class Meal {
  @Prop() name: string;
  @Prop() type: 'launch' | 'breakfast'
}

simple note you are not required to make _id a prop of any schema

Edit

For the diet schema

@Schema()
export class Diet {
  // list of props
 // ...
  @Prop()
  dietDays: [
    { type: Types.ObjectId, ref: 'DayInDiet' }
  ]
}

edited Apr 27, 2021 at 11:41

answered Apr 27, 2021 at 10:38

Falyoun

4,0114 gold badges21 silver badges52 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

soheib Over a year ago

thank you for your answer, but i'm little bit confused about Diet schema that should contain array of diet days (according to your answer DayInDiet). how do I use DayInDiet schema in my Diet schema? and thanks again :))

Falyoun Over a year ago

@soheib I've edited the answer according to final Diet schema

Collectives™ on Stack Overflow

how to reference nested documents in nestjs mongoose typescript

1 Answer 1

Edit

2 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Edit

2 Comments

Your Answer

Sign up or log in

Post as a guest

Related