如何填充嵌套在 ZCCADCDEDB567ABAE643E15DCF0974E503Z 中的对象数组中的文档？

Question

I want to populate the ingredientsList. Is it possible to get the array back with populated ingredients field? How I can do it, if I want just one object out of ingredientsList with populated ingredient?

Hope you can help:)

My Schema looks like this:

export const RecipeSchema = new Schema({
  name: {
    type: String,
    required: 'Enter a name',
  },
  ingredientsList: [
    {
      ingredient: {
        type: Schema.Types.ObjectId,
        ref: 'Ingredient',
      },
      value: {
        type: Number,
        default: 1,
      },
    },
  ],
});

My Ingredient Model looks like this:

export const IngredientSchema = new Schema({
  name: {
    type: String,
    required: 'Enter a name',
  },

  created_date: {
    type: Date,
    default: Date.now,
  },
  amount: {
    type: Number,
    default: 1,
  },
});

Answer 1

As the field, ingredientsList , is an array of referenced documents from the Ingredient collection - you can use model.populate() as follows:

const recipes = await Recipe.find().populate('ingredientsList');

res.send({ data: orders });

This will return all Recipes and also expand or populate the ingredientsList for each.

Let's say that you only wanted populate the name field of each document in ingredientsList - you do so as follow:

const recipes = await Recipe.find().populate('ingredientsList', 'name');

res.send({ data: orders });

This will return all Recipes but only populate the name field on ingredientsList for each.

Mongoose docs on population