hasMany returning a object with null fields when no data on the related table

What you are doing?

When doing a query that include a relation to another table (hasMany) when there is no data in the related table return an array with a object with all the fields null.

Product = sequalize.define('product', {
    id: {
      type: DataTypes.INTEGER,
      primaryKey: true,
      autoIncrement: true,
    },
    name: {
      type: DataTypes.STRING,
      validate: {
        notNull: true,
        notEmpty: true,
      },
    },
    state: {
      type: DataTypes.ENUM('published', 'pending', 'draft', 'deleted'),
    }
});

ProductFeature = sequalize.define('product_feature', {
    name: {
      type: DataTypes.STRING,
    },
    description: {
      type: DataTypes.STRING,
    }
});

Product.hasMany(ProductFeature,
    {
      foreignKey: 'id_product',
      as: 'features',
    }
  );


// In another File
Product.findAll({
    where: {
      state: 'published',
    },
    order: [
      ['creation_date', 'DESC'],
    ],
    include: [
      {
        model: ProductFeature,
        as: 'features',
      }, // load all pictures
    ],
  })

What do you expect to happen?

Return an array of products, each with an array of features

What is actually happening?

The array of product is returned but when the product dont have feature the features field is an array with one eleiemet with null on all the fields of the feature

"features": [
      {
        "name": null,
        "description": null,
        "id_product": null
      }
    ]

Output, either JSON or SQL

Dialect: Mysql Database version: mysql Ver 14.14 Distrib 5.7.12, for Linux (x86_64) Sequelize version: 3.23.6

[ratulSharker]

I’ve got the same problem. I deliberately removed id from model using Model.removeAttribute('id'). I don’t need any primary key for that model. Why removing the primary key id causing this issue ?

[dr-miracle]

If someone still interested in this problem, add “where” in “include”, but in same level as “through” in findAll options:

const fooSample = await Foo.findAll({
    include: [{
        model: Bar,
        where: {},
        through: {
            where: {
                //your search params
            }
        },
    }]
});