CODEWITHSUNDEEP
javascriptsequelize.js
Jérémie Chazelle
Jérémie Chazelle

Reputation: 1818

Limit on belongsToMany association with Sequelize

I would like to know, how can I set a limit on my belongsToMany relations. I try to add limit, but I have this error :

"message": "Only HasMany associations support include.separate",

I have 2 tables :

| peoples (id, code) 
| people-friends (fk_user_id, fk_friend_id) // fk_friend_id is an id from user

My request :

    await db.People.findAll({
    where: {
    id: parent.dataValues.id,
    },
    include: [
    {
        model: db.People,
        as: "Friends",
        limit: 2, // <--- LIMIT
    },
    ],
})

People model :

People.associate = (models) => {
    // People relations
    models.People.belongsToMany(models.People, {
        as: "Friends",
        through: models.PeopleFriend,
        foreignKey: "fk_user_id",
        otherKey: "fk_friend_id",
    })
}

Upvotes: 1

Views: 1076

Answers (1)

Anatoly
Anatoly

Reputation: 22803

If you wish to get a certain user's friends limited by 2 friends (which ones? You have to add an order option) you can query PeopleFriend including People model like this:

await db.PeopleFriend.findAll({
    where: {
      fk_user_id: parent.dataValues.id
    },
    limit: 2, // <--- LIMIT
    order: [['Friend', 'name', 'asc']],
    include: [
    {
        model: db.People,
        as: "Friend",
    },
    {
        model: db.People,
        as: "User",
    },
    ],
})

Don't forget to add associations from PeopleFriend to both People links.

Upvotes: 1

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