Sequelize, foreign keys as composite primary key

228

Sergio Flores

it is possible to define two foreign keys as a composite primary key of a model?

A user can only be a member of one family, a family can have many members and the family-members table need the references of the user and family

const User = sequelize.define(
    'User',
    {
        id: { type: dataTypes.INTEGER.UNSIGNED, autoIncrement: true, primaryKey: true },
        name: { type: dataTypes.STRING(30) },
        email: { type: dataTypes.STRING(30) }
        ...
    },
    {
        classMethods: {
            associate(models) {
                User.hasOne(models.FamilyMember, {
                    foreignKey: 'user_id'
                }
            }
        }
    }
)

const Family = sequelize.define(
    'Family',
    {
        name: { type: dataTypes.STRING(30) }
    },
    {
        classMethods: {
            associate(models) {
                Family.hasMany(models.FamilyMember, {
                    foreignKey: 'family_id'
                }
            }
        }
    }
)

const FamilyMember = sequelize.define(
    'FamilyMember',
    {
        name: { type: dataTypes.STRING(30) },
        /*
        family_id and user_id will be here after associations but I wanted them to be a composite primaryKey
        */
    }
)

Sergio Flores

In fact, almost I got the solution from documentation:

User = sequelize.define('user', {});
Project = sequelize.define('project', {});
UserProjects = sequelize.define('userProjects', {
    status: DataTypes.STRING
});

User.belongsToMany(Project, { through: UserProjects });
Project.belongsToMany(User, { through: UserProjects });

By default the code above will add projectId and userId to the UserProjects table, and remove any previously defined primary key attribute - the table will be uniquely identified by the combination of the keys of the two tables, and there is no reason to have other PK columns.

Source

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