Sequelize Associate not found

问题

I have a project I'm trying to use sequelize on. It creates the database and tables fine, but it never finds the associate class method, so it never calls the associate method.

This code works fine to create the tables (using the import method) but the Object.keys(db) iterates over each model, but it never finds the associate method.

fs.readdirSync('./models')
    .filter(function (file) {
        return (file.indexOf('.') !== 0) && (file !== 'index.js') && (file.indexOf('.js') > 0) && (file.indexOf('relations.js') !== 0 );
    })


    .forEach(function (file) {
        var model = sequelize.import('../models/' + file);
        db[model.name] = model;
    });

Object.keys(db).forEach(function (modelName) {
        if (db[modelName].associate) {
            db[modelName].associate(db);
            console.log('true');
        }
        else {
            console.log('false');

        }
    }
);

Class Code Example:

module.exports = function (sequelize, DataTypes) {

let userModel = sequelize.define('user', {
    id: {
        type: DataTypes.INTEGER,
        primaryKey: true,
        autoIncrement: true
    },
    email: {
        type: DataTypes.STRING,
        validate: {
            isEmail: true
        },
        allowNull: false
    }
}, {
    classMethods: {
        associate: function (models) {
            let createdByoptions = {
                foreignKey: 'createdByUserID'
            };
            let emailOptions = {
                foreignKey: 'emailAddressID'
            };

            userModel.hasOne(models.user, createdByoptions);
            userModel.hasOne(models.email, emailOptions)

            //userModel.hasMany(models.tenant, {foreignKey: 'id'});

        },
        addUser: function (identityID) {
            userModel.create({identityUserID: identityID});
        }
    }
});


return userModel;

};

回答1:

Sequelize has changed how associations and instance methods are defined, post version >4.

So Associations earlier defined as (for version <4)

const Model = sequelize.define('Model', {
...
}, {
classMethods: {
    associate: function (model) {...}
},
instanceMethods: {
    someMethod: function () { ...}
}
});

Should now be defined as

const Model = sequelize.define('Model', {
...
});

// Class Method
Model.belongsTo(SomeOtherModel);

Check the upgrade guide and docs

来源：https://stackoverflow.com/questions/44938556/sequelize-associate-not-found

标签

node.js

sequelize.js