Answers for "https://sequelize.org/v4/manual/tutorial/upgrade-to-v4.html"

https://sequelize.org/v4/manual/tutorial/upgrade-to-v4.html

const Sequelize = require('sequelize');
  const Promise = require('bluebird');
  const clsBluebird = require('cls-bluebird');
  const cls = require('continuation-local-storage');

  const ns = cls.createNamespace('transaction-namespace');
  clsBluebird(ns, Promise);

  Sequelize.useCLS(ns);

https://sequelize.org/v4/manual/tutorial/upgrade-to-v4.html

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

https://sequelize.org/v4/manual/tutorial/upgrade-to-v4.html

user.addProject(project, { through: { status: 'started' } });

https://sequelize.org/v4/manual/tutorial/upgrade-to-v4.html

pool: {
    idle: 30000,
    min: 20,
    max: 30
  }

https://sequelize.org/v4/manual/tutorial/upgrade-to-v4.html

user.findOne({
  include: {
    model: project,
    include: {
      model: task,
      required: true
    }
  }
});

https://sequelize.org/v4/manual/tutorial/upgrade-to-v4.html

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

// Class Method
Model.associate = function (models) {
    ...associate the models
};

// Instance Method
Model.prototype.someMethod = function () {..}

https://sequelize.org/v4/manual/tutorial/upgrade-to-v4.html

pool: {
    maxIdleTime: 30000,
    minConnections: 20,
    maxConnections: 30
  }

https://sequelize.org/v4/manual/tutorial/upgrade-to-v4.html

$ npm install --save cls-bluebird

https://sequelize.org/v4/manual/tutorial/upgrade-to-v4.html

references: {
    key: '',
    model: ''
  }

https://sequelize.org/v4/manual/tutorial/upgrade-to-v4.html

function propagateRequired(modelDescriptor) {
  let include = modelDescriptor.include;

  if (!include) return false;
  if (!Array.isArray(include)) include = [include];

  return include.reduce((isRequired, descriptor) => {
    const hasRequiredChild = propogateRequired(descriptor);
    if ((descriptor.where || hasRequiredChild) && descriptor.required === undefined) {
      descriptor.required = true;
    }
    return descriptor.required || isRequired;
  }, false);
}

const sequelize = new Sequelize(..., {
  ...,
  define: {
    hooks: {
      beforeFind: propagateRequired
    }
  }
});