Error: Dialect needs to be explicitly supplied as of v4.0.0 - being thrown even though mysql is supplied in two files

What you are doing?

______
// index.js
if (config.use_env_variable) {
    var sequelize = new Sequelize(process.env[config.use_env_variable]);
} else {
    var sequelize = new Sequelize('burger_shop_DB', 'root', 'hoist', {
        host: "127.0.0.1",
        dialect: 'mysql',
        define: {
            timestamps: false
        }
    });
//config.json
 "production": {
        "use_env_variable" : "JAWS_URL",
        "dialect": "mysql"
    }
}

}

preface:

zobri@LAPTOP-OKM3KH21 MINGW64 ~/UAbcProjects/sequelizedBurger (master) $ sequelize -v Sequelize [Node: 6.11.1, CLI: 2.7.0, ORM: 4.4.2]

What do you expect to happen?

I’m trying to host my sequelize app on Heroku

What is actually happening?

/app/node_modules/sequelize/lib/sequelize.js:169 Aug 05 22:09:54 seq-eat-da-burga app/web.1: throw new Error(‘Dialect needs to be explicitly supplied as of v4.0.0’); Aug 05 22:09:54 seq-eat-da-burga app/web.1: ^ Aug 05 22:09:54 seq-eat-da-burga app/web.1: Error: Dialect needs to be explicitly supplied as of v4.0.0
at new Sequelize (/app/node_modules/sequelize/lib/sequelize.js:169:13) at Object.<anonymous> (/app/models/index.js:12:21)

Reference my index.js snippet above, where MySQL is implicitly stored as dialect

I noticed you closed a similar issue 5 days ago, which stumped the heck out of me while trying to debug - any guidance would be greatly appreciated.

[yassin-mokni]

face the same issue and fixed it by setting the NODE_ENV to the specified environment in the config.json

[sergiyvoytovych]

Check your config file (env names)

{
  development: {
    username: 'root',
    password: null,
    database: 'database_development',
    host: '127.0.0.1',
    dialect: 'mysql'
  },
  test: {
    username: 'root',
    password: null,
    database: 'database_test',
    host: '127.0.0.1',
    dialect: 'mysql'
  },
  production: {
    username: 'root',
    password: null,
    database: 'database_production',
    host: '127.0.0.1',
    dialect: 'mysql'
  }
}