knexfile.js

require('dotenv').config();

const localPgConnection = {
  host: 'localhost',
  database: 'my_db',
  user: 'username',
  password: 'password'
};

const prodDbConnection = process.env.DATABASE_URL || localPgConnection;

module.exports = {
  development: {
    client: 'sqlite3',
    useNullAsDefault: true,
    connection: {
      filename: './src/database/dev.sqlite3'
    },
    migrations: {
      directory: './src/database/migrations'
    },
    seeds: {
      directory: './src/database/seeds'
    }
  },

  testing: {
    client: 'sqlite3',
    useNullAsDefault: true,
    connection: {
      filename: './src/database/test.sqlite3'
    },
    migrations: {
      directory: './src/database/migrations'
    },
    seeds: {
      directory: './src/database/seeds'
    }
  },
  production: {
    client: 'pg',
    connection: prodDbConnection,
    migrations: {
      directory: './src/database/migrations'
    },
    seeds: {
      directory: './src/database/seeds'
    }
  }
};