knexfile.js

module.exports = {
  development: {
    client: 'postgresql',
    connection: {
      port: 5432,
      host: 'localhost',
      database: 'knex',
      user: 'knex',
      password: 'password',
    },
    pool: {
      min: process.env.DATABASE_POOL_MIN,
      max: process.env.DATABASE_POOL_MAX,
    },
    migrations: {
      directory: './db/migrations',
      tableName: 'knex_migrations',
    },
    seeds: {
      directory: './db/seeds',
    },
  },

  staging: {
    client: 'postgresql',
    connection: {
      port: process.env.DATABASE_PORT,
      host: process.env.DATABASE_HOST,
      database: process.env.DATABASE_NAME,
      user: process.env.DATABASE_USER,
      password: process.env.DATABASE_ACCESS_KEY,
    },
    pool: {
      min: process.env.DATABASE_POOL_MIN,
      max: process.env.DATABASE_POOL_MAX,
    },
    migrations: {
      directory: './db/migrations',
      tableName: 'knex_migrations',
    },
    seeds: {
      directory: './db/seeds',
    },
  },

  test: {
    client: 'postgresql',
    connection: {
      port: 5432,
      host: 'localhost',
      database: 'knex',
      user: 'knex',
      password: 'password',
    },
    pool: {
      min: process.env.DATABASE_POOL_MIN,
      max: process.env.DATABASE_POOL_MAX,
    },
    migrations: {
      directory: './db/migrations',
      tableName: 'knex_migrations',
    },
    seeds: {
      directory: './db/seeds',
    },
  },

  production: {
    client: 'postgresql',
    connection: {
      port: process.env.DB_PORT,
      host: process.env.DB_HOST,
      database: process.env.DB_NAME,
      user: process.env.DB_USER,
      password: process.env.DB_PASSWORD,
    },
    pool: {
      min: process.env.DATABASE_POOL_MIN,
      max: process.env.DATABASE_POOL_MAX,
    },
    migrations: {
      directory: './db/migrations',
      tableName: 'knex_migrations',
    },
    seeds: {
      directory: './db/seeds',
    },
  }
};