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`yarn add actioncable`

import ActionCable from 'react-native-actioncable'

const cable = ActionCable.createConsumer('ws://localhost:3000/cable');

export default class Room extends Component {
  componentDidMount () {
    this.subscription = cable.subscriptions.create(
      'ChannelName',

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root# apt-get update
root# apt-get upgrade

// dependencies for Ruby
root# apt-get install -y git-core curl zlib1g-dev build-essential libssl-dev libreadline-dev libyaml-dev \
  libsqlite3-dev sqlite3 libxml2-dev libxslt1-dev libcurl4-openssl-dev python-software-properties libffi-dev \
  libpcre3-dev unzip

// Node.js v7
root# curl -sL https://deb.nodesource.com/setup_7.x | sudo -E bash -

ugened47

The common reason for this has something to do with shut down. When you shut down your PC or terminate your console(like Terminal in Mac) with your local server that using pg open, the error will occur.
As this https://stackoverflow.com/a/21420719/10738100 says, first try to remove PID file.

rm /usr/local/var/postgres/postmaster.pid

brew services restart postgresql

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# Ruby CircleCI 2.0 configuration file
#
# Check https://circleci.com/docs/2.0/language-ruby/ for more details

defaults: &defaults
  working_directory: ~/split_app
  parallelism: 2

  docker:
    - image: circleci/ruby:2.5.0-node-browsers

ugened47

/* eslint-disable camelcase */
import React, { Component } from 'react'
import { Image, TouchableOpacity, Text, View } from 'react-native'
import AuthActions from '../Redux/AuthRedux'
import { connect } from 'react-redux'
import FBSDK from 'react-native-fbsdk'

import Styles from './Styles/DrawerContentStyles'

import { DrawerItems } from 'react-navigation'

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upstream puma_<%= fetch(:nginx_config_name) %> { <%
  flags = 'fail_timeout=0'
  @backends = [fetch(:puma_bind)].flatten.map do |m|
  etype, address  = /(tcp|unix|ssl):\/{1,2}(.+)/.match(m).captures
  if etype =='unix'
    "server #{etype}:#{address} #{fetch(:nginx_socket_flags)};"
  else
    "server #{address.gsub(/0\.0\.0\.0(.+)/, "127.0.0.1\\1")} #{fetch(:nginx_http_flags)};"
  end
end

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# Creating app
rails new name

# Start server
rails server (s) [ -b $IP [-p $PORT] ]

# Scaffold (add model)
rails generate scaffold name attribute:type