2017-05-09

Client.js

onSubmit(e) {
  e.preventDefault()
  const fd = new FormData()
  fd.append('user[name]', this.state.name)
  fd.append('user[email]', this.state.email)
  fetch('http://example.com/users', {
    method: 'POST',
    body: fd
  }).then(response =>
    response.json()
  ).then((json) => {
    // do something
  }).catch(err =>
    console.log(err)
  )
}

FormData.js

const fb = new FormData()
fb.append('name', 'saitoxu')
fb.append('email', 'saitoxu@example.com')

users_controller.rb

class UsersController < ApplicationController
  def create
    user = User.new(user_params)
    if user.save
      render json: { status: 'success' }
    else
      render json: { status: 'failure' }
    end
  end

  private

  def user_params
    params.require(:user).permit(:name, :email)
  end
end