javascript,ruby-on-rails,ruby,xml,api , Ruby on Rails posting to an API using javascript via a proxy


Ruby on Rails posting to an API using javascript via a proxy

Question:

Tag: javascript,ruby-on-rails,ruby,xml,api

I'm very new to Ruby on Rails and I'm hoping this will be a quick fix. I have a very simple form (firstname, surname, email) that needs to post XML to an API on another domain. Everything on our site is clientside javascript so I would like to post to a proxy within our Rails app to get over the cross-domain issue.

I found this bit of code, that seems to be doing what I want - https://github.com/bitzesty/xml2jsonp but I have no idea how and where to install this in our Ruby app so I can post to it and receive the response.

Any help would be appreciated.


Answer:

Net::HTTP is Ruby's built in library for sending HTTP requests. Rails also has built in features for serializing models to XML.

Lets say you bind your form to a User model:

class User < ActiveModel::Base
  # attr_accessor is not needed if these are real DB columns.
  attr_accessor :firstname
  attr_accessor :surname
  attr_accessor :email
end

And handle the form in UsersController#create

def UsersController < ApplicationController
  # POST `/users`
  def create
    @user = User.new(user_params)
    # @todo send user to remote service.
  end

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

We can then create a service object that posts the user to the remote API

# app/services/user_posting_service
class UserPostingService

  attr_accessor :user
  attr_accessor :client

  # Passing in the client lets us easily stub Net::HTTP in tests
  def initialize(user, client = Net::HTTP)
    @user = user
    @client = client
  end

  def call
    uri = URI('http://www.example.com/user.cgi')
    req = Net::HTTP::Post.new(uri)
    # see http://apidock.com/rails/ActiveRecord/Serialization/to_xml for options.
    req.body = @user.to_xml 

    res = Net::HTTP.start(uri.hostname, uri.port) do |http|
      http.request(req)
    end

    case res
    when Net::HTTPSuccess, Net::HTTPRedirection
      true
    else
      false
    end
  end
end

We can then use the service in our controller:

def UsersController < ApplicationController
  # POST `/users`
  def create
    @user = User.new(user_params)
    @posted = UserPostingService.new(@user).call
    if @posted
      # ... 
    else
       # ... 
    end
  end
  # ...
end

There are several steps which are not included for brevity:

Both of these are pretty basic Rails skills and if you do not know how to get it done you should follow a tutorial or read a book before trying more advanced tasks.


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