libr-2/app/controllers/api/v1/posts_controller.rb

class Api::V1::PostsController < ApplicationController

  skip_before_action :verify_authenticity_token
  before_action :authenticate_user_from_token
  before_action :permit_params, only: [:create]

  POST_TYPE = {
    :ARTICLE => 'article',
    :WEB_PAGE => 'webpage'
  }

  def create
    post = get_post
    @share_instance = @current_user.share_instances.create sharable: post, description: params[:description]
    render json: @share_instance.to_json(include: :sharable)
  end

  def show
  end

  def index

  end

  private

  def permit_params
    params.permit(:url, :type, :description)
  end

  def get_post
    post = nil
    case params[:type]
      when POST_TYPE[:ARTICLE]
        post = Article.find_or_create_by(url: params[:url])
      when POST_TYPE[:WEB_PAGE]
        post = WebPage.find_or_create_by(url: params[:url])
    end
    post
  end
end