adds users api controller

app/controllers/api/v1/users_controller.rb

@@ -1,24 +1,27 @@
 class Api::V1::UsersController < ApplicationController
 
+  rescue_from User::AlreadyPurchasedError, with: :render_method_not_allowed
+  rescue_from ActiveRecord::RecordNotFound, with: :render_not_found_response
+
+  def render_not_found_response(exception)
+    render json: { error: exception.message }, status: :not_found
+  end
+
+  def render_method_not_allowed(exception)
+    render json: { error: exception.message }, status: 405
+  end
+
   # POST /api/v1/users/:id/purchase
-  # {
-  #   "content_id": 1,
-  #   "content_type": "Movie",
-  #   "purchase_option": 
-  #     {
-  #       "price": 2.99,
-  #       "video_quality": "HD"
-  #     }
-  # }
+  # Params: { "purchase_option_id": 1 }
   def purchase
-    # build content = params[:content_tipe].classify.find(params[:content_id])
-    # check if content is not in user's library
-    # build purchase w/options
-    # po = PurchaseOption.create(params[:purchase_option])
+    # todo: before_action
+    purchase_option = PurchaseOption.find(params[:purchase_option_id])
+    User.find(params[:id]).purchase(purchase_option)
+    render status: 200
   end
 
   # GET /api/v1/users/:id/purchases
   def purchases
-    render json: User.find(params[:id]).library.sort_by(&:remaining_time)
+    render json: User.find(params[:id]).library
   end
 end