Create Api::BaseController to allow use of ActiveModelSerializers

Also add index action to Api::CustomersController

app/controllers/api/base_controller.rb

@@ -0,0 +1,13 @@
+# Base controller for OFN's API
+# Includes the minimum machinery required by ActiveModelSerializers
+module Api
+  class BaseController < Spree::Api::BaseController
+    # Need to include these because Spree::Api::BaseContoller inherits
+    # from ActionController::Metal rather than ActionController::Base
+    # and they are required by ActiveModelSerializers
+    include ActionController::Serialization
+    include ActionController::UrlFor
+    include Rails.application.routes.url_helpers
+    use_renderers :json
+  end
+end

app/controllers/api/customers_controller.rb

@@ -1,13 +1,16 @@
 module Api
-  class CustomersController < Spree::Api::BaseController
-    respond_to :json
+  class CustomersController < BaseController
+    def index
+      @customers = current_api_user.customers
+      render json: @customers, each_serializer: CustomerSerializer
+    end
 
     def update
       @customer = Customer.find(params[:id])
       authorize! :update, @customer
 
       if @customer.update_attributes(params[:customer])
-        render text: @customer.id, :status => 200
+        render json: @customer, serializer: CustomerSerializer, status: 200
       else
         invalid_resource!(@customer)
       end

app/controllers/api/statuses_controller.rb

@@ -1,5 +1,5 @@
 module Api
-  class StatusesController < BaseController
+  class StatusesController < ::BaseController
     respond_to :json
 
     def job_queue