Refactors the pagination behavior for index actions

app/controllers/api/v1/orders_controller.rb

@@ -4,11 +4,7 @@ class Api::V1::OrdersController < ApplicationController
 
   def index
     orders = current_user.orders.page(params[:page]).per(params[:per_page])
-    render json: orders, meta: { pagination: {
-                                  per_page: params[:per_page],
-                                  total_pages: orders.total_pages,
-                                  total_objects: orders.total_count
-                               } }
+    render json: orders, meta: pagination(orders, params[:per_page])
   end
 
   def show

app/controllers/api/v1/products_controller.rb

@@ -9,12 +9,7 @@ def show
 
   def index
     products = Product.search(params).page(params[:page]).per(params[:per_page])
-    render json: products, meta: { pagination: {
-                                                  per_page: params[:per_page],
-                                                  total_pages: products.total_pages,
-                                                  total_objects: products.total_count
-                                               }
-                                 }
+    render json: products, meta: pagination(products, params[:per_page])
   end
 
   def create

app/controllers/application_controller.rb

@@ -5,4 +5,12 @@ class ApplicationController < ActionController::Base
   protect_from_forgery with: :null_session
 
   include Authenticable
+
+  private
+    def pagination(paginated_array, per_page)
+      { pagination: { per_page: per_page.to_i,
+                      total_pages: paginated_array.total_pages,
+                      total_objects: paginated_array.total_count
+                    } }
+    end
 end

spec/controllers/api/v1/orders_controller_spec.rb

@@ -14,11 +14,7 @@
       expect(order_response.size).to eql(4)
     end
 
-    it { expect(json_response).to have_key(:meta) }
-    it { expect(json_response[:meta]).to have_key(:pagination) }
-    it { expect(json_response[:meta][:pagination]).to have_key(:per_page)}
-    it { expect(json_response[:meta][:pagination]).to have_key(:total_pages) }
-    it { expect(json_response[:meta][:pagination]).to have_key(:total_objects) }
+    it_behaves_like "paginated list"
 
     it { is_expected.to respond_with 200 }
   end

spec/controllers/api/v1/products_controller_spec.rb

@@ -39,12 +39,8 @@
       end
     end
 
-    it { expect(json_response).to have_key(:meta) }
-    it { expect(json_response[:meta]).to have_key(:pagination) }
-    it { expect(json_response[:meta][:pagination]).to have_key(:per_page) }
-    it { expect(json_response[:meta][:pagination]).to have_key(:total_pages) }
-    it { expect(json_response[:meta][:pagination]).to have_key(:total_objects) }
-
+    it_behaves_like "paginated list"
+
     it { is_expected.to respond_with 200 }
 
     context "when product_ids parameter is sent" do

spec/support/shared_examples/pagination.rb

@@ -0,0 +1,7 @@
+shared_examples "paginated list" do
+  it { expect(json_response).to have_key(:meta) }
+  it { expect(json_response[:meta]).to have_key(:pagination) }
+  it { expect(json_response[:meta][:pagination]).to have_key(:per_page)}
+  it { expect(json_response[:meta][:pagination]).to have_key(:total_pages) }
+  it { expect(json_response[:meta][:pagination]).to have_key(:total_objects) }
+end