Sanitise pagination input for new API

app/controllers/concerns/json_api_pagination.rb

@@ -53,7 +53,7 @@ module JsonApiPagination
   end
 
   def current_page
-    params[:page] || 1
+    (params[:page] || 1).to_i
   end
 
   def total_pages

spec/requests/api/v1/customers_spec.rb

@@ -73,11 +73,14 @@ describe "Customers", type: :request do
 
     describe "pagination" do
       it "renders the first page" do
-        pending "pagination logic compares string with integer"
-
         get "/api/v1/customers", params: { page: "1" }
         expect(json_response_ids).to eq [customer1.id.to_s, customer2.id.to_s]
       end
+
+      it "renders the second page" do
+        get "/api/v1/customers", params: { page: "2", per_page: "1" }
+        expect(json_response_ids).to eq [customer2.id.to_s]
+      end
     end
 
     post "Create customer" do