Render pagination errors

app/controllers/api/v1/base_controller.rb

@@ -17,6 +17,7 @@ module Api
       rescue_from Exception, with: :error_during_processing
       rescue_from CanCan::AccessDenied, with: :unauthorized
       rescue_from ActiveRecord::RecordNotFound, with: :not_found
+      rescue_from Pagy::VariableError, with: :invalid_pagination
 
       private
 
@@ -49,6 +50,11 @@ module Api
                json: json_api_error(exception.message, backtrace: exception.backtrace)
       end
 
+      def invalid_pagination(exception)
+        render status: :unprocessable_entity,
+               json: json_api_error(exception.message)
+      end
+
       def invalid_resource!(resource = nil)
         render status: :unprocessable_entity,
                json: json_api_invalid(

spec/requests/api/v1/customers_spec.rb

@@ -81,6 +81,17 @@ describe "Customers", type: :request do
         get "/api/v1/customers", params: { page: "2", per_page: "1" }
         expect(json_response_ids).to eq [customer2.id.to_s]
       end
+
+      it "renders beyond the available pages" do
+        get "/api/v1/customers", params: { page: "2" }
+        expect(json_response_ids).to eq []
+      end
+
+      it "informs about invalid pages" do
+        get "/api/v1/customers", params: { page: "0" }
+        expect(json_response_ids).to eq nil
+        expect(json_error_detail).to eq 'expected :page >= 1; got "0"'
+      end
     end
 
     post "Create customer" do