Apply automatic rubocop fixes

app/controllers/statistics_controller.rb

@@ -1,8 +1,10 @@
+# frozen_string_literal: true
+
 class StatisticsController < ApplicationController
   include StatisticsHelper
 
-  before_action :authorize!, only: [:show, :graphs, :user_activity, :user_activity_history, :rfc_activity,
-                                    :rfc_activity_history]
+  before_action :authorize!, only: %i[show graphs user_activity user_activity_history rfc_activity
+                                      rfc_activity_history]
 
   def policy_class
     StatisticsPolicy
@@ -15,8 +17,7 @@ class StatisticsController < ApplicationController
     end
   end
 
-  def graphs
-  end
+  def graphs; end
 
   def user_activity
     respond_to do |format|
@@ -27,7 +28,7 @@ class StatisticsController < ApplicationController
   def user_activity_history
     respond_to do |format|
       format.html { render('activity_history', locals: {resource: :user}) }
-      format.json { render_ranged_data :ranged_user_data}
+      format.json { render_ranged_data :ranged_user_data }
     end
   end
 
@@ -46,14 +47,21 @@ class StatisticsController < ApplicationController
 
   def render_ranged_data(data_source)
     interval = params[:interval].to_s.empty? ? 'year' : params[:interval]
-    from = DateTime.strptime(params[:from], '%Y-%m-%d') rescue DateTime.new(0)
-    to = DateTime.strptime(params[:to], '%Y-%m-%d') rescue DateTime.now
-    render(json: self.send(data_source, interval, from, to))
+    from = begin
+      DateTime.strptime(params[:from], '%Y-%m-%d')
+    rescue StandardError
+      DateTime.new(0)
+    end
+    to = begin
+      DateTime.strptime(params[:to], '%Y-%m-%d')
+    rescue StandardError
+      DateTime.now
+    end
+    render(json: send(data_source, interval, from, to))
   end
 
   def authorize!
     authorize self
   end
   private :authorize!
-
 end