diff --git a/app/models/ticket/state.rb b/app/models/ticket/state.rb
index af94bf33c..1b9939ab6 100644
--- a/app/models/ticket/state.rb
+++ b/app/models/ticket/state.rb
@@ -32,7 +32,7 @@ returns:
       )
     elsif category == 'work_on'
       return Ticket::State.where(
-        state_type_id: Ticket::StateType.where( name: ['new', 'open'] )
+        state_type_id: Ticket::StateType.where( name: %w(new open) )
       )
     elsif category == 'work_on_all'
       return Ticket::State.where(
@@ -40,7 +40,7 @@ returns:
       )
     elsif category == 'closed'
       return Ticket::State.where(
-        state_type_id: Ticket::StateType.where( name: ['closed'] )
+        state_type_id: Ticket::StateType.where( name: %w(closed) )
       )
     end
     fail "Unknown category '#{category}'"
diff --git a/lib/stats.rb b/lib/stats.rb
index 7b5e61777..ac5dddd99 100644
--- a/lib/stats.rb
+++ b/lib/stats.rb
@@ -43,9 +43,9 @@ returns
 
     # calculate average
     backend_average_sum = {}
-    user_result.each {|user_id, data|
+    user_result.each {|_user_id, data|
       data.each {|backend_model, backend_result|
-        next if !backend_result.has_key?(:used_for_average)
+        next if !backend_result.key?(:used_for_average)
         if !backend_average_sum[backend_model]
           backend_average_sum[backend_model] = 0
         end
@@ -56,10 +56,10 @@ returns
     # generate average stats
     backend_average_sum.each {|backend_model_average, result|
       average = ( result.to_f / agent_count.to_f ).round(1)
-      user_result.each {|user_id, data|
+      user_result.each {|_user_id, data|
         data.each {|backend_model_data, backend_result|
           next if backend_model_data != backend_model_average
-          next if !backend_result.has_key?(:used_for_average)
+          next if !backend_result.key?(:used_for_average)
           backend_result[:average_per_agent] = average
         }
       }
diff --git a/lib/stats/ticket_in_process.rb b/lib/stats/ticket_in_process.rb
index aaa7ecb96..a17270b11 100644
--- a/lib/stats/ticket_in_process.rb
+++ b/lib/stats/ticket_in_process.rb
@@ -20,14 +20,14 @@ class Stats::TicketInProcess
     closed_state_ids = Ticket::State.by_category('closed').map(&:id)
     closed_ticket_ids = Ticket.select('id').where(
       'owner_id = ? AND state_id IN (?) AND close_time > ?',
-      user.id, closed_state_ids, Time.zone.now-1.day
+      user.id, closed_state_ids, Time.zone.now - 1.day
     ).limit(100).map(&:id)
 
     # get all tickets which I changed to pending action
     pending_action_state_ids = Ticket::State.by_category('pending_action').map(&:id)
     pending_action_ticket_ids = Ticket.select('id').where(
       'owner_id = ? AND state_id IN (?) AND updated_at > ?',
-      user.id, pending_action_state_ids, Time.zone.now-1.day
+      user.id, pending_action_state_ids, Time.zone.now - 1.day
     ).limit(100).map(&:id)
 
     all_ticket_ids = own_ticket_ids.concat(closed_ticket_ids).concat(pending_action_ticket_ids).uniq