In certain cases puma does not set application root. Moved to set cache_store via config/application.rb.

config/application.rb

@@ -48,7 +48,7 @@ module Zammad
     config.api_path = '/api/v1'
 
     # define cache store
-    config.cache_store = :file_store, "tmp/cache_file_store_#{Rails.env}"
+    config.cache_store = :file_store, "#{Rails.root}/tmp/cache_file_store_#{Rails.env}"
 
     # default preferences by role
     config.preferences_default_by_role = {

config/environments/production.rb

@@ -54,9 +54,6 @@ Rails.application.configure do
   # Use a different logger for distributed setups.
   # config.logger = ActiveSupport::TaggedLogging.new(SyslogLogger.new)
 
-  # Use a different cache store in production.
-  # config.cache_store = :mem_cache_store
-
   # Enable serving of images, stylesheets, and JavaScripts from an asset server.
   # config.action_controller.asset_host = 'http://assets.example.com'
 
@@ -83,7 +80,4 @@ Rails.application.configure do
   # format log
   config.log_formatter = Logger::Formatter.new
 
-  # define cache store
-  config.cache_store = :file_store, 'tmp/cache_file_store_production'
-
 end

lib/cache.rb

@@ -10,8 +10,6 @@ delete a cache
 
   def self.delete(key)
     Rails.cache.delete(key.to_s)
-  rescue => e
-    Rails.logger.error "ERROR: Cache.delete #{e.message}"
   end
 
 =begin
@@ -30,11 +28,7 @@ write a cache
     if !params[:expires_in]
       params[:expires_in] = 7.days
     end
-    begin
     Rails.cache.write(key.to_s, data, params)
-    rescue => e
-      Rails.logger.error "ERROR: Cache.write #{e.message}"
-    end
   end
 
 =begin