# Integrate Rails callbacks into existing parts of Redmine



# in init.rb file
# ---------------

~~~ ruby
require 'redmine'

# Patches to the Redmine core.
require 'dispatcher'

Dispatcher.to_prepare :redmine_kanban do
  require_dependency 'issue'
  # Guards against including the module multiple time (like in tests)
  # and registering multiple callbacks
  unless Issue.included_modules.include? RedmineKanban::IssuePatch
    Issue.send(:include, RedmineKanban::IsstuePatch)
  end
end
~~~


#  in patch file
# --------------

~~~ ruby
module IssuePatch
	def self.included(base) # :nodoc:
		base.extend(ClassMethods)

		base.send(:include, InstanceMethods)

		# Same as typing in the class
		base.class_eval do
		unloadable # Send unloadable so it will not be unloaded in development

		after_save :update_kanban_from_issue
		after_destroy :remove_kanban_issues

		# Add visible to Redmine 0.8.x
		unless respond_to?(:visible)
		  named_scope :visible, lambda {|*args| { :include => :project,
		      :conditions => Project.allowed_to_condition(args.first || User.current, :view_issues) } }
		end
	end
end
~~~