Rails 5
Declare a module
module Current
thread_mattr_accessor :user
end
Assign the current user
class ApplicationController < ActionController::Base
around_action :set_current_user
def set_current_user
Current.user = current_user
yield
ensure
# to address the thread variable leak issues in Puma/Thin webserver
Current.user = nil
end
end
Now you can refer to the current user as Current.user
Documentation about thread_mattr_accessor
Rails 3,4
It is not a common practice to access the current_user
within a model. That being said, here is a solution:
class User < ActiveRecord::Base
def self.current
Thread.current[:current_user]
end
def self.current=(usr)
Thread.current[:current_user] = usr
end
end
Set the current_user
attribute in a around_filter
of ApplicationController
.
class ApplicationController < ActionController::Base
around_filter :set_current_user
def set_current_user
User.current = User.find_by_id(session[:user_id])
yield
ensure
# to address the thread variable leak issues in Puma/Thin webserver
User.current = nil
end
end
Set the current_user
after successful authentication:
def login
if User.current=User.authenticate(params[:username], params[:password])
session[:user_id] = User.current.id
flash[:message] = "Successfully logged in "
redirect_to( :action=>'home')
else
flash[:notice] = "Incorrect user/password combination"
redirect_to(:action=>"login")
end
end
Finally, refer to the current_user
in update_history
of Item
.
class Item < ActiveRecord::Base
has_many :histories
after_create :update_history
def update_history
histories.create(:date=>Time.now, :username=> User.current.username)
end
end