ruby on rails - Unidentified Method 'id' for nil:NilClass -

i'm trying incorporate amistad (friendship gem) , i'm having trouble.

here controller friendship create..

def create invitee = user.find_by_id(params[:id]) if current_user.invite invitee   redirect_to new_friend_path, :notice => "successfully invited friend!" else   redirect_to new_friend_path, :notice => "sorry! can't invite user!" end end 

i have current_user defined in session helper (with michael hartl's tutorial) as

def current_user remember_token = user.encrypt(cookies[:remember_token]) @current_user ||= user.find_by(remember_token: remember_token) end 

the error getting pointing line of controller

if current_user.invite invitee 

and error states undefined method `id' nil:nilclass

i have tried changing friendship controller's create action

def create invitee = user.find_by_id(params[:id]) if @current_user.invite invitee   redirect_to new_friend_path, :notice => "successfully invited friend!" else   redirect_to new_friend_path, :notice => "sorry! can't invite user!" end end 

once that, seems though amistad's magic forgotten, because 'invite' calls undefined method error.

as can tell, i'm pretty new ror , working on incorporating gems.

i'd appreciate getting work! thanks, peege

the reason getting error because, current_user method of sessionshelper not getting called instead current_user treated local variable.

add include sessionshelper in controller class. so, current_user method accessible controller.

edit

params[:id] nil. change code below:

 <%= link_to 'add friend', friends_path(id: @user.id), :method =>"post", class: "btn btn-default btn-success" %>