how to generate barcode in c# net with example Logging In a User in Font

Printer QR-Code in Font Logging In a User

Logging In a User
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Now we can return to our new actions, starting with login. Here, you ll see the session object action (no pun intended).
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def login if request.post if user = User.authenticate(params[:login], params[:password]) session[:user_id] = user.id redirect_to events_url else flash[:notice] = 'Invalid login/password combination' end end end
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First, we check to see if the request method is of the POST variety, which would indicate that the login form had been posted. If it s a GET, meaning no form data has been posted, we just want to render the login template, which will happen automatically since we re not sending any other response. If we have a POST, though, we use the authenticate class method from our User model to attempt a login (see Listing 5-28 in 5).
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CHAPTER 6 ACTION PACK: WORKING WITH THE VIEW AND THE CONTROLLER
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Remember that authenticate returns a User object if the authentication succeeds; otherwise it returns false. Therefore, we can perform our conditional and our assignment in one shot using if user = User.authenticate(params[:login], params[:password]). If the assignment takes place, we want to store a reference to this user so we can keep the user logged in a perfect job for the session if there ever was one.
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session[:user_id] = user.id
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Notice that we don t need to store the entire User object in session. We store just a reference to the user s id. Why wouldn t we want to store the entire User object Well, think about this for a minute: what if the user is stored in session and then that user later changes her login The old login would remain in the session and would therefore be stale. This can cause further problems if the underlying User model changes. Your entire object could become stale, potentially causing a NoMethodError when accessing attributes that didn t exist on the model at the time it was placed in session. The best bet is to just store the id. With a reference to the logged-in user safely stored in session, we can redirect to the events controller.
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Logging Out a User
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The logout action is fairly straightforward. We clear out the :user_id session by setting its value to nil, and then we redirect back to the login action.
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def logout session[:user_id] = nil redirect_to login_url end
This is a good way to clear out a specific session, but sometimes you want to clear the entire session without having to remember which keys to reset. Rails provides the method reset_session to do just that. We ve done a lot of work on the users controller so far. Listing 6-14 shows what it should look like at this stage.
Listing 6-14. Actions Added in app/controllers/users_controller.rb
class UsersController < ApplicationController def show @user = User.find(params[:id]) end
CHAPTER 6 ACTION PACK: WORKING WITH THE VIEW AND THE CONTROLLER
def new @user = User.new end def create @user = User.new(params[:user]) if @user.save flash[:notice] = 'Thanks for signing up!' redirect_to :controller => 'events', :action => 'index' else render :action => 'new' end end def edit @user = User.find(params[:id]) end def update @user = User.find(params[:id]) if @user.update_attributes(params[:user]) flash[:notice] = 'Information updated' redirect_to :action => 'show', :id => @user.id else render :action => 'edit' end end def login if request.post if user = User.authenticate(params[:login], params[:password]) session[:user_id] = user.id redirect_to :controller => 'events', :action => 'index' else flash[:notice] = 'Invalid login/password combination' end end end
CHAPTER 6 ACTION PACK: WORKING WITH THE VIEW AND THE CONTROLLER
def logout session[:user_id] = nil redirect_to :action => 'login' end end
Improving the Events Controller and Templates
In walking through the construction of the users controller, we ve covered generating controllers, creating templates and layouts, and DRYing up with partials. Now let s take that knowledge and apply it to the events controller (and templates).
Cleaning Up the Events Controller
Currently, our events controller is stock scaffolding. To be sure, scaffolding has its place; it served us quite well as a learning tool. But now it s time to rework the scaffolded version. Open the events controller (app/controllers/events_controller.rb) in your editor. Notice how the scaffolder creates index and list actions. Take a close look, and you ll notice that the index action renders the list template. The two actions are pretty much identical, so there s no need for both of them. Let s make the index action render the list of events, as shown in Listing 6-15.
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