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Listing 98 Code for a failed signin attempt
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app/controllers/sessions_controllerrb
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class SessionsController < ApplicationController def create user = Userauthenticate(params[:session][:email], params[:session][:password]) if usernil flashnow[:error] = "Invalid email/password combination"
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4 If case you re wondering why we use user instead of @user in Listing 98, it s because this user variable is never needed in any view, so there is no reason to use an instance variable here (Using @user still works, though)
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Signin Failure
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@title = "Sign in" render 'new' else # Sign the user in and redirect to the user's show page end end end
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Recall from Section 842 that we displayed signup errors using the User model error messages Since the session isn t an Active Record model, this strategy won t work here, so instead we ve put a message in the flash (or, rather, in flashnow; see Box 91) Thanks to the flash message display in the site layout (Listing 816), the flash[:error] message automatically gets displayed; thanks to the Blueprint CSS, it automatically gets nice styling (Figure 95)
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A failed signin (with a flash message)
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9: Sign In, Sign Out
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Box 91 Flash Dot Now
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There s a subtle difference between flash and flashnow The flash variable is designed to be used before a redirect, and it persists on the resulting page for one request---that is, it appears once, and disappears when you click on another link Unfortunately, this means that if we don t redirect, and instead simply render a page (as in Listing 98), the flash message persists for two requests: it appears on the rendered page but is still waiting for a redirect (ie, a second request), and thus appears again if you click a link To avoid this weird behavior, when rendering rather than redirecting we use flashnow instead of flash The flashnow object is specifically designed for displaying flash messages on rendered pages If you ever find yourself wondering why a flash message is showing up where you don t expect it, chances are good that you need to replace flash with flashnow
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93 Signin Success
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Having handled a failed signin, we now need to actually sign a user in A hint of where we re going the user profile page, with modified navigation links is mocked up in Figure 965 Getting there will require some of the most challenging Ruby programming so far in this tutorial, so hang in there through the end and be prepared for a little heavy lifting Happily, the first step is easy completing the Sessions controller create action is a snap Unfortunately, it s also a cheat
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931 The Completed create Action
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Filling in the area now occupied by the signin comment (Listing 98) is simple: upon successful signin, we sign the user in using the sign_in function, and then redirect to the profile page (Listing 99) We see now why this is a cheat: alas, sign_in doesn t currently exist Writing it will occupy the rest of this section
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Listing 99 The completed Sessions controller create action (not yet working)
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app/controllers/sessions_controllerrb
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class SessionsController < ApplicationController def create
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5 Image from http://wwwflickrcom/photos/hermanusbackpackers/3343254977/
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user = Userauthenticate(params[:session][:email], params[:session][:password]) if usernil flashnow[:error] = "Invalid email/password combination" @title = "Sign in" render 'new' else sign_in user redirect_to user end end end
A mockup of the user profile after a successful signin (with updated nav links)
9: Sign In, Sign Out
Even though we lack the sign_in function, we can still write the tests (Listing 910) (We ll fill in the body of the first test in Section 933)
Listing 910 Pending tests for user signin (to be completed in Section 933)
spec/controllers/sessions_controller_specrb
describe SessionsController do describe "POST 'create'" do describe "with valid email and password" do before(:each) do @user = Factory(:user) @attr = { :email => @useremail, :password => @userpassword } end it "should sign the user in" do post :create, :session => @attr # Fill in with tests for a signed-in user end it "should redirect to the user show page" do post :create, :session => @attr responseshould redirect_to(user_path(@user)) end end end end