Moving the authenticate method into the Sessions helper in Java

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Listing 1123 Moving the authenticate method into the Sessions helper
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app/helpers/sessions_helperrb
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module SessionsHelper def authenticate deny_access unless signed_in end
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12 We noted in Section 932 that helper methods are available only in views by default, but we arranged for the Sessions helper methods to be available in the controllers as well by adding include SessionsHelper to the Application controller (Listing 911)
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11: User Microposts
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def deny_access store_location redirect_to signin_path, :notice => "Please sign in to access this page" end end
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(To avoid code repetition, you should also remove authenticate from the Users controller at this time) With the code in Listing 1123, the authenticate method is now available in the Microposts controller, which means that we can restrict access to the create and destroy actions with the before filter shown in Listing 1124 (Since we didn t generate it at the command line, you will have to create the Microposts controller file by hand)
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Listing 1124 Adding authentication to the Microposts controller actions
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app/controllers/microposts_controllerrb
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class MicropostsController < ApplicationController before_filter :authenticate def create end def destroy end end
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Note that we haven t restricted the actions the before filter applies to, since presently it applies to them both If we were to add, say, an index action accessible even to non-signed-in users, we would need to specify the protected actions explicitly:
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class MicropostsController < ApplicationController before_filter :authenticate, :only => [:create, :destroy] def create end def destroy end end
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Manipulating Microposts
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1132 Creating Microposts
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In 8, we implemented user signup by making an HTML form that issued an HTTP POST request to the create action in the Users controller The implementation of micropost creation is similar; the main difference is that, rather than using a separate page at /microposts/new, we will (following Twitter s convention) put the form on the Home page itself (ie, the root path /), as mocked up in Figure 119 When we last left the Home page, it appeared as in Figure 57 that is, it had a big, fat Sign up now! button in the middle Since a micropost creation form only makes sense in the context of a particular signed-in user, one goal of this section will be to serve different versions of the Home page depending on a visitor s signin status We ll implement this in Listing 1127, but for now the only implication is that the tests for the
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A mockup of the Home page with a form for creating microposts
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11: User Microposts
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Microposts controller create action should sign a (factory) user in before attempting to make a post With that caveat in mind, the micropost creation tests parallel those for user creation from Listing 86 and Listing 814; the result appears in Listing 1125
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Listing 1125 Tests for the Microposts controller create action
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spec/controllers/microposts_controller_specrb
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require 'spec_helper' describe MicropostsController do describe "POST 'create'" do before(:each) do @user = test_sign_in(Factory(:user)) end describe "failure" do before(:each) do @attr = { :content => "" } end it "should not create a micropost" do lambda do post :create, :micropost => @attr endshould_not change(Micropost, :count) end it "should render the home page" do post :create, :micropost => @attr responseshould render_template('pages/home') end end describe "success" do before(:each) do @attr = { :content => "Lorem ipsum" } end it "should create a micropost" do lambda do post :create, :micropost => @attr
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endshould change(Micropost, :count)by(1) end it "should redirect to the home page" do post :create, :micropost => @attr responseshould redirect_to(root_path) end
it "should have a flash message" do post :create, :micropost => @attr flash[:success]should = /micropost created/i end end end end
The create action for microposts is similar to its user analogue (Listing 815); the principal difference lies in using the user/micropost association to build the new micropost, as seen in Listing 1126
Listing 1126 The Microposts controller create action
app/controllers/microposts_controllerrb
class MicropostsController < ApplicationController def create @micropost = current_usermicropostsbuild(params[:micropost]) if @micropostsave flash[:success] = "Micropost created!" redirect_to root_path else render 'pages/home' end end end
At this point, the tests in Listing 1125 should all be passing, but of course we still don t have a form to create microposts We can rectify this with Listing 1127, which serves up different HTML based on whether the site visitor is signed in or not
Listing 1127 Adding microposts creation to the Home page (/)