A partial for showing a single micropost in Java

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Listing 1138 A partial for showing a single micropost
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app/views/microposts/_microposthtmlerb
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<tr> <td class="micropost"> <span class="content"><%= micropostcontent %></span> <span class="timestamp"> Posted <%= time_ago_in_words(micropostcreated_at) %> ago
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Manipulating Microposts
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</span> </td> <% if current_user (micropostuser) %> <td> <%= link_to "delete", micropost, :method => :delete, :confirm => "You sure ", :title => micropostcontent %> </td> <% end %> </tr>
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Note: As of the latest version of Rails 30, I and several other readers sometimes encounter a strange bug, whereby the micropostuser association isn t made properly The result
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A mockup of the proto-feed with micropost delete links
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11: User Microposts
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is that calling micropostuser raises a NoMethodError exception Until this Rails bug is fixed, as a workaround you can replace the line
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<% if current_user (micropostuser) %>
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with the lines
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<% user = micropostuser rescue Userfind(micropostuser_id) %> <% if current_user (user) %>
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When the call to micropostuser raises an exception, this code finds the user based on the micropost s user_id The tests for the destroy action are straightforward generalizations of the similar tests for destroying users (Listing 1040), as seen in Listing 1139
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Listing 1139 Tests for the Microposts controller destroy action
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spec/controllers/microposts_controller_specrb
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describe MicropostsController do describe "DELETE 'destroy'" do describe "for an unauthorized user" do before(:each) do @user = Factory(:user) wrong_user = Factory(:user, :email => Factorynext(:email)) test_sign_in(wrong_user) @micropost = Factory(:micropost, :user => @user) end it "should deny access" do delete :destroy, :id => @micropost responseshould redirect_to(root_path) end end describe "for an authorized user" do before(:each) do @user = test_sign_in(Factory(:user))
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@micropost = Factory(:micropost, :user => @user) end
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it "should destroy the micropost" do lambda do delete :destroy, :id => @micropost endshould change(Micropost, :count)by(-1) end end end end
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The application code is also analogous to the user case in Listing 1041; the main difference is that, rather than using an admin_user before filter, in the case of microposts we have an authorized_user before filter to check that the current user is the micropost s user The code appears in Listing 1140, and the result of destroying the second-most-recent post appears in Figure 1116
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The user home page after deleting the second-most-recent micropost
Listing 1140 The Microposts controller destroy action
11: User Microposts
app/controllers/microposts_controllerrb
class MicropostsController < ApplicationController before_filter :authenticate, :only => [:create, :destroy] before_filter :authorized_user, :only => :destroy def destroy @micropostdestroy redirect_back_or root_path end private def authorized_user @micropost = Micropostfind(params[:id]) redirect_to root_path unless current_user (@micropostuser) end end
1135 Testing the New Home Page
Before leaving micropost creation and destruction, we ll write some RSpec integration specs to test that our forms are working properly As in the case of users (Section 84), we start by generating a microposts integration spec:
$ rails generate integration_test microposts
Tests for failed and successful micropost creation appear in Listing 1141
Listing 1141 An integration test for the microposts on the home page
spec/requests/microposts_specrb
require 'spec_helper' describe "Microposts" do before(:each) do user = Factory(:user) visit signin_path fill_in :email, :with => useremail
Conclusion
fill_in :password, :with => userpassword click_button end describe "creation" do describe "failure" do it "should not make a new micropost" do lambda do visit root_path fill_in :micropost_content, :with => "" click_button responseshould render_template('pages/home') responseshould have_selector("div#error_explanation") endshould_not change(Micropost, :count) end end describe "success" do it "should make a new micropost" do content = "Lorem ipsum dolor sit amet" lambda do visit root_path fill_in :micropost_content, :with => content click_button responseshould have_selector("spancontent", :content => content) endshould change(Micropost, :count)by(1) end end end end
Having finished testing the micropost functionality, we are now ready to move on to the final feature of our sample application: user following
114 Conclusion
With the addition of the Microposts resource, we are nearly finished with our sample application All that remains is to add a social layer by letting users follow each other We ll learn how to model such user relationships, and see the implications for the status feed, in 12
11: User Microposts
Before proceeding, be sure to commit and merge your changes if you re using Git for version control:
$ $ $ $ git git git git add commit -m "Added user microposts" checkout master merge user-microposts
You can also push the app up to Heroku at this point Because the data model has changed through the addition of the microposts table, you will also need to migrate the production database:
$ git push heroku $ heroku rake db:migrate
115 Exercises
We ve covered enough material now that there is a combinatorial explosion of possible extensions to the application Here are just a few of the many possibilities: 1 (Challenging) Add a JavaScript display to the Home page to count down from 140 characters 2 Add tests for the sidebar micropost counts (including proper pluralization) 3 (Mainly for designers) Modify the microposts listing to use an ordered list instead of a table (Note: this is how Twitter displays its status updates) Then add the appropriate CSS to make the resulting feed not look like crap 4 Add tests for micropost pagination 5 Refactor the Home page to use separate partials for the two branches of the if-else statement 6 Write a test to make sure delete links do not appear for microposts not created by the current user 7 Add a nested route so that /users/1/microposts shows all the microposts for user 1 (You will also have to add a Microposts controller index action and corresponding view) 8 Very long words currently break our layout, as shown in Figure 1117 Fix this problem using the wrap helper defined in Listing 1142 (Note the use of the raw method to prevent Rails from escaping the resulting HTML)