11: User Microposts in Java

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11: User Microposts
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<% if signed_in %> <table class="front" summary="For signed-in users"> <tr> <td class="main"> <h1 class="micropost">What's up </h1> <%= render 'shared/micropost_form' %> </td> <td class="sidebar round"> <%= render 'shared/user_info' %> </td> </tr> </table> <% else %> <h1>Sample App</h1> <p> This is the home page for the <a href="http://railstutorialorg/">Ruby on Rails Tutorial</a> sample application </p> <%= link_to "Sign up now!", signup_path, :class => "signup_button round" %> <% end %>
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Having so much code in each branch of the if-else conditional is a bit messy, and cleaning it up using partials is left as an exercise (Section 115) Filling in the necessary partials from Listing 1127 isn t an exercise, though; we fill in the micropost form partial in Listing 1128 and the new Home page sidebar in Listing 1129
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Listing 1128 The form partial for creating microposts
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app/views/shared/_micropost_formhtmlerb
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<%= form_for @micropost do |f| %> <%= render 'shared/error_messages', :object => fobject %> <div class="field"> <%= ftext_area :content %> </div> <div class="actions"> <%= fsubmit "Submit" %> </div> <% end %>
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Listing 1129 The partial for the user info sidebar
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app/views/shared/_user_infohtmlerb
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<div class="user_info"> <a href="<%= user_path(current_user) %>"> <%= gravatar_for current_user, :size => 30 %> <span class="user_name"> <%= current_username %> </span> <span class="microposts"> <%= pluralize(current_usermicropostscount, "micropost") %> </span> </a> </div>
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Note that, as in the profile sidebar (Listing 1116), the user info in Listing 1129 displays the total number of microposts for the user There s a slight difference in the display, though; in the profile sidebar, Microposts is a label, and showing Microposts 1 makes perfect sense In the present case, though, saying 1 microposts is ungrammatical, so we arrange to display 1 micropost (but 2 microposts ) using the convenient pluralize helper method The form defined in Listing 1128 is an exact analogue of the signup form in Listing 82, which means that it needs an @micropost instance variable This is supplied in Listing 1130 but only when the user is signed in
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Listing 1130 Adding a micropost instance variable to the home action
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app/controllers/pages_controllerrb
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class PagesController < ApplicationController def home @title = "Home" @micropost = Micropostnew if signed_in end end
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Now the HTML should render properly, showing the form as in Figure 1110, and a form with a submission error as in Figure 1111 You are invited at this point to create
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11: User Microposts
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The Home page (/) with a new micropost form
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a new post for yourself and verify that everything is working but you should probably wait until after Section 1133
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1133 A Proto-feed
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The comment at the end of Section 1132 alluded to a problem: the current Home page doesn t display any microposts If you like, you can verify that the form shown in Figure 1110 is working by submitting a valid entry and then navigating to the profile page to see the post, but that s rather cumbersome It would be far better to have a feed of microposts that includes the user s own posts, as mocked up in Figure 1112 (In 12, we ll generalize this feed to include the microposts of users being followed by the current user) Since each user should have a feed, we are led naturally to a feed method in the User model Eventually, we will test that the feed returns the microposts of the users being followed, but for now we ll just test that the feed method includes the current user s
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The home page with form errors
microposts but excludes the posts of a different user We can express these requirements in code with Listing 1131
Listing 1131 Tests for the (proto-)status feed
spec/models/user_specrb
require 'spec_helper' describe User do describe "micropost associations" do before(:each) do @user = Usercreate(@attr) @mp1 = Factory(:micropost, :user => @user, :created_at => 1dayago) @mp2 = Factory(:micropost, :user => @user, :created_at => 1hourago) end
describe "status feed" do it "should have a feed" do @usershould respond_to(:feed) end it "should include the user's microposts" do @userfeedinclude (@mp1)should be_true @userfeedinclude (@mp2)should be_true end
11: User Microposts
it "should not include a different user's microposts" do mp3 = Factory(:micropost, :user => Factory(:user, :email => Factorynext(:email))) @userfeedinclude (mp3)should be_false end end end end
These tests introduce the array include method, which simply checks if an array includes the given element:13
$ rails console >> a = [1, "foo", :bar] >> ainclude ("foo") => true >> ainclude (:bar) => true >> ainclude ("baz") => false
We can arrange for an appropriate micropost feed by selecting all the microposts with user_id equal to the current user s id, which we accomplish using the where method on the Micropost model, as shown in Listing 113214
13 Learning about methods such as include is one reason why, as noted in Section 111, I recommend reading a pure Ruby book after finishing this one 14 See the Rails Guide on the Active Record Query Interface for more on where and the like