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Page 2 of the user index (/users page=2)
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Listing 1029 Defining a Factory Girl sequence
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spec/factoriesrb
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Factorydefine :user do |user| username "Michael Hartl" useremail "mhartl@examplecom" userpassword "foobar" userpassword_confirmation "foobar" end Factorysequence :email do |n| "person-#{n}@examplecom" end
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This arranges to return email addresses like person-1@examplecom, person2@examplecom, etc, which we invoke using the next method:
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10: Updating, Showing, and Deleting Users
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Factory(:user, :email => Factorynext(:email))
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Applying the idea of factory sequences, we can make 31 users (the original @user plus 30 more) inside a test, and then verify that the response has the HTML expected from will_paginate (which you should be able to determine using Firebug or by viewing the page source) The result appears in Listing 1030
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Listing 1030 A test for pagination
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spec/controllers/users_controller_specrb
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require 'spec_helper' describe "UsersController" do render_views describe "GET 'index'" do describe "for signed-in users" do before(:each) do @users = [@user, second, third] 30times do @users << Factory(:user, :email => Factorynext(:email)) end end it "should have an element for each user" do get :index @users[02]each do |user| responseshould have_selector("li", :content => username) end end it "should paginate users" do get :index responseshould have_selector("divpagination") responseshould have_selector("spandisabled", :content => "Previous") responseshould have_selector("a", :href => "/users page=2", :content => "2")
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Showing Users
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responseshould have_selector("a", :href => "/users page=2", :content => "Next") end end end end
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This code ensures that the tests invoke pagination by adding 309 users to the @users variable using the Array push notation <<, which appends an element to an existing array:
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$ rails console >> a = [1, 2, 5] => [1, 2, 5] >> a << 17 => [1, 2, 5, 17] >> a << 42 << 1337 => [1, 2, 5, 17, 42, 1337]
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We see from the last example that occurrences of << can be chained In the test itself, note the compact notation have_selector("divpagination"), which borrows the class convention from CSS (first seen in Listing 53) to check for a div tag with class pagination Also note that, since there are now 33 users, we ve updated the user element test to use only the first three elements ([02]) of the @users array, which is what we had before in Listing 1019:
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@users[02]each do |user| responseshould have_selector("li", :content => username) end
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With that, our pagination code is well-tested, and there s only one minor detail left, as we ll see in the next section
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9 Technically, we only need to create 28 additional factory users since we already have three, but I find the meaning clearer if we create 30 instead
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10: Updating, Showing, and Deleting Users
1034 Partial Refactoring
The paginated user index is now complete, but there s one improvement I can t resist including: Rails has some incredibly slick tools for making compact views, and in this section we ll refactor the index page to use them Because our code is well-tested, we can refactor with confidence, assured that we are unlikely to break our site s functionality The first step in our refactoring is to replace the user li from Listing 1027 with a render call (Listing 1031)
Listing 1031 The first refactoring attempt at the index view
app/views/users/indexhtmlerb
<h1>All users</h1> <%= will_paginate %> <ul class="users"> <% @userseach do |user| %> <%= render user %> <% end %> </ul> <%= will_paginate %>
Here we call render not on a string with the name of a partial, but rather on a user variable of class User;10 in this context, Rails automatically looks for a partial called _userhtmlerb, which we must create (Listing 1032)
Listing 1032 A partial to render a single user
app/views/users/_userhtmlerb
<li> <%= gravatar_for user, :size => 30 %> <%= link_to username, user %> </li>
This is a definite improvement, but we can do even better: we can call render directly on the @users variable (Listing 1033)
10 The name user is immaterial we could have written @userseach do |foobar| and then used render foobar The key is the class of the object in this case, User
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Listing 1033 The fully refactored user index
app/views/users/indexhtmlerb
<h1>All users</h1> <%= will_paginate %> <ul class="users"> <%= render @users %> </ul> <%= will_paginate %>
Here Rails infers that @users is an list of User objects; moreover, when called with a collection of users, Rails automatically iterates through them and renders each one with the _userhtmlerb partial The result is the impressively compact code in Listing 1033