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Each iteration through the loop invokes the length method on the String object We know from the previous section that method invocations are relatively expensive operations Since strings are immutable, we know that their length will remain constant To avoid this method invocation on every loop operation, we can cache the length in a local variable So when the loop conditional is evaluated, the length is fetched quickly from the local variable rather than returned from a method The modi cations are shown in Listing 118 Listing 118 Caching the length in a local variable

before_filter :authenticate, :except => [:show, :new, :create]

Template files are more secure than SQL queries sent by means of a URL in at least two ways First, since you predefine queries in a file and these files reside on the Web server, users cannot alter the query other than by specifying parameter values Second, you can configure Web server security settings and specify different permissions on individual templates so that you can control access to queries As mentioned previously, you can also directly specify templates in a URL much as you can specify SQL queries in a URL However, if you think SQL queries are tough to enter in the query string of a URL, try specifying an XML document in a URL This method does not use a file on the Web server and suffers the same security weaknesses as sending SQL queries in a URL

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With that, the tests should now be passing, and the pages should render as shown in Figure 1216 (following) and Figure 1217 (followers) You might note that, even with the common show_followers partial, the following and followers actions still have a lot of duplication Moreover, the show_followers partial itself shares common features with the user show page Section 125 includes exercises to eliminate these sources of duplication

// Copy String length to local for faster access int len = slength(); for (int i = 0; i < len; i++) { if (scharAt(i) == ch) { ++count; } }

Now that our views are in order, it s time to get the follow/unfollow buttons working Since following a user creates a relationship, and unfollowing a user destroys a relationship, this involves writing the create and destroy actions for the Relationships controller Naturally, both actions should be protected; for signed-in users, we will use the follow! and unfollow! utility methods defined in Section 1214 to create and destroy the relevant relationships These requirements lead to the tests in Listing 1231

Next we can take a look inside the loop Every iteration invokes the charAt method to determine the character value at the speci ed index Again we can exploit the fact that strings are immutable to safely acquire a local copy of the character array and extract the characters directly from the array The modi cations are shown in Listing 119 Listing 119 Directly accessing character data

require 'spec_helper' describe RelationshipsController do describe "access control" do it "should require signin for create" do post :create responseshould redirect_to(signin_path) end it "should require signin for destroy" do delete :destroy, :id => 1 responseshould redirect_to(signin_path) end end

XPath, the XML query language introduced in a sidebar in 7, is an alternative way to query SQL Server databases XPath queries can be submitted in URLs directly, or they can be specified in template files However, unlike SQL queries, XPath queries require an additional element called an XML view, which I'll talk about shortly

// Copy String length to local for faster access int len = slength(); // Get a local copy of char[] char[] ca = new char[len]; sgetChars(0, len, ca, 0); for (int i = 0; i < len; i++) { if (ca[i] == ch) { ++count; } }

before(:each) do @user = test_sign_in(Factory(:user)) @followed = Factory(:user, :email => Factorynext(:email)) end it "should create a relationship" do lambda do post :create, :relationship => { :followed_id => @followed } responseshould be_redirect endshould change(Relationship, :count)by(1) end end describe "DELETE 'destroy'" do before(:each) do @user = test_sign_in(Factory(:user)) @followed = Factory(:user, :email => Factorynext(:email)) @userfollow!(@followed) @relationship = @userrelationshipsfind_by_followed_id(@followed) end it "should destroy a relationship" do lambda do delete :destroy, :id => @relationship responseshould be_redirect endshould change(Relationship, :count)by(-1) end end end

:relationship => { :followed_id => @followed }

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