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Listing 7-4. Updating db/migrate/010_add_facebook_id_to_user_model.rb class AddFacebookIdToUserModel < ActiveRecord::Migration def self.up add_column :users, :facebook_id, :integer, :null => true execute("ALTER TABLE users MODIFY facebook_id BIGINT") # MySQL-specific end def self.down remove_column :users, :facebook_id end end The only new thing here is the execute statement; a standard MySQL INT field is 4 bytes, which allows signed values up to 2,147,483,647. At the rate Facebook is adding new users (both real and testing), however, it makes sense to bump up the field to the 8-byte BIGINT, which permits signed values up to 9,223,372,036,854,775,807. If you re using a database other than MySQL, you ll most likely need to do something similar (using bigint in PostgreSQL, for instance). One notable exception to this requirement is SQLite3, which automatically expands INTEGER columns up to 8 bytes when necessary. With that done, go ahead and run rake db:migrate to update your database. Next, of course, you need to populate the field. Listing 7-5 shows the code to do that. Listing 7-5. Setting facebook_id in app/controllers/sessions_controller.rb class SessionsController < ApplicationController # ... def create self.current_user = User.authenticate(params[:login], params[:password]) if logged_in self.current_user.update_attribute(:facebook_id, fbsession.session_user_id) if params[:remember_me] == "1" self.current_user.remember_me cookies[:auth_token] = { :value => self.current_user.remember_token, :expires => self.current_user.remember_token_expires_at } end redirect_back_or_default('/') flash[:notice] = "Logged in successfully" else render :action => 'new' end end # ... end

a hook script. The specifics of the various subcommands are self-explanatory. Table 3-1 provides a brief summary. All of these commands, except lock, accept revision as an argument and almost all accept --transaction as an argument. Table 3-1. Reading from Transactions and Revisions with svnlook

Interpolators tell an animation how a certain property, such as a color gradient, changes over time. Will it change in a linear fashion, or in an exponential fashion Will it start quickly, but slow down toward the end Consider the alpha animation that we introduced in Listing 6 11:

<alpha xmlns:android="http://schemas.android.com/apk/res/android" android:interpolator="@android:anim/accelerate_interpolator" android:fromAlpha="0.0" android:toAlpha="1.0" android:duration="1000" />

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The animation identifies the interpolator it wants to use the accelerate_interpolator, in this case. There is a corresponding Java object that defines this interpolator. Also, note that we ve specified this interpolator as a resource reference. This means there must be a file corresponding to the anim/accelerate_interpolator that describes what this Java object looks like and what additional parameters it might take. That indeed is the case. Look at the XML file definition for @android:anim/accelerate_interpolator:

Prints the file s contents to the screen Prints paths that changed in a given revision or transaction Prints the datestamp for a transaction or revision Prints the GNU-style diff for the changed files in a transaction or revision Prints the directories that have changed or whose children have changed in a given transaction or revision Prints the author, datestamp, log message size, and log message for a revision or transaction Prints information about any locks that exist at the specified path in the repository Prints the log message for a revision or transaction Prints the value of a specified property set on a specified path or revision in the repository Prints the properties set on a path or revision in the repository Prints the tree (starting at the path in the repository, if one is given) associated with a transaction or revision

You can see this XML file in the following subdirectory within the Android package:

In this code, fbsession is provided by the RFacebook plugin; it allows you to access the Facebook session for the current user, which it knows about from the fb_sig parameters that I pointed out earlier. Basically, when an RFacebook-enabled application is hit within the Facebook interface, those fb_sig parameters are processed and stored in the local user session. When you need to pull out some Facebook-specific information, then, it s as easy as retrieving it from the fbsession object. In this case, you re just pulling out the Facebook user ID from the session and storing it in the database so that once users log in, their accounts are linked. There is, however, a problem. It turns out that the RFacebook plugin expects to be used in a Facebook-user-only environment the documentation and tutorials all recommend you add a before_filter called require_facebook_login to your application filter, redirecting anyone who visits your site outside of the Facebook interface to Facebook to log in. Since you re allowing users both within and outside of the Facebook platform, you need to tweak your application controller a bit, as shown in Listing 7-6. Listing 7-6. Checking for Facebook Sessions in app/controllers/application_controller.rb class ApplicationController < ActionController::Base before_filter :load_facebook_session before_filter :detect_iphone_request include AuthenticatedSystem helper :all # include all helpers, all the time # See ActionController::RequestForgeryProtection for details # Uncomment the :secret if you're not using the cookie session store protect_from_forgery # :secret => '51c6473c18afddc1f930646e39d01b86' protected def detect_iphone_request request.format = :iphone if iphone_request end def iphone_request request.env["HTTP_USER_AGENT"] && request.env["HTTP_USER_AGENT"][/(Mobile\/.+Safari)/] end def require_admin access_denied unless logged_in && current_user.administrator end def load_facebook_session fbsession.ready true end end

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