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has_many :reverse_relationships, :foreign_key => "followed_id", :class_name => "Relationship"

because otherwise Rails will look for a ReverseRelationship class, which doesn t exist It s also worth noting that we could actually omit the :source key in this case, using simply

NoSuchPortException This exception won t actually be thrown in this example because it speci es serial0 as a hard-coded value NoSuchPortException is thrown if an invalid port name, such as serial5 or Serial0, is speci ed UnsupportedCommOperationException An unsupported baud rate was speci ed

since Rails will automatically look for the foreign key follower_id in this case I ve kept the :source key to emphasize the parallel structure with the has_many :following association, but you are free to leave it out With the code in Listing 1217, the following/follower associations are complete, and all the tests should pass This section has placed rather heavy demands on your data modeling skills, and it s fine if it takes a while to soak in In fact, one of the best ways to understand the associations is to use them in the web interface, as seen in the next section

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public void run() { // Return from read as soon as any bytes are available // (ie don t wait for line termination) ((SystemInputStream) Systemin)setRawMode(true); while (true) { try { byte b = (byte) Systeminread(); if (b == (byte) ~ ) break; // Send the byte out the serial port soutwrite(b); } catch (IOException ioe) { ioeprintStackTrace(); } } }

When capturing requirements (for instance, in the types of sessions described previously), do lead the conversation Your time and your users' time are

In the introduction to this chapter, we saw a preview of the page flow for user following In this section, we will implement the basic interface and following/unfollowing functionality shown in those mockups We will also make separate pages to show the user following and followers arrays In Section 123, we ll complete our sample application by adding the user s status feed

As in previous chapters, we will find it convenient to use the sample data Rake task to fill the database with sample relationships This will allow us to design the look and feel of the web pages first, deferring the back-end functionality until later in this section

3

When we last left the sample data populator in Listing 1120, it was getting rather cluttered, so we begin by defining separate methods to make users and microposts, and then add sample relationship data using a new make_relationships method The results are shown in Listing 1218

.

require 'faker' namespace :db do desc "Fill database with sample data" task :populate => :environment do Rake::Task['db:reset']invoke make_users make_microposts make_relationships end end def make_users admin = Usercreate!(:name => "Example User", :email => "example@railstutorialorg", :password => "foobar", :password_confirmation => "foobar") admintoggle!(:admin) 99times do |n| name = Faker::Namename email = "example-#{n+1}@railstutorialorg" password = "password" Usercreate!(:name => name, :email => email, :password => password, :password_confirmation => password) end end def make_microposts Userall(:limit => 6)each do |user| 50times do content = Faker::Loremsentence(5) usermicropostscreate!(:content => content) end end end def make_relationships users = Userall

Never guess blindly at what the user wants Always ask, or at least make an educated guess based on your user intelligence If you forget to cover an issue during this session, you will be tempted to gloss over it and make assumptions based on the way you envision them working Don't do this; you will almost always be wrong Always go back to the users and ask them, even if it is a pain

user = usersfirst following = users[150] followers = users[340] followingeach { |followed| userfollow!(followed) } followerseach { |follower| followerfollow!(user) } end

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