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5 Technically, Rails uses the underscore method to convert the class name to an id For example, "FooBar"underscore is foo_bar, so the foreign key for a FooBar object would be foo_bar_id (Incidentally, the inverse of underscore is camelize, which converts camel_case to CamelCase)

public boolean getNewValue()

case, although we are still dealing with users, they are now identified with the foreign key follower_id, so we have to tell that to Rails, as shown in Listing 1256

It returns true if the speci ed signal is asserted and false otherwise A common example of how control line change noti cation is useful is found in managing communications with a serial modem When the modem has established a connection with another modem, it asserts carrier detect If the remote modem hangs up, a SerialPortEventCD change event will be generated and getNewValue returns false The listener can use this information to notify the rest of the application that the modem connection is no longer valid The CTSMonitor example, shown in Listing 32, listens for changes on the CTS line Listing 32

class User < ActiveRecord::Base has_many :microposts, :dependent => :destroy has_many :relationships, :foreign_key => "follower_id", :dependent => :destroy end

<customers ContactName="Maria Anders" /> <customers ContactName="Hanna Moos" /> <customers ContactName="Sven Ottlieb" />

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(Since destroying a user should also destroy that user s relationships, we ve gone ahead and added :dependent => :destroy to the association; writing a test for this is left as an exercise (Section 125)) At this point, the association tests in Listing 123 and Listing 124 should pass As with the Micropost model, the Relationship model has a belongs_to relationship with users; in this case, a relationship object belongs to both a follower and a followed user, which we test for in Listing 126

javaioIOException; javautilTooManyListenersException; javaxcomm*; comdalsemisystemTINIOS;

6 If you ve noticed that followed_id also identifies a user, and are concerned about the asymmetric treatment of followed and follower, you re ahead of the game We ll deal with this issue in Section 1215

class CTSMonitor implements SerialPortEventListener {

it "should have a follower attribute" do @relationshipshould respond_to(:follower) end it "should have the right follower" do @relationshipfollowershould == @follower end it "should have a followed attribute" do @relationshipshould respond_to(:followed) end

In this case, SQL Server names each row element with the name of the table in the result set Again, columns from the table are returned as attributes What happens if we return columns from more than one table Suppose we want to see a list of customers and all of the orders each customer has placed

To write the application code, we define the belongs_to relationship as usual Rails infers the names of the foreign keys from the corresponding symbols (ie, follower_id from :follower, and followed_id from :followed), but since there is neither a Followed nor a Follower model we need to supply the class name User The result is shown in Listing 127

3

class Relationship < ActiveRecord::Base attr_accessible :followed_id belongs_to :follower, :class_name => "User" belongs_to :followed, :class_name => "User" end

SerialPort sp;

The followed association isn t actually needed until Section 1215, but the parallel follower/followed structure is clearer if we implement them both at the same time

SELECT ContactName, OrderID FROM Customers INNER JOIN Orders ON CustomersCustomerID = OrdersOrderID WHERE CustomersCountry = 'Germany' FOR XML AUTO

Before moving on, we ll add a couple of Relationship model validations for completeness The tests (Listing 128) and application code (Listing 129) are straightforward

CTSMonitor() throws NoSuchPortException, PortInUseException { // // // sp Specify a timeout value of at least a few seconds before failing on open attempt This allows another process (probably slush) to relinquish port ownership = (SerialPort) CommPortIdentifiergetPortIdentifier("serial0")open( "CTSMonitor", 5000); try { // Enable the use of hardware handshake lines for serial0 TINIOSsetRTSCTSFlowControlEnable(0, true); } catch (UnsupportedCommOperationException usce) { // Won t happen on serial0 } try { spaddEventListener(this); spnotifyOnCTS(true); } catch (TooManyListenersException tmle) {} } public void serialEvent(SerialPortEvent event) { switch (eventgetEventType()) { case SerialPortEventCTS: Systemoutprintln("CTS change, new value="+ eventgetNewValue()); break; default: } } public static void main(String[] args) { try { CTSMonitor cm = new CTSMonitor(); try { Threadsleep(LongMAX_VALUE); } catch (InterruptedException ie) {} } catch (Exception e) { Systemoutprintln(egetMessage()); eprintStackTrace(); } } }

describe Relationship do describe "validations" do it "should require a follower_id" do @relationshipfollower_id = nil @relationshipshould_not be_valid end it "should require a followed_id" do @relationshipfollowed_id = nil @relationshipshould_not be_valid end end end

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