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25 This means that the routing works, but the corresponding pages don t necessarily work at this point For example, /users/1/edit gets routed properly to the edit action of the Users controller, but since the edit action doesn t exist yet actually hitting that URL will return an error 26 Some of this tutorial s screenshots show debug information with output like !map:HashWithIndifferentAccess instead of !map:ActiveSupport::HashWithIndifferentAccess This is simply a minor difference between Rails 23 and Rails 3 Since the rendered web pages are otherwise identical between Rails versions, this one footnote saves me the trouble of redoing all the screenshots

public void externalInterruptEvent(ExternalInterruptEvent ev)

This is a YAML27 representation of params, which (as hinted at by the name HashWithIndifferentAccess) is basically a hash We see that its controller is users, its action is show, and its id attribute is "1" Although you will rarely have occasion to use params[:controller] or params[:action], using params[:id] to pull out the id from the URL is a common Rails idiom In particular, we used the code

store all of the author information, you also make it easier to extract this information from the XML later on because extracting it requires only one operation: finding and retrieving the author block The alternative would be to find and retrieve each author entry separately The head of our document is starting to take shape Building on the skeleton we constructed previously, we have a good idea of what the head looks like:

Userfind(params[:id])

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This is the method that is invoked when an external interrupt has been received The method is passed an ExternalInterruptEvent object ExternalInterruptEvent extends javautilEventObject Currently, an ExternalInterruptEvent object encapsulates no information about the source of

in Listing 625 to find the user with id 1 (The find method knows how to convert the string "1" into the integer 1) The debug information often provides useful feedback when developing Rails application, and I suggest getting in the habit of checking it whenever your application doesn t behave as expected

10

This chapter is the first half of the two-step process of creating a working User model Our users now have name and email attributes, together with validations enforcing several important constraints on their values We ve also taken a first small step toward a working user show page and a Users resource based on the principles of representational state transfer (REST) In 7, we ll complete the process by adding user passwords and a more useful user view If you re using Git, now would be a good time to commit if you haven t done so in a while:

$ git add $ git commit -am "Finished first cut of the User model"

< xml version="10"> <CYBERCINEMA_REVIEW ID="123"> <HEAD> <!-- Header information goes here --> <AUTHOR_BLOCK> <AUTHOR ID="123">Daniel Appelquist</AUTHOR> </AUTHOR_BLOCK> <REVIEWED ID="3827">Gone With the Wind</REVIEWED> <HEADLINE>Classic Film Still Fresh</HEADLINE> <ABSTRACT>This film is often thought of as the best example of classic</ABSTRACT> <CREATE_DATE DATE="2000-05-17T17:10:00,0"/> <LASTMOD_DATE DATE="2000-05-17T18:12:00,0"/> <PUBLISH_DATE DATE="2000-05-17T19:27:00,0"/> </HEAD> <BODY> <!-- Body information goes here --> </BODY> </CYBERCINEMA_REVIEW>

the interrupt It is left to the application to communicate with the attached peripheral to determine additional information about the nature of the interrupt Applications can have multiple listeners for external interrupts The rst time addEventListener is successfully called, a daemon thread is created that immediately invokes a blocking native method The native method puts the thread to sleep until an external interrupt occurs When the interrupt occurs, the daemon thread is awakened by the system and returns from the native method The thread then enumerates a vector of the event listeners and noti es them of the interrupt Once the last listener invokes the removeEventListener method, the daemon thread is destroyed The program shown in Listing 104 listens for external interrupts Every time an external interrupt occurs, it simply increments an event counter For the sake of making the event causing the interrupts more concrete, a push-button switch was used to generate the interrupts3 To test the example one side of the switch is connected to the external interrupt pin4 and the other side to ground Recall that the external interrupt pin is pulled high to its inactive state internally When the switch is closed, by depressing the push button, the external interrupt pin is pulled to ground, generating a falling edge that causes the interrupt Listing 104 PushButton

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