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require 'spec_helper' describe User do describe "micropost associations" do before(:each) do @user = Usercreate(@attr) @mp1 = Factory(:micropost, :user => @user, :created_at => 1dayago) @mp2 = Factory(:micropost, :user => @user, :created_at => 1hourago) end it "should have a microposts attribute" do @usershould respond_to(:microposts) end it "should have the right microposts in the right order" do @usermicropostsshould == [@mp2, @mp1] end end end

For convenience, let's say that I want to keep track of books by ISBN ISBNs are convenient because they provide a unique numbering scheme for books Let's take the previous example of the book references marked up by ISBN:

4 Recall that created_at and updated_at are magic columns, so any explicit initialization values are overwritten by the magic

public void set() public void clear()

@usermicropostsshould == [@mp2, @mp1]

import comdalsemisystemBitPort; class Blinky { public static void main(String[] args) { BitPort bp = new BitPort(BitPortPort3Bit5); for (;;) { // Turn on LED bpclear(); // Leave it on for 1/4 second try {

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indicating that the posts should be ordered newest first This should fail because by default the posts will be ordered by id, ie, [@mp1, @mp2] This test also verifies the basic correctness of the has_many association itself, by checking (as indicated in Table 111) that usermicroposts is an array of microposts To get the ordering test to pass, we use a Rails facility called default_scope with an :order parameter, as shown in Listing 1110 (This is our first example of the notion of scope We will learn about scope in a more general context in 12)

<document id="1">Homer's <book isbn="09872343">Odyssey</book> is a revered relic of the ancient world</document>

The order here is micropostscreated_at DESC , where DESC is SQL for descending , ie, in descending order from newest to oldest

2

Dependent: Destroy Apart from proper ordering, there is a second refinement we d like to add to microposts Recall from Section 104 that site administrators have the power to destroy users It stands to reason that if a user is destroyed, the user s microposts should be destroyed as well We can test for this by first destroying a micropost s user and then verifying that the associated microposts are no longer in the database (Listing 1111)

Threadsleep(250); } catch (InterruptedException ie) {} // Turn off LED bpset(); // Leave it off for 1/4 second try { Threadsleep(250); } catch (InterruptedException ie) {} } } }

describe User do describe "micropost associations" do before(:each) do @user = Usercreate(@attr)

@mp1 = Factory(:micropost, :user => @user, :created_at => 1dayago) @mp2 = Factory(:micropost, :user => @user, :created_at => 1hourago) end it "should destroy associated microposts" do @userdestroy [@mp1, @mp2]each do |micropost| Micropostfind_by_id(micropostid)should be_nil end end end end

I've added <document id="1"> and </document> tags around the body of my document so each document can uniquely identify itself Each XML document I write has an ID number, which I've designated should be in a tag named "document" that wraps around the entire document Again, remember that I'm just making these tags up They're not a documented standard; they're just being used for the purpose of these examples

Compile, convert, and load Blinky following the steps we used for the example However, we will make one small change to the way in which we run this program Blinky runs forever just brainlessly blinking the status LED at 2 Hz If we run it in the same fashion that we ran HelloWorld, as a foreground process, we would never get our command prompt back in the Telnet session6 We would either have to start a new Telnet session just to halt Blinky by using the kill command or removing power, forcing the system to reboot Instead, just execute Blinky in the background

Here we have used Micropostfind_by_id, which returns nil if the record is not found, whereas Micropostfind raises an exception on failure, which is a bit harder to test for (In case you re curious,

Now if you take a look at your TINI board, you should see the status LED (D1) blinking about twice per second It will continue to blink until you kill the process To kill a process from slush, you use the kill command specifying the process id on the command line To learn the process id, use the ps command

lambda do Micropostfind(micropostid) endshould raise_error(ActiveRecord::RecordNotFound)

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