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method to issue a POST request to the create action As we ll see shortly, create takes in a hash corresponding to the object type being created; since this is a test for signup failure, we ll just pass an @attr hash with blank entries, as seen in Listing 86 This is essentially equivalent to visiting the signup page and clicking on the button without filling in any of the fields

render_views describe "POST 'create'" do describe "failure" do before(:each) do @attr = { :name => "", :email => "", :password => "", :password_confirmation => "" } end it "should not create a user" do lambda do post :create, :user => @attr endshould_not change(User, :count) end

int byte[]

it "should have the right title" do post :create, :user => @attr responseshould have_selector("title", :content => "Sign up") end it "should render the 'new' page" do post :create, :user => @attr responseshould render_template('new') end end end end

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In this case, we've stored everything about the message in the message table itself, but we put the content of the message to the side in a message_content table This approach is sometimes faster; the DB engine can cache more of the message_info table because it doesn't have to store the CLOBs in memory with the other data Hence, queries against the message_info table are faster than queries against your combined table In practice, a welltuned application would not even load the XML into memory until required The efficacy of all this depends on your database vendor and the application logic that you're connecting to it A skilled database administrator can help you determine which approach will make the most sense for your data and your application The mechanism of partial decomposition now kicks in: Whenever you insert a new e-mail message into the message table or update a message already there, you have to examine the XML instance, decompose the information you're interested in, and insert or update the corresponding rows in your relational schema This can happen in your application code as part of a transaction or (in databases that allow for complex coding within the database itself) as a trigger on the table If you violate an integrity constraint (for example, your e-mail message XML instance contains a From field with a user ID that doesn't correspond to a user in the relational user table), you roll back the whole transaction and kick back an error Relational integrity is maintained If you want a list of a user's email messages, a simple SQL query is all that is required:

decrement() throws comdalsemionewireadapterOneWi reIOException, comdalsemionewireOneWireException decrement(boolean reselect) throws comdalsemionewireadapterOneWi reIOException, comdalsemionewireOneWireException getAlternateNames() getCurrentWiperNumber(byte[] state) getDescription() getMaxSpeed() getName() getWiperPosition() throws comdalsemionewireadapterOneWi reIOException, comdalsemionewireOneWireException increment() throws comdalsemionewireadapterOneWi reIOException, comdalsemionewireOneWireException increment(boolean reselect) throws comdalsemionewireadapterOneWi reIOException, comdalsemionewireOneWireException isChargePumpOn(byte[] state) isLinear(byte[] state) numberOfPotentiometers(byte[] state) numberOfWiperSettings(byte[] state) OneWireContainer2C() OneWireContainer2C(comdalsemionewireadapt erDSPortAdapter sourceAdapter, byte[] newAddress) OneWireContainer2C(comdalsemionewireadapt erDSPortAdapter sourceAdapter, long newAddress) OneWireContainer2C(comdalsemionewireadapt erDSPortAdapter sourceAdapter, String newAddress) potentiometerResistance(byte[] state) readDevice() throws comdalsemionewireadapterOneWi reIOException, comdalsemionewireOneWireException

The final two tests are relatively straightforward: we make sure that the title is correct, and then we check that a failed signup attempt just re-renders the new user page (using the render_template RSpec method) The first test, on the other hand, is a little tricky The purpose of the test

it "should not create a user" do lambda do post :create, :user => @attr endshould_not change(User, :count) end

setChargePump(boolean charge_pump_on, byte[] state) setCurrentWiperNumber(int wiper_number, byte[] state) setWiperPosition(int position) throws comdalsemionewireadapterOneWi reIOException, comdalsemionewireOneWireException wiperSettingsAreVolatile(byte[] state) writeDevice(byte[] state) throws comdalsemionewireadapterOneWi reIOException, comdalsemionewireOneWireException

is to verify that a failed create action doesn t create a user in the database To do this, it introduces two new elements First, we use the RSpec change method to return the number of users in the database:

To read the actual message, you pull out the XML and transform it as necessary for the display medium you're using Using Partial Decomposition as a Caching Strategy Another way to use the tool of partial decomposition is to extract bits of data you want close at hand in your relational table For instance, it is preferable to get the subject line of each message from the database, instead of having to retrieve each XML instance (that is, the e-mail message), parse it, and pull out each subject every time you have to display a list of messages Add the message subject line to our relational schema, like so:

ADContainer, Temperature-

change(User, :count)

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