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class User < ActiveRecord::Base validates :email, :presence => true, :format => { :with => email_regex }, :uniqueness => { :case_sensitive => false } end

Note that we have simply replaced true with :case_sensitive => false; Rails infers in this case that :uniqueness should be true At this point, our application (sort of) enforces email uniqueness, and our test suite should pass

void void s s s s s s s s s s s s s s s s s s s byte byte byte byte byte int byte byte byte byte byte byte byte byte byte byte byte byte byte byte int int int

The Uniqueness Caveat There s just one small problem, the caveat alluded to above: Using validates :uniqueness does not guarantee uniqueness D oh! But what can go wrong Here s what:

Then you would define the content models for your BODY and SUBJECT elements like this:

BitPort(byte bitname) BitPort(DataPort port) clear() clear(int bitpos) throws IllegalAddressException ETH_EEDO ETH_EESK ETH_IOS0 ETH_IOS1 ETH_IOS2 latchValue Port3Bit0 Port3Bit1 Port3Bit2 Port3Bit3 Port3Bit4 Port3Bit5 Port5Bit0 Port5Bit1 Port5Bit2 Port5Bit3 Port5Bit4 Port5Bit5 Port5Bit6 Port5Bit7 read() readBit(int bitpos) throws IllegalAddressException readLatch()

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1 Alice signs up for the sample app, with address alice@wonderlandcom 2 Alice accidentally clicks on Submit twice, sending two requests in quick succession 3 The following sequence occurs: request 1 creates a user in memory that passes validation; request 2 does the same; request 1 s user gets saved; request 2 s user gets saved 4 Result: two user records with the exact same email address, despite the uniqueness validation If the above sequence seems implausible, believe me, it isn t: it happens on any Rails website with significant traffic21 Luckily, the solution is straightforward to implement; we just need to enforce uniqueness at the database level as well Our method is to create a database index on the email column, and then require that the index be unique The email index represents an update to our data modeling requirements, which (as discussed in Section 611) is handled in Rails using migrations We saw in Section 611 that generating the User model automatically created a new migration (Listing 62); in the present case, we are adding structure to an existing model, so we need to create a migration directly using the migration generator:

Unlike the migration for users, the email uniqueness migration is not pre-defined, so we need to fill in its contents with Listing 62222

s byte int void BytePort(byte portname) Port5 read() write(int value)

21 Yes, it happened to me How do you think I found out about this issue 22 Of course, we could just edit the migration file for the users table in Listing 62 but that would require rolling back and then migrating back up The Rails Way is to use migrations every time we discover that our data model needs to change

autoAnswerRemoteFrameRequest(int messageCent er, int ID, byte[] data) throws CanBusException CanBus(byte portnum) throws CanBusException CANBUS0 CANBUS1 close() throws CanBusException disableController() throws CanBusException disableMessageCenter(int messageCenter) throws CanBusException enableController() throws CanBusException enableControllerPassive() throws CanBusException enableMessageCenter(int messageCenter) throws CanBusException getRXErrorCount() throws CanBusException getTXErrorCount() throws CanBusException open() throws CanBusException receive(CanFrame frame) throws CanBusException receiveFramesAvailable() throws CanBusException receivePoll(CanFrame frame) throws CanBusException resetController() throws CanBusException sendDataFrame(int ID, boolean extendedID, byte[] data) throws CanBusException sendFrame(CanFrame frame) throws CanBusException

In the full DTD for CyberCinema in the Appendix there are more examples of this use of entities Now that we've defined our elements and how they fit together (their content models), we need to define each element's attributes Reexamining our sample instance, we find that our only attributes are ID numbers, inside the EMAIL, TO, and FROM elements Each element must have its own attribute list declaration (using the ATTLIST keyword), like so:

class AddEmailUniquenessIndex < ActiveRecord::Migration def selfup add_index :users, :email, :unique => true end def selfdown remove_index :users, :email end end

10

This uses a Rails method called add_index to add an index on the email column of the users table The index by itself doesn t enforce uniqueness, but the option :unique => true does The final step is to migrate the database:

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