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In addition to the configuration options used to instruct Active Record on how to handle naming of tables and primary keys, there are a number of other settings that govern miscellaneous functions Set them in an initializer

Tells Rails whether to use Timelocal (using :local) or Timeutc (using :utc) when pulling dates and times from the database Defaults to :local

Specifies the format to use when dumping the database schema with certain default rake tasks Use the :sql option to have the schema dumped as potentially database-specific SQL statements Just beware of incompatibilities if you re trying to use the :sql option with different databases for development and testing The default option is :ruby, which dumps the schema as an ActiveRecord::Schema file that can be loaded into any database that supports migrations

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Specifies whether Active Record should store the full constant name including namespace when using Single-Table Inheritance (STI), covered in 9, Advanced Active Record

<composite name="CreditComposite" xmlns:bb="http://bigbankcom"> <component name=" CreditServiceComponent"> <implementationcomposite name=" loan:CreditServiceComposite"/> <property name="validationRules"> <bb:validationRules> <bb:rule name="ssn"> <bb: eld>ssn</b: eld> <bb:format>^\d{3}-\d{2}-\d{4}$</bb:format> </bb:rule> <bb:rule name="zip"> <bb: eld>zipCode</bb: eld> <bb:format>^\d{5}$|^\d{5}-\d{4}$</bb:format> </bb:rule> </bb:validationRules> </property> </component> </composite>

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This chapter covered the fundamentals of Active Record, the framework included with Ruby on Rails for creating database-bound model classes We ve learned how Active Record expresses the convention over configuration philosophy that is such an important part of the Rails way, and how to make settings manually, which override the conventions in place We ve also looked at the methods provided by ActiveRecord::Base, the parent class of all persistent models in Rails, which include everything you need to do basic CRUD operations: Create, Read, Update, and Delete Finally, we reviewed how to drill through Active Record to use the database connection whenever you need to do so In the following chapter, we continue our coverage of Active Record by learning about how related model objects interact via associations

Figure 75 Sign error that occurs when a 4-bit integer is cast from signed to unsigned or vice versa

Baby step to four o clock Baby step to four o clock Bob Wiley, in the movie What About Bob (Touchstone Pictures, 1991)

It s a fact of life that the database schema of your application will evolve over the course of development Tables are added, names of columns are changed, things are dropped you get the picture Without strict conventions and process discipline for the application developers to follow, keeping the database schema in proper lock-step with application code is traditionally a very troublesome job Migrations are the Rails way of helping you to evolve the database schema of your application (also known as its DDL) without having to drop and re-create the database each time you make a change And not having to drop and recreate the database each time a change happens means that you don t lose your development data That may or may not be that important, but is usually very convenient The only changes made when you execute a migration are those necessary to move the schema from one version to another, whether that move is forward or backward in time Of course, being able to evolve your schema without having to recreate your databases and the loading/reloading of data is an order of magnitude more important once you re in production

The code in Example 74 processes user input composed of a series of variable-length strings stored in a single char* location The first 2 bytes of input dictate the size of the structure to be processed The programmer has set an upper bound on the string size: The input will be processed only if len is less than or equal to 512 The problem is that len is declared as a short (a signed data type), so the check against the maximum string length is a signed comparison Later, len is implicitly converted to an unsigned integer for the call to memcpy() If the value of len is negative, it will appear that the string has an appropriate size (the if branch will be taken), but the amount of memory copied by memcpy() will be very large (much larger than 512) and the attacker will be able to overflow buf with the data in strm

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