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It s important to recognize that a wrap-around can cause integer under ow just as easily as it can integer over ow The code in Example 72 demonstrates a simple memory-allocation function that allocates memory for a string with a user-supplied size read from a le Before allocating the buffer, the code sanity-checks that the size supplied by the user is not greater

%ulrecentcomments - recent_commentseach do |comment| %licomment %h4= commentcreated_at = commenttext meta Comment on: = link_to commentcommentabletitle, commentcommentable Yes, this would result in N+1 selects

So far, so good The polymorphic association makes it easy to access all types of comments in one listing In order to find all of the unreviewed comments for an item, we can use a named scope on the Comment class together with the comments association

class Comment < ActiveRecord::Base scope :unreviewed, where(:reviewed => false) end >> timesheetcommentsunreviewed

than 1024 and then decrements the size by one to account for the fact that the newline (\n) present in the le will not be copied to the in-memory buffer However, depending on the value of readamt, decrementing its value could cause erroneous results If the variable is declared as unsigned and an attacker causes getstringsize() to return 0, malloc() will be invoked with an argument of 4294967295 (the largest unsigned 32-bit integer) and the operation will likely fail due to insuf cient memory

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Both Timesheet and ExpenseReport currently have identical has_many methods for comments Essentially, they both share a common interface They re commentable! To minimize duplication, we could specify common interfaces that share code in Ruby by including a module in each of those classes, where the module contains the code common to all implementations of the common interface So, mostly for the sake of

example, let s go ahead and define a Commentable module to do just that, and include it in our model classes:

Fortunately, most applications are likely to make much more use of simple property types, such as string and integer, than complex ones In the cases where simple types are used, the only XPath you need to remember is the $ character preceding the composite property name being referenced Multivalued Properties Property values may contain multiple values, such as a collection of strings or integers Multivalued properties are declared by setting the @many attribute to true (the default is false), as shown in Listing 522

Example 72 In this integer wrap-around error, a value is decremented below the smallest value its data type can represent

module Commentable has_many :comments, :as => :commentable end class Timesheet < ActiveRecord::Base include Commentable end class ExpenseReport < ActiveRecord::Base include Commentable end

Whoops, this code doesn t work! To fix it, we need to understand an essential aspect of the way that Ruby interprets our code dealing with open classes

In many other interpreted OO programming languages, you have two phases of execution one in which the interpreter loads the class definitions and says this is the definition of what I have to work with, followed by the phase in which it executes the code This makes it difficult (though not necessarily impossible) to add new methods to a class dynamically during execution In contrast, Ruby lets you add methods to a class at any time In Ruby, when you type class MyClass, you re doing more than simply telling the interpreter to define a class; you re telling it to execute the following code in the scope of this class Let s say you have the following Ruby script:

unsigned int readamt; readamt = getstringsize(); if (readamt > 1024) return -1; readamt--; // don't allocate space for '\n' buf = malloc(readamt);

1 2 3 4 5 6 class Foo < ActiveRecord::Base has_many :bars end class Foo < ActiveRecord::Base belongs_to :spam end

<composite name="CreditServiceComposite" xmlns:xs="http://wwww3org/2001/XMLSchema"> <property name="validStates" many="true" type="xs:NMToken"> CA MA NY </property> <component name ="CreditComponent"> <component> </composite>

reset sequence!(table, column, sequence = nil)

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