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Once a composed_of relationship is specified for a model, records can be loaded from the database by specifying an instance of the value object in the conditions hash The following example finds all customers with balance_amount equal to 20 and balance_currency equal to "USD":

Figure 71 Number wheels that show the range of values that can be represented by signed and unsigned 4-bit integers

Customerwhere(:balance => Moneynew(20, "USD"))

Con guring Composite Properties Composite properties would not be very useful unless they could be accessed by contained components The SCDL in Listing 521 demonstrates how to do this

class Expense < ActiveRecord::Base composed_of :cost, :class_name => "Money", :mapping => [%w(cents cents), %w(currency currency_as_string)], :constructor => Procnew do |cents, currency| Moneynew(cents || 0, currency || Moneydefault_currency) end end

1111 1111 + 0001

Remember to add a migration with the 2 columns, the integer cents and the string currency that money needs

12 http://githubcom/FooBarWidget/money/

class CreateExpenses < ActiveRecord::Migration def selfup create_table :expenses do |table| tableinteger :cents tablestring :currency end end def selfdown drop_table :expenses end end

0001 0000

<composite name="CreditServiceComposite" xmlns:xs="http://wwww3org/2001/XMLSchema"> <property name="min" type="xs:integer">200</property> <property name="max" type="xs:integer">700</property> <component name ="CreditComponent"> <property name="min" source="$min"/> <property name="max" source="$max"/> <component> </composite>

>> >> >> => >> => expense = Expensecreate(:cost => Moneynew(1000, "USD")) cost = expensecost costcents 1000 expensecurrency "USD"

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In this section, we ll talk about one strategy for breaking out functionality that is shared between disparate model classes Instead of using inheritance, we ll put the shared code into modules In the section Polymorphic has_many Relationships, we described how to add a commenting feature to our recurring sample Time and Expenses application We ll continue fleshing out that example, since it lends itself to factoring out into modules The requirements we ll implement are as follows: Both users and approvers should be able to add their comments to a Timesheet or ExpenseReport Also, since comments are indicators that a timesheet or expense report requires extra scrutiny or processing time, administrators of the application should be able to easily view a list of recent comments Human nature being what it is, administrators occasionally gloss over the comments without actually reading them, so the requirements specify that a mechanism should be provided for marking comments as OK first by the approver, then by the administrator Again, here is the polymorphic has_many :comments, :as => :commentable that we used as the foundation for this functionality:

u_int nresp; nresp = packet_get_int(); if (nresp > 0) { response = xmalloc(nresp*sizeof(char*)); for (i = 0; i < nresp; i++) response[i] = packet_get_string(NULL); }

Next we enable the controller and action for the administrator that list the 10 most recent comments with links to the item to which they are attached

class Comment < ActiveRecord::Base scope :recent, order('created_at desc')limit(10) end class CommentsController < ApplicationController before_filter :require_admin, :only => :recent expose(:recent_comments) { Commentrecent } end

The @source attribute of the <property> element instructs the SCA runtime to set the value of the property to the given composite property value The source attribute value is an XPath expression We discuss XPath in more detail later in the chapter, but if you are not familiar with it, XPath is essentially a technology for addressing parts of an XML document Because SCDL is XML, SCA uses XPath to refer to XML values In the example, the $ character is an XPath operator that instructs the SCA runtime to select the min and max properties Why did the SCA authors choose XPath as the expression language for referencing composite properties as opposed to something simpler, such as just referring to the property name As we show in the next sidebar, basic XPath is relatively easy to write Also, there are times when only part of a composite property or subelement needs to be selected, such as when the property is a complex type containing several data parts (We cover complex types in a later section) XPath is a widely accepted standard for doing this, and inventing a technology would likely lead to more complexity as people would need to master a new approach

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