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| Modules |
| ClassMethods |
Active Record implements aggregation through a macro-like class method
called composed_of for representing attributes as value objects.
It expresses relationships like "Account [is] composed of Money [among
other things]" or "Person [is] composed of [an] address".
Each call to the macro adds a description of how the value objects are
created from the attributes of the entity object (when the entity is
initialized either as a new object or from finding an existing object) and
how it can be turned back into attributes (when the entity is saved to the
database). Example:
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<code/>and<pre/>for code samples.