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前往新版Gitcode,体验更适合开发者的 AI 搜索 >>
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fae4a263
编写于
5月 19, 2012
作者:
O
Oscar Del Ben
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activerecord/lib/active_record/aggregations.rb
activerecord/lib/active_record/aggregations.rb
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activerecord/lib/active_record/aggregations.rb
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@@ -10,9 +10,9 @@ def clear_aggregation_cache #:nodoc:
# 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
# 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).
#
# class Customer < ActiveRecord::Base
...
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@@ -109,7 +109,7 @@ def clear_aggregation_cache #:nodoc:
# It's also important to treat the value objects as immutable. Don't allow the Money object to have
# its amount changed after creation. Create a new Money object with the new value instead. The
# Money#exchange_to method is an example of this. It returns a new value object instead of changing
# its own values. Active Record won
'
t persist value objects that have been changed through means
# its own values. Active Record wont persist value objects that have been changed through means
# other than the writer method.
#
# The immutable requirement is enforced by Active Record by freezing any object assigned as a value
...
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