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由 Jeremy Kemper 提交于
Correct reader method generation for primary key attribute: handle case when primary_key is defined but its column is nil, such as when the model class is backed by a view. git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@2850 5ecf4fe2-1ee6-0310-87b1-e25e094e27de
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