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由 David Heinemeier Hansson 提交于
Moved build_association and create_association for has_one and belongs_to out of deprecation as they work when the association is nil unlike association.build and association.create, which require the association to be already in place #864 git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@1146 5ecf4fe2-1ee6-0310-87b1-e25e094e27de
3b9e90a4
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