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由 Marcel Molina 提交于
Do not implicitly mark recordss of has_many :through as readonly but do mark habtm records as readonly (eventually only on join tables without rich attributes). git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@4107 5ecf4fe2-1ee6-0310-87b1-e25e094e27de
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