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由 David Heinemeier Hansson 提交于
Fixed migration trouble with SQLite when NOT NULL is used in the new definition (closes #5215) [greg@lapcominc.com] git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@4419 5ecf4fe2-1ee6-0310-87b1-e25e094e27de
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