seen from Malaysia
seen from United States
seen from Türkiye
seen from China
seen from Algeria
seen from China
seen from China
seen from United States
seen from United States
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seen from Germany
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Error: undefined method `stringify_keys' for "Edit post":String
Solution: If you’re using simple_form gem, then the problem is going to be the fact that you used “form_for” on the form. Instead, you should use: “simple_form_for”.
So change that and Rails will be happy again :)
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undefined method `[]' for nil:NilClass
新建 mysql 資料庫時出現問題： $ rake db:create forum_test already exists rake aborted! undefined method `[]' for nil:NilClass 看得出 `test` 環境沒事，加 `RAILS_ENV=production` 測試也 OK，問題只出在 `development`。 再三檢查 `database.yml` 才發現，原來是因為 development 前面，我多打了個 i： idevelopment: 題外話，`RAILS_ENV=production` 若是打成 `RAILS_ENV="production"` 也是不可以的 XD ## Reference * [ruby on rails 3 - rake undefined method `[]' for nil:NilClass - Stack Overflow](http://stackoverflow.com/questions/7623983/rake-undefined-method-for-nilnilclass)
