Agile Web Development with Rails 4th edition has been updated on recent rails version from 3.2.0 to 3.2.6:
The notable point is that Rails 3.2.6 is the first version support attr_accessible setting as default.
But, The file upload way on chapter 21 is still older one. See my post : phosphorescence: Sample for uploading file in Rails3 way on AWDwR 4th chapter21.
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