# Acts as attachement

**URL:** <https://discuss.rubyonrails.org/t/acts-as-attachement/5116>\
**Category:** rubyonrails-talk\
**Created:** [November 28, 2006, 12:54am UTC](https://discuss.rubyonrails.org/t/acts-as-attachement/5116 "2006-11-28T00:54:40Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Rick\_Olson](https://avatars.discourse-cdn.com/v4/letter/r/898d66/32.png) [@Rick\_Olson](https://discuss.rubyonrails.org/u/Rick_Olson)\
**Post date:** [November 28, 2006, 12:54am UTC](https://discuss.rubyonrails.org/t/acts-as-attachement/5116/1 "2006-11-28T00:54:40Z")

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> undefined method `content\_type' for "image.jpg":String

Make sure you have :multipart =\> true set correctly in the form tag. It's trying to call params[:uploaded\_data].content\_type