ruby on rails 3 - Using simple_format somehow modifies a models attribute in-place -

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It's weird that I have a page which is a comment feature on an example of simple_format model though on the same page This is a form that allows updating this comment. When I simplify the attribute, this feature is shown in the modified form (i.e., with paragraph tags etc.) in the form.

I can not see how this is happening, unless there is any modification in the simpler format format that has a feature in place but how can this happen when it executes: 

  simple_format @ warranty.comments   
 Output:  
  & lt; P & gt; Here are some comments & lt; / P & gt;   
 and in the form below and below the page, even if we just call:  
  @ warranty.comments   
 We receive:  
  & lt; P & gt; Here are some comments & lt; / P & gt;   
 If I change it:  
  simple_format @ warranty.comments.clone   
 the behavior goes away  
 Is there anything clear to me here? Unless it was called as  @ warranty.comments.simple_format, I would not expect to modify the original feature of a text assistant!    
 
 
 It was a bug that was. The latest 3.1.0 should be fine, but I'm not sure about other versions.

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