Quoting Rob Lacey <[email protected]>:
> 
> Hi there,
> 
> I've recently upgraded our main application to Rails 2.2.2, but I've run 
> into an interesting problem. I am trying to update a User object for 
> example, but I keep getting the 'can't modify frozen hash' error when 
> attempting to call update attributes. It seems that the user object's 
> attributes that I am trying to update are frozen, although I can see no 
> reason for this whatsoever. Its only a very basic controller, with show, 
> edit, update, etc actions there are no other associated objects. I 
> simply do a simple
> 
> @user = User.find(params[:id])
> @user.update_attributes(params[:user])
> 
> The @user object is showing as frozen directly after the find. Looking 
> through the full trace from my app the only thing I can see that I think 
> might cause it is the query cache, although I am unsure of how to really 
> to troubleshoot this any further.

Do you have any associations with values?  For example, has_many :through with
fields in the join table besides the two IDs?  Those will be read only.

HTH,
  Jeffrey

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