[Rails] JSON request, show error message

Hello
I am trying to show the errors that can occur by uploading a file (file
name, size).
I tried to modify this code cut-off but I could not.

else
format.html { render action: "new" }
format.json { render json: @upload.errors, status:
:unprocessable_entity }
end


I have following validations and I want json to write when an error
occured, so something like this:

else
format.html { render action: "new" }
format.json { render json: @upload.errors, status:
:unprocessable_entity, error:"Error!" }
end

(it doenst work) and I need a specification of an error, that is written
in a validation :message



my validations:


validates_uniqueness_of :upload_file_name, :message => "File with
this name is already in the database"


validates :upload_file_size, :inclusion => {:in
=>10.megabytes..20.megabytes}, :message =>"Too big or too small"

def to_jq_upload
{
"name" => read_attribute(:upload_file_name),
"size" => read_attribute(:upload_file_size),
"url" => upload.url(:original),
"delete_url" => upload_path(self),
"delete_type" => "DELETE"
}
end

end


Thanks in advanced

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