[Rails] STI convert object to other object

Hi

I'm using STI and want to convert one object to the other. The reason to why I'm using STI is that I have a report and a full report. First someone reports something and can only enter a few fields. Then and admin can convert this into a full report and fill out the full report. Using STI makes it easier to handle the views, validations etc.

When converting it I just go to the edit action of a full_report, fetch the report and converts it into a full report using the #becomes(FullReport) method. The issue is when I submit this form and I want to save it in the update action I do this:

@report = Report.find(params[:id])

@report = @report.becomes(FullReport) if @report.type.nil?

if @report.update_attributes(report_params) ....

....

The thing is that it doesn't save the type as FullReport when I do this.

Why is that? I can't convert it, save it, reload and update it since the validations will fail.

So, how can I convert the object and update its attributes at the same time?

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