Raised when there are multiple errors while doing a mass assignment through the attributes method. The exception has an errors property that contains an array of AttributeAssignmentError objects, each corresponding to the error while assigning to an attribute.

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August 4, 2008
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How to handle the MultiparameterAssignmentErrors exception

If you expect to get this error, do this in your controller:

def create
  @event = Event.new
  @event.attributes = params[:event]
  @event.save!
rescue ActiveRecord::MultiparameterAssignmentErrors => e
  e.errors.each do |error|
    @event.errors.add(error.attribute, ActiveRecord::Errors.default_error_messages[:invalid])
  end
rescue ActiveRecord::RecordInvalid
  # event is invalid
ensure
  if @event.errors.empty? and not @event.new_record?
    redirect_to event_path(@event)
  else
    render :action => :new
  end
end

If attribute assignment gives the MultiparameterAssignmentErrors exception we handle it by adding ‘invalid’ errors to the attributes involved. We also rescue the RecordInvalid exception and handle all the redirecting/rendering in the ensure block.

May 22, 2009
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Alternative Way to Handle

This plugin may also help solve the problem from the model side.

http://github.com/rxcfc/multi_assignment_sanity