gistfile1.rb

# this worked as expected on mysql
# on postgresql it created a new widget with id of 0
def some_method
  widget = Widget.find_or_initialize_by_id(params[:widget_id])
  # ... 
end

# workaround code for postgresql
def some_method
  widget = Widget.find_or_initialize_by_id(params[:widget_id])
  widget = Widget.new if widget.id == 0
  # ...
end