add search successfully
add bugsnag
adding calculation total amount
add product image URL
fixed line-item price null error
set price to 0 if nil
set product.price to a fix num to test error
change line-item to have self.product.price
change to cart controller and add order.calculate_amount to fromcart
remove has many product through line items in order model
change lineitem model to before_save instead of before validation
remove self from self.line_item