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Onchange & Soft warnings

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1. In an Odoo model, you have a field price and a related field tax_amount. Whenever the price changes, you want to update the tax_amount field accordingly. How do you define the onchange method for this scenario?
@api.onchange('price') @api.onchange('tax_amount') @api.onchange('price', 'tax_amount') @api.onchange('price', 'tax_amount', 'amount_total')
2. To raise a soft warning, my method should end by;
return {"warning": {"title": title_var, "message": message_var}} return {"soft_warning": message_var} raise SoftWarning(message_var) raise {"warning": {"title": title_var, "message": message_var}}
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