How to place a mathematical function in a field

Question

I have the following fields for my product:

NAME(char); MASS(int); PRICE(float); VALUE(float)

What I would like to do is to automatically calculate the total value of the product by multiplying the MASS with the PRICE ((MASS*PRICE)/100) in the VLAUE field. How and where do I place this function?

Thanks

Ivan · Accepted Answer

@Dzingai what you need is to change the value field into a function field. In new API (v8) you need to put the compute attribute in the field definition. In both you need to develop a method in the said model to be used by the function.

You can find sample in the account.invoice modules which have quite a lot of function fields.

[1] https://doc.odoo.com/6.0/developer/2_5_Objects_Fields_Methods/field_type/#functional-fields
[2] https://www.odoo.com/documentation/8.0/reference/or

Dzingai Chakazamba · Answer

Thanks Salama. That is very helpful.

Salama Sidna · Answer

Try this  function just replace the attribut by the yours
this function should be in the class concerned

@api.depends('required_hours','completed_hours')
def presence_avarage_count(self):
for r in self:
r.presence_avarage = completed_hours / required_hours

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