Hello to all.

I have just started reading the Odoo developer tutorial.

I'm starting to be quite advanced, and thinking about it I'm having a little trouble rereading the code I wrote for the iterations on self.

Example:

class
EstateProperty(models.Model):

    _name = "estate.property

    _description = "Estate property"

...

offers_ids = fields.One2many("estate.property.offer", "property_id",string="Offers")

@api.depends("offers_ids.price")

    def _compute_best_price(self):

        for property_ in self:

            offers_price = property_.mapped('offers_ids.price')

            property_.best_price = max(offers_price) if len(offers_price) != 0 else 0

In this code, why do a loop on self.

From my understanding of the code I wrote when reading the tutorial, the modification of the price of a property offer leads to a calculation to determine the best offer (the most expensive)

Why changing the price of ONE offer leads to a loop on ALL the existing offers to recalculate their "best_price"? 

I noticed that the following code (which seems more logical to read) also works

self.best_price = max(...)

I also noticed that displaying a calculated field in a "TREE" view crashes the application if you don't do a "for item on self".

So is the following logic OK ? : 
- Do a loop on self on calculated fields to be displayed in a tree view
- No loop on self, in calculated fields to be displayed in a form view

Thanks in advance for your answers.