Odoo 16 - how to bring a value from another model into the current working model

Odoo documentation is very limited and finding help is further scary. I am sharing a quick tip on how to get a value into the current working model from a different model

There are two ways to access a field from a different model file in Odoo 16:

1. Using a Many2one field:

This is the most common way to access a field from a different model file.

For example, let's say you have two models: Customer and Product. The Customer model has a product_id field, which is a Many2one field that references the Product model.

To access the product_name field from the Product model in the Customer model, you would use the following code:

Python

class Customer(models.Model):
    _name = 'res.partner'

    product_id = fields.Many2one('product.product', 'Product')

    product_name = fields.Char(compute='_compute_product_name')

    @api.depends('product_id')
    def _compute_product_name(self):
        for customer in self:
            if customer.product_id:
                customer.product_name = customer.product_id.name

This code will create a new field called product_name on the Customer model, which will be populated with the value of the name field on the Product model.

2. Using a Related field:

A Related field allows you to access a field from another model without having to create a Many2one field.

For example, let's say you have the same two models as above, but you don't want to create a Many2one field on the Customer model.

To access the product_name field from the Product model in the Customer model using a Related field, you would use the following code:

Python

class Customer(models.Model):
    _name = 'res.partner'

    product_name = fields.Related('product_id', 'name')

This code will create a new field called product_name on the Customer model, which will be populated with the value of the name field on the Product model.

Which method you use to access a field from a different model file depends on your specific needs. If you need to be able to update the value of the field, then you should use a Many2one field. If you only need to read the value of the field, then you can use a Related field.