In this slide, we will discuss the api.constrains() decorator in Odoo 17, a powerful tool for defining custom data validation rules within your models. We will explore its implementation, usage scenarios, and essential considerations for effective data integrity in your Odoo applications.

1. How to Use
api.constrains() in
Odoo 17
Enterprise

2. Introduction
Enterprise
In this slide, we will discuss the api.constrains() decorator in
Odoo 17, a powerful tool for defining custom data validation
rules within your models. We will explore its implementation,
usage scenarios, and essential considerations for effective
data integrity in your Odoo applications.

3. Enterprise
What is api.constrains()
● A decorator used to define custom data validation rules
in Odoo models.
● Ensures data adheres to specific business logic before
being saved to the database.
● Offers greater flexibility compared to standard database
constraints.

4. Enterprise
Using api.constrains()
● Define a method decorated with @api.constrains(*fields).
● The *fields argument specifies the fields involved in the
validation.
● The method should raise a ValidationError if the
validation fails.

5. Enterprise
Example: Validating product price
from odoo.exceptions import ValidationError
class Product(models.Model):
_name = 'product.product'
name = fields.Char(string='Product Name', required=True)
list_price = fields.Float(string='List Price', required=True)
cost_price = fields.Float(string='Cost Price', required=True)
@api.constrains('list_price', 'cost_price')
def _check_price(self):
if self.list_price < self.cost_price:
raise ValidationError("List price cannot be lower
than cost price!")

6. Enterprise
This example demonstrates how to validate the list price of a
product against its cost price. The _check_price method,
decorated with @api.constrains('list_price', 'cost_price'),
ensures that the list price is always greater than or equal to the
cost price. If this condition is violated, a ValidationError is
raised, preventing the product from being saved with an
invalid price configuration.

7. For More Info.
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functional and technical videos in Odoo.
Enterprise
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