How to Use api.constrains ( ) in Odoo 17
- 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.
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