In the context of Odoo, constraints are a way to enforce rules or conditions on the data that can be stored in certain fields of a model. These constraints help ensure that the data entered into the system meets specific criteria, promoting data accuracy and integrity.

1. Model Constrains In
Odoo 16

2. In the context of Odoo, constraints are a way to enforce rules or
conditions on the data that can be stored in certain fields of a
model. These constraints help ensure that the data entered into
the system meets specific criteria, promoting data accuracy and
integrity.

3. In this slide am going to discuss about what are the Constraints in Odoo 16,
By using the @api.constraints(‘field_name’) we can impose certain rules on the
fields of a model. These rules define what values are acceptable for those fields, and
they can vary from simple requirements (e.g., non-empty fields) to more complex
conditions based on the field's value or related records.

4. Let’s move to the code,
In our module's python files, we must define the models and fields in order
to achieve this. After defining the fields and the views, after defining these
things, this is the view of the model.

6. So in this view am going to check that the DOB is greater than the
today’s date , if it is greater than today’s date we need to raise a
validation error with the message ‘Invalid Date of Birth’.

7. Let’s check that how to use constraints for that,

8. For getting the constraints to the model, first we need to import the
‘api’ , and then for the ValidationError we need to import the
‘odoo.exceptions’,.
After defining the function for our need let’s test in the view how it is
works.

9. If i enter a date is greater than the today’s date it will raise a
validation error when we saving the form.

10. By utilizing constraints effectively, developers and administrators
can enhance the robustness and accuracy of the Odoo system,
ensuring that it effectively meets the business requirements and
maintains data integrity.

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