Literal Eval in Odoo 17 - Odoo 17 Slides

Literals are the notations representing a fixed value in the code. Python supports various types of literals, such as numeric literals, string literals, Boolean literals, and more.

1. literal_eval in odoo 17 Enterprise

2. Introduction Enterprise Literals are the notations representing a fixed value in the code. Python supports various types of literals, such as numeric literals, string literals, Boolean literals, and more. The literal_eval function, found in the Python builtins module, is used to evaluate a string containing a l iteral structure. In simpler terms, it can convert a string representation of a Python data type (like an integer, list, or dictionary) back into the actual Python object. In Odoo, literal_eval is often used to safely evaluate strings containing Python expressions from user input or configuration files.

3. Enterprise The ast (Abstract Syntax Tree) module in Python is a library that provides tools for interacting with Python code itself by representing it as an abstract syntax tree. literal_eval is designed to execute arbitrary code if the input string isn't carefully validated. To use it , we need to import it from the ast module. from ast import literal_eval

4. Enterprise Consider the code from Odoo 17 addons crm module’s code. Here, assignment_domain is a field defined in the crm.team model and the method _constrains_assignment_domain just assigns the domain for the CRM Team. @api.constrains('assignment_domain') def _constrains_assignment_domain(self): for team in self: try: domain = literal_eval(team.assignment_domain or '[]') if domain: self.env['crm.lead'].search(domain, limit=1) except Exception: raise exceptions.ValidationError(_('Assignment domain for tea m %(team)s is incorrectly formatted', team=team.name))

5. Enterprise Here, the snippet domain = literal_eval(team.assignment_domain or '[]') just evaluates the string stored in the team.assignment from every CRM Team record. It returns true if the parameter is correctly a python literal. In the next statement, we need to keep the exceptional case if the literal_eval() is False. Here in this case, that result into the wrong domain assignment or the domain can be empty. So, the final except statement is written.

6. Enterprise l iteral_eval() can be U seful in case when we need to define custom filters and store them as strings in the database. These strings are safely parsed back into dictionaries using literal_eval. Used to convert the parsed filter criteria into a domain as we have seen in the previous example. So, Odoo ORM can use to search for records using this. Used for error handling

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