Default value priority of odoo 12 (source code analysis)

1. Find the context.

2. Find ir.default (this table is also useful in res.config.setting)

3、field.default

4. Parent class

 

@api.model
    def default_get(self, fields_list):
        """ default_get(fields) -> default_values

        Return default values for the fields in ``fields_list``. Default
        values are determined by the context, user defaults, and the model
        itself.

        :param fields_list: a list of field names
        :return: a dictionary mapping each field name to its corresponding
            default value, if it has one.

        """
        # trigger view init hook
        self.view_init(fields_list)

        defaults = {}
        parent_fields = defaultdict(list)
        ir_defaults = self.env['ir.default'].get_model_defaults(self._name)

        for name in fields_list:
            # 1. look up context
            key = 'default_' + name
            if key in self._context:
                defaults[name] = self._context[key]
                continue

            # 2. look up ir.default
            if name in ir_defaults:
                defaults[name] = ir_defaults[name]
                continue

            field = self._fields.get(name)

            # 3. look up field.default
            if field and field.default:
                defaults[name] = field.default(self)
                continue

            # 4. delegate to parent model
            if field and field.inherited:
                field = field.related_field
                parent_fields[field.model_name].append(field.name)

        # convert default values to the right format
        defaults = self._convert_to_write(defaults)

        # add default values for inherited fields
        for model, names in parent_fields.items():
            defaults.update(self.env[model].default_get(names))

        return defaults

The code flow is very clear, there is nothing to explain