How to get models id CRM in inherit

Question

I have a problem in odoo 18: I want to move Activity into page tab, but when I try to create or update, I get an error like this:

How can I fix this?

This is my model:

from odoo import models, fields

class Lead(models.Model):
    _inherit = "crm.lead"

    models_id = fields.Integer(lambda self: self._get_model_id())

    def _get_model_id(self):
        ir_model = self.env['ir.model'].search([('model', '=', 'crm.lead')], limit=1)
        if not ir_model:
            raise ValueError("Could not find the 'crm.lead' model in ir.model.")
        return ir_model.id

And this is my XML code:

<xpath expr="//page[@name='lead']" position="after">
    <page name="activity" string="Activity">
        <field name="activity_ids" widget="one2many_list" context="{'default_res_model_id': models_id }">
           <list>
               <field name="activity_type_id" string="Type"/>
               <field name="summary" string="Deskription"/>
               <field name="date_deadline" string="Planned Start Date"/>
               <field name="state" string="Status"/>
           </list>
        </field>
    </page>
</xpath>