[Python] How to get models id CRM in inherit

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



I have tried some solutions, but it's still not work, This is one of my solution, any can help me to fix this?

My model:


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>

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