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Override onchange method in old API with new API

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I am working on a custom module for Odoo 9 that interacts HR contract (model hr.contract).
My situation is that I want raise onchange event on employee_id field but the onchange method was originally written in old API with the combination of a Python method and XML definition as below:

    def onchange_employee_id(self, cr, uid, ids, employee_id, context=None):
        if not employee_id:
            return {'value': {'job_id': False, 'department_id': False}}
        emp_obj = self.pool.get('hr.employee').browse(cr, uid, employee_id, context=context)
        job_id = dept_id = False
        if emp_obj.job_id:
            job_id = emp_obj.job_id.id
        if emp_obj.department_id:
            dept_id = emp_obj.department_id.id
        return {'value': {'job_id': job_id, 'department_id': dept_id}}

<field name="employee_id" on_change="onchange_employee_id(employee_id)"/>

I have a custom field name last_contract_id (many2one to hr.contract) and I want it to be loaded automatically on change of employee_id (just to show the contracts that owned by the selected employee.

My aim is to override it using new API which I can reuse later in Odoo 10, 11, …

How can I do it, plz?
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Firstly, you need to replace the xml definition of the employee_id field so that it will not call the onchange_employee_id method anymore. You can do in your inherited view, e.g.

		<record model="ir.ui.view" id="your_inherited_view_id">
			<field name="name">hr.contract.form</field>
			<field name="model">hr.contract</field>
			<field name="inherit_id" ref="hr_contract.hr_contract_view_form" />
			<field name="arch" type="xml">
				<xpath expr="//field[@name='employee_id']" position="replace">
					<field name="employee_id" /> <!– you can add something else here depending on your needs –>
				</xpath>
			</field>
		</record>

In your model which inherit hr.contract, just make something like this:
    @api.onchange('employee_id')
    def onchange_employee_id(self):
        # override onchange in old API to make it compatible with new API
        res = super(hr_contract, self).onchange_employee_id(self.employee_id.id)
        if type(res) is dict and res.has_key('value'):
            for field, value in res.get('value').items():
                if hasattr(self, field):
                    setattr(self, field, value)
        
        #after this line, things are totally in new API style
        #filter data for last_contract_id field to just list contracts belong to the selected employee
        if self.employee_id:
            res['domain'] = {'last_contract_id':[('employee_id', '=', self.employee_id.id)]}
        return res[/code]
Restart your Odoo and upgrade your module.
Let me know if it works.
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ViindooBot
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It works perfectly. Tks!

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