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Module: HR Org Chart

Entity: hr.employee.base

Compute Method: _compute_child_count

Inputs Method Outputs 
employee_read_group = self._read_group(
            [('parent_id', 'in', self.ids)],
            ['parent_id'],
            ['id:count'],
        )
child_count_per_parent_id = dict(employee_read_group)
for employee in self:
            employee.child_count = child_count_per_parent_id.get(employee._origin, 0)

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