odoo10 关于m2o字段的去除已经选过的数据

关于m2o字段的去除已经选过的数据

<page string="Detail">
    <field name="asset_equipment_detail_ids" options="{'no_edit_no_open':1}" context="{'detail_data': asset_equipment_detail_ids}" attrs="{'readonly':[('state','!=','created')]}">
        <tree editable="bottom" create="1">
            <field name="asset_id" options="{'no_create':True}" context="{'more_domain': True, 'field_ids': parent.asset_equipment_detail_ids, 'model': 'kthrp.asset.equipment.receive.return.application.detail', 'head_company': parent.company_id}"/>
            <field name="receive_time"/>
            <field name="return_time"/>
            <field name="duration_time" options="{'readonly_save':1}" sum="Total Duration Time"/>
            <field name="note"/>
        </tree>
    </field>
</page>

@api.model
def get_domain(self):
    domain = []    
    if self.env.context.get('more_domain', False):
        field_ids = self.env.context.get('field_ids', [])
        # m2o重复选择限制
        if field_ids:
            records = []
            model = self.env[self.env.context.get('model')]
            for selected_line in field_ids:
                if selected_line[2]:
                    # 缓存数据
                    asset_id = selected_line[2].get('asset_id')
                    records.append(asset_id)
                else:
                    # 保存数据
                    asset_id = model.browse(selected_line[1]).asset_id.id
                    records.append(asset_id)
            domain += [('id', 'not in', tuple(set(records)))]