我想在名为 的 hr.employee 中添加 1 个字段contract_type。每次用户在Human Resources > Employees. 我使用以下代码在新模块中创建了 xml：<?xml version="1.0" encoding="utf-8"?><openerp><data> <record id="hr_employee_view_form_inherit" model="ir.ui.view"> <field name="name">hr.employee.view.form.inherit</field> <field name="model">hr.employee</field> <field name="inherit_id" ref="hr_contract.hr_hr_employee_view_form2"/> <field name="arch" type="xml"> <xpath expr="//group[@string='Contract']/field[@name='medic_exam']" position="before"> <field name="contract_type" string="Contract Type"/> </xpath> </field> </record></data>在 py 中，contract_type定义为fields.function.from openerp import addonsimport loggingfrom openerp.osv import fields, osvfrom openerp.tools.translate import _from openerp import tools_logger = logging.getLogger(__name__)class inherit_hr_employee(osv.osv):_inherit = 'hr.employee'def _get_contract_type(self, cr, uid, ids, field_name, arg, context=None): res = {} contract_name = "" for i in ids: sql_req= """ SELECT * FROM hr_contract WHERE employee_id = %d """ % (i,) cr.execute(sql_req) sql_res = cr.dictfetchone() flag = False _is_empty = sql_res.get("date_end") contract_type = sql_res.get("type_id") if not _is_empty: flag = True if flag: sql_contract_type = """ SELECT * FROM hr_contract_type WHERE id = %d """ % (contract_type,) cr.execute(sql_contract_type) sql_contract = cr.dictfetchone() contract_name = sql_contract.get("name") for employee in self.browse(cr, uid, ids, context=context): res[employee.id] = { 'contract_type': str(contract_name) } return res_columns = { 'contract_type' : fields.function(_get_contract_type, type='text', string='Contract Type', method=True, readonly=True, size=20)}它显示空字段（该函数也没有运行）。我该如何解决这个问题？任何帮助都受到高度赞赏。
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