视图模型与普通model模型差不多，主要区别在于：

1、 _auto 设置为 False：意思是不让odoo框架接管模型的处理，而是由我们自己来处理。

2、重写init函数：

3、定义的字段要与查询的结果类型一致。

4、查询中切记不要忘记id字段，不然会报错。

class report_employee(models.Model):
    _name = 'xxx.view.employee'
    _rec_name = 'employeeName'
    _description = u'员工视图'
    _auto = False

    employeeId = fields.Char(u'工号', readonly=True)
    employeeName = fields.Char(u'姓名', readonly=True)
    employeeCategory = fields.Char(u'人员身份', readonly=True)
    entryDate = fields.Date(u'入职日期', readonly=True)
    entryYear = fields.Integer(u'入职年份', readonly=True)
    entryMonth = fields.Char(u'入职月份', readonly=True)
    status = fields.Integer(u'状态', readonly=True)
    leaveDate = fields.Date(u'离职日期', readonly=True)
    leaveYear = fields.Integer(u'离职年份', readonly=True)
    leaveMonth = fields.Char(u'离职月份', readonly=True)
    entryPeriod = fields.Integer(u'入职周期', readonly=True)
    leaveDate = fields.Date(u'离职日期', readonly=True)
    lastExamPassDays = fields.Integer(u'距上次体检天数', readonly=True)

    def init(self):
        tools.sql.drop_view_if_exists(self.env.cr, self._table)
        self.env.cr.execute('''
                CREATE OR REPLACE VIEW %s AS (
                    select a.*,coalesce(date_part('day',cast(now() as TIMESTAMP)-cast(b."examTime" as TIMESTAMP)),0) as "lastExamPassDays"
                    from
                    (
                        select id, "employeeId", "employeeName", 
                                case "isIntern" when true then '02' else '01' end as "employeeCategory", 
                                "entryDate", 
                                extract(year from "entryDate") as "entryYear", extract(month from "entryDate") as "entryMonth",
                                365-date_part('day',cast(now() as TIMESTAMP)-cast("entryDate" as TIMESTAMP)) as “entryPeriod”,
                                case "isLeave" when true then 2 else 1 end as status,
                                "leaveDate", 
                                extract(year from "leaveDate") as "leaveYear", extract(month from "leaveDate") as "leaveMonth"
                        from xxx_employee
                    ) a
                    left join 
                    (
                        select x.*
                        from xxx_exam x,
                        (
                            select "employeeId",max(id) as id
                            from xxx_exam
                            group by "employeeId"
                        ) y    
                        where x.id =y.id
                    ) b on a.Id=b."employeeId" 
                )''' % self._table)