python – 用于验证日期范围的openERP函数

我的模块中有两个字段,(start_date和end_date).我想验证日期范围,因为end_date必须大于start_date并显示错误消息,如“结束日期应该大于开始日期”这是mu cord.

from openerp.osv import osv, fields


class op_batch(osv.Model):

    _name = 'op.batch'
    _columns = {
        'name': fields.char(size=25, string='Name', required=True),
        'code': fields.char(size=15, string='Code', required=True),
        'start_date': fields.date(size=15, string='Start Date', required=True),
        'end_date': fields.date(size=15, string='End Date', required=True, onchange="validate_date_range"),
        'state': fields.selection(
        [('planned', 'Planned'), ('running', 'Running'), ('cancel', 'Cancel'), ('finished', 'finished')],
        string='State'),
        'course_id': fields.many2one('op.course', string='Course', ondelete='restrict', required=True),
}

    def validate_date_range(self, cr, uid, vals, context=None):
        en_date = date.start_date.value
        st_date = date.end_date.value
        if en_date < st_date:
            raise Warning(_("End Date Should be greater than Start Date"))
    return True

    _sql_constraints = [('code', 'UNIQUE (code)', 'The CODE of the Batch must be unique!')]

    _defaults = {
    'state': 'planned',
    }

我应该怎么做？请帮我这样做……

解决方法:

为了实现数据完整性,odoo支持两种类型的约束：SQL和Python.

SQL约束被添加到数据库中的表定义中,并由PostgreSQL实现.它们是使用类属性_sql_constraints定义的.它是具有约束标识符名称,约束的SQL和要使用的错误消息的元组列表.

Python约束

在v7 api中,

_constraint是元组列表的集合.

元组包含三个参数,

>方法名称(您的实际逻辑编码)
>验证消息(要向用户显示的消息)
>字段列表(要应用约束的字段)

如果条件在创建/更新记录上返回False,_constraint将引发验证消息.

只需添加约束,

def _check_date(self, cr, uid, vals, context=None):
    for obj in self.browse(cr, uid, ids):
        start_date = obj.start_date
        end_date = obj.end_date

        if start_date and end_date:
            DATETIME_FORMAT = "%Y-%m-%d"  ## Set your date format here
            from_dt = datetime.datetime.strptime(start_date, DATETIME_FORMAT)
            to_dt = datetime.datetime.strptime(end_date, DATETIME_FORMAT)

            if to_dt < from_dt:
                return False
    return True

_constraints = [
        (_check_date, 'Your Message!', ['start_date','end_date']),
    ]

在v8 api中,

@ api.constrains

这个装饰器将确保在创建,写入,取消链接操作时调用修饰函数.如果满足约束,则函数应该使用适当的消息引发openerp.exceptions.Warning.

@api.multi
@api.constrains('start_date','end_date')
def _check_date(self):
    for obj in self:
        start_date = obj.start_date
        end_date = obj.end_date

        if start_date and end_date:
            DATETIME_FORMAT = "%Y-%m-%d"  ## Set your date format here
            from_dt = datetime.datetime.strptime(start_date, DATETIME_FORMAT)
            to_dt = datetime.datetime.strptime(end_date, DATETIME_FORMAT)

            if to_dt < from_dt:
                #raise your exception

如果要更改现有约束,可以使用继承see here来完成

标签：python,python-2-7,odoo-8,openerp-7,openerp-8
来源： https://codeday.me/bug/20190623/1274917.html