关于不同产品类型，生成不同的产品序号的问题？

[billchen0769]

请问一下根据不同的产品类别生成不同的产品编号，有什么简单的方法实现，我想到的方法是给一个新字段，然后根据该字段的内容匹配不同的产品序号，但是获取不到该字段的内容，有什么方法解决，或者有什么更好的实现方法？

class ProductTemplateInherit(models.Model):
_inherit = 'product.template'
x_category_ordinal = fields.Char(related='categ_id.x_ordinal', string='产品类型序号', required=True)
default_code = fields.Char(default=lambda self: _(' '))

@api.model
def create(self, vals):
    if vals.get("x_category_ordinal") is None:
        # 获取记录中的实际数据值
        record = self.env['product.template'].browse(vals['categ_id'])
        x_category_ordinal = record.x_category_ordinal
        vals['x_category_ordinal'] = x_category_ordinal

    if vals.get('default_code', _(' ')) == _(' '):
        if vals['x_category_ordinal'] == 'value1':
            vals['default_code'] = self.env['ir.sequence'].next_by_code('sequence_code_1') or _(' ')
        elif vals['x_category_ordinal'] == 'value2':
            vals['default_code'] = self.env['ir.sequence'].next_by_code('sequence_code_2') or _(' ')
        elif vals['x_category_ordinal'] == 'value3':
            vals['default_code'] = self.env['ir.sequence'].next_by_code('sequence_code_3') or _(' ')
        elif vals['x_category_ordinal'] == 'value4':
            vals['default_code'] = self.env['ir.sequence'].next_by_code('sequence_code_4') or _(' ')
        else:
            vals['default_code'] = self.env['ir.sequence'].next_by_code('default_sequence') or _(' ')

    res = super(ProductTemplateInherit, self).create(vals)
    return res