I'm new in Odoo and Phyton. I've just develop a module to extend CRM, adding products in opportunities.

I used function fields to calculate price vs. quantity on opportunities lines (products). Now I want to sumarize all lines and put on opportunity's planned_revenue field. But I don't know what to put in this FOR statment. This line rises an error:  for line in x_crm_lead.crm_lead_line: "crm_lead.py", line 13, in _amount_all AttributeError: type object 'x_crm_lead' has no attribute 'crm_lead_line'

There is my two classes:

class x_crm_lead(osv.Model):
    _name = 'crm.lead'
    _description = 'CRM Lead Extended'
    _inherit = 'crm.lead'

    def _amount_all(self, cr, uid, ids, field_name, arg, context=None):
        res = {}
        for lead in self.browse(cr, uid, ids, context=context):
            res[lead.id] = {}
            val = 0.0
            for line in x_crm_lead.crm_lead_line:
                val += line.price_subtotal
            res[line.id]= val
        return res

    _columns = {
        'planned_revenue': fields.function(_amount_all,string='Receita Esperada',type='float',store=True),
        'crm_lead_line': fields.one2many('crm.lead.line','crm_lead_id','Produto da Oportunidade')
    }

class crm_lead_line(osv.Model):
    _name = 'crm.lead.line'
    _description = 'CRM Lead Line'

    def _amount_line(self, cr, uid, ids, name, arg, context=None):
        res = {}
        for record in self.browse(cr, uid, ids, context):
            res[record.id] = float(record.price_unit) * float(record.quantity)
        return res

    _columns = {
        'crm_lead_id': fields.many2one('crm.lead','Oportunidade',ondelete='cascade'),
        'product_id': fields.many2one('product.product','Produto'),
        'description': fields.text('Descricao'),
        'quantity': fields.float('Quantidade',digits=(12,2)),
        'price_unit': fields.float('Preco Unitario',digits=(12,2)),
        'price_subtotal': fields.function(_amount_line,string='Subtotal',type='float',store=True),
    }

Thank you in advance!