Here's my model :

 from openerp import models, fields, api, tools

class Searches(models.Model):

	_name = 'user.search'

	search = fields.Char('Searches made by users',required=True)

	nb_searches = fields.Integer('Number of searches for this phrase',required=True)

	def a_function(sef,cr,uid,context=None):
		return None

And when I try to search in it :

self.search(cr, uid, []) 

I've got the following error :

AttributeError: 'user.search' object has no attribute '_ids'

What's wrong ? The user_search table have an 'id' attribute ... I don't what what I did wrong.