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Mehdi Belatrous

Hi everyone,

I'm developping a small module for Odoo 8, and I need a field to be filled with current date.
I've been trying to do this through my python file but it raises this error "Expected singleton: test.test()"

On the forum I found this( https://www.odoo.com/fr_FR/forum/aide-1/question/expected-singleton-71132 ) topic but I couldnt get it. Below is my code. Thank you in advance for any help.

import time
class Test(models.Model):
    _name = 'test.test'   
    @api.one
    def a_fun(self):
        self.date=time.strftime("%d/%m/%Y")       
    date = fields.Date(default=a_fun)

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Mehdi Belatrous
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To solve my problem I used date = fields.Date(default=fields.datetime.now() , readonly=True),

but if someone can give me a few explanation about the error I raised and the use of decorators in Odoo, I'll be very glad ! (I read the documentation, but I really dont get it, I'm quite new to Python programming).

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Axel Mendoza
Best Answer

Hi Belatrous

The difference is that the argument 'default' needs a value or a function that return a value to use it as default value for the field, fields.datetime.now() returns a value, and in your first attempt your a_fun method doesn't return a value, you could make it work like this:

@api.model
def a_fun(self):
    return time.strftime("%d/%m/%Y")

Hope this help you

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Mehdi Belatrous
Author

I'm still stuck on this issue, I've tried using your solution and Alex's too, it works if I have only one record but if there are more; I've again this issue. I've tried with@api.model and @api.multi. Below my code. Any idea ?

class Test(models.Model):

_name = 'test.test'

computed_date = fields.Datetime(compute='compute_date')

@api.multi

def compute_date(self):

self.computed_date=fields.datetime.now()

Axel Mendoza

that is because you are mixin things, default argument is not the same as compute argument, for the compute argument you could do it like this:

@api.multi

def compute_date(self):

for elem in self:

elem.computed_date=fields.datetime.now()

but with that you will not get default values, just values in already created records

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Alex
Best Answer

There is a difference between default and compute ,you can use api.one and api.multi in case of compute but no in case of default ,in case of default use api.model

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Mehdi Belatrous
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I'm new to Odoo, so I dont understand what "compute" means. I've seen it in api documentation but I dont know what it is , can you help me please ?