Question 97375 in Nginx Question posted in
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datetime.date.today() always returns the same value – Nginx

I have a Django project. I use nginx + gunicorn.
The views.py file has a combined_data() function that creates and returns an HTML page. As you can see, I am passing the objects in ‘rows’ and the current date in ‘time’.

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A function that returns objects looks like this

enter image description here

The problem is that in this function, reporting_date always gets the value it got the first time it was called.
For example, I do "sudo systemctl restart gunicorn" and open this page in the browser. reporting_date will be equal to today. If I open the page tomorrow, reporting_date will not change its value.

Initially, I assumed that datetime.date.today () does not work correctly, so I added the ‘time’ parameter to views.py (first screen), but the date is always correct there.
Then I thought that the default value of the parameters of the get_combined() function (second screen) is somehow cached, so I added the r_int parameter, which receives a random value, but everything works correctly here. r_int always gets a new value.

Now, I have to call "sudo systemctl restart gunicorn" every day to make the page work properly ((

Any ideas how to fix this problem? Thanks

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2

Answers


  1. 0

    Instead of

    def get_combined(reported_date=datetime.datetime.today()):

    use

    def get_combined():
    reported_date = datetime.datetime.today()

    What I tried:-

    >>> def c(day = datetime.today()):
        print(day)

    
>>> c()
>>> 2022-10-27 15:44:57.593444
>>> c()
>>> 2022-10-27 15:44:57.593444

    >>> def c():
        day = datetime.today()
        print(day)

    
>>> c()
>>> 2022-10-27 15:56:02.459517
>>> c()
>>> 2022-10-27 15:56:04.630902

    As @OldBill mentioned: When you declare a default value for a function parameter it is evaluated once and not every time the function is called

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  2. 0

    The default value for the parameter reported_date is the value of the first time the function gets imported. You should do something like

    def get_combined(reported_date=None, ...):
    reported_date = reported_date or datetime.datetime.today()
    ...
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