Here’s my model. What I want to do is generate a new file and overwrite the existing one whenever a model instance is saved: I see lots of documentation about how to upload a file. But how do I generate a file, assign it to a model field and have Django store it in the right place? Answer You want
Tag: django
Django – Template display model verbose_names & objects
I need to display several models name & objects in a template Here is my view And my template Of course objs._meta.verbose_name doesn’t work Is there a way to access to this verbose name without having to create a function for each model or to assign the value from the view for each model ? Answer F…
How to Query model where name contains any word in python list?
Aim to Achieve: I want all objects where name attribute contains any word from the list. I have: For example: if name=”this is word2″: Then object with such a name should be returned since word2 is in the list. Please help! Answer You could use Q objects to constuct a query like this: Edit: is a f…
how to substract two datetime.time values in django template,and how to format a duration as hour,minutes
In a django app ,I am sending a list of Entry objects to the template.Each Entry object has a start, end times which are datetime.time values(from TimeFields on the form).While listing the Entry objects,I need to show the duration for each entry.Putting a duration field in model seemed to be reduntant since ,…
In django, how to delete all related objects when deleting a certain type of instances?
I first tried to override the delete() method but that doesn’t work for QuerySet’s bulk delete method. It should be related to pre_delete signal but I can’t figure it out. My code is as following: But this method seems to be called infinitely and the program runs into a dead loop. Can someon…
Execute code when Django starts ONCE only?
I’m writing a Django Middleware class that I want to execute only once at startup, to initialise some other arbritary code. I’ve followed the very nice solution posted by sdolan here, but the “Hello” message is output to the terminal twice. E.g. and in my Django settings file, I’…
Paginator for inline models in django admin
I have this simple django model consisting of an sensor and values for the specific sensor. The number of values per Pyranometer is high (>30k). Is it somehow possible to paginate PyranometerValues by a specific day or generell apply a paginator to the admin inline view? Answer Have you checked raw_id_fiel…
Python Django Templates and testing if a variable is null or empty string
I am pretty new to django, but have many years experience coding in the java world, so I feel ridiculous asking this question – I am sure the answer is obvious and I am just missing it. I can’t seem to find the right way to query this in google or something… I have searched through the djang…
How to have Calendar thing in Django date field
I have this Datetime field in Django But I want the Calendar to pop up. In docs, they say to write this Now I have a few problems: Where to declare this class and how to use it I don’t have pretty.css , animation.css , how can get it Do I need to do programming for it?? Answer The files
How to add the current query string to an URL in a Django template?
When I load a page, there is a link “sameLink” that I want to append to it the query string of its containing page. I have following URL: How can I do that? Answer To capture the QUERY_PARAMS that were part of the request, you reference the dict that contains those parameters (request.GET) and url…