Re: Generating a unique 10 digit ID for each model instance

Hi James, First of all thank you for all your detailed replies. You have a wealth of knowledge. I took your advice and chose the separated method. I decided to use 2 letters + 8 numbers because 3 letters can render results like 'SEX' and 'FUK'. I think I got it right. Here is my code:

Re: Generating a unique 10 digit ID for each model instance

James, I agree with you - after thinking about it for another day, your solution would be the best. Regards, Andréas 2017-10-23 10:51 GMT+02:00 James Schneider : > > > On Oct 22, 2017 9:29 AM, "Andréas Kühne" > wrote: > > Hi, > > When you

Re: Generating a unique 10 digit ID for each model instance

On Oct 22, 2017 9:29 AM, "Andréas Kühne" wrote: Hi, When you say "globally unique" - I am supposing you mean within your application? What you need to do is set a field to be the primary key, see : https://docs.djangoproject.com/en/1.11/topics/db/models/#

Re: Generating a unique 10 digit ID for each model instance

On Oct 22, 2017 4:36 PM, "Mark Phillips" wrote: I thought python's uuid.uuid4 guaranteed a unique value. Am I missing something? Mark >From a practical perspective, you are correct, uuid.uuid4() will create a unique value every time. There is no guarantee, though,

Re: Generating a unique 10 digit ID for each model instance

On Oct 22, 2017 8:52 AM, "Jack Zhang" wrote: Let's say I have a model called 'Dogs'. Users can create instances of Dogs. For every Dogs instance that is created, I want to assign a globally unique ID to it. The ID will be 3 capitalized letters followed by 7 numbers.

Re: Generating a unique 10 digit ID for each model instance

I thought python's uuid.uuid4 guaranteed a unique value. Am I missing something? Mark On Sun, Oct 22, 2017 at 3:58 PM, James Schneider wrote: > > > On Oct 22, 2017 12:29 PM, "Andréas Kühne" > wrote: > > Hi, > > I think you are correct with

Re: Generating a unique 10 digit ID for each model instance

On Oct 22, 2017 12:29 PM, "Andréas Kühne" wrote: Hi, I think you are correct with your pseudocode - you can do a Model.objects.filter(unique_code==random_code).count() - and then loop on that. It should work. I wouldn't do this, it can lead to a race condition

Re: Generating a unique 10 digit ID for each model instance

Hi, I think you are correct with your pseudocode - you can do a Model.objects.filter(unique_code==random_code).count() - and then loop on that. It should work. The reason why I thought you should use the signals is because thats how I have done the same things in the past. However, you can just

Re: Generating a unique 10 digit ID for each model instance

I need this 10-digit unique ID for every model instance so users can easily search up a specific model instance. It will be publicly displayed on the website, unlike a primary key which is usually hidden On Sunday, October 22, 2017 at 1:31:23 PM UTC-4, Avraham Serour wrote: > > The database

Re: Generating a unique 10 digit ID for each model instance

Hi Andréas, Yes, by globally unique I mean a unique 10-digit ID is assigned to every model instance of 'Dogs' within my application. This ID will be shown publicly on the website to allow easy search access to a specific model instance. I think you are right about creating a new field to

Re: Generating a unique 10 digit ID for each model instance

The database usually handles this and you don't need to worry, there are many corner cases and DB systems are able to handle them But they won't look like whatever format you would like, usually it is just a number Why do you need the IDs to look like that? On Oct 22, 2017 6:53 PM, "Jack Zhang"

Re: Generating a unique 10 digit ID for each model instance

Hi, When you say "globally unique" - I am supposing you mean within your application? What you need to do is set a field to be the primary key, see : https://docs.djangoproject.com/en/1.11/topics/db/models/#automatic-primary-key-fields However - it would be simpler to use the standard primary

Generating a unique 10 digit ID for each model instance

Let's say I have a model called 'Dogs'. Users can create instances of Dogs. For every Dogs instance that is created, I want to assign a globally unique ID to it. The ID will be 3 capitalized letters followed by 7 numbers. E.g. ABC1234567, POZ2930193 What is the easiest way to go about