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This way you can split out the different validation steps into instance methods and get some separation of concern going.For instance, this here is typically it's own method, call this simply Now that you have this, if you ever want to extend this class to also look for if the IP is localhost or if it is a broadcast address, it is pretty easy to do this. You can also tell exactly which one of your validation rules was broken in the validation of the IP address string. Most of the answers (except that of Michael Konietzka) are wrong: 10.8, for instance, is a valid IP4 address (a shorthand for 10.0.0.8).The basic idea is to take a sub-string and than validate it.Please note that I switch x and y, since the start of a sub-string will always be the end of the last one plus 1.
If you create a new object with an explicit primary-key value that already exists in the database, Django will assume you’re changing the existing record rather than creating a new one. If you’re using Postgre SQL, the sequence associated with the primary key might need to be updated; see The one gotcha here is that you should be careful not to specify a primary-key value explicitly when saving new objects, if you cannot guarantee the primary-key value is unused.It behaves like a normal attribute on the model, but is actually an alias for whichever attribute is the primary key field for the model.