instance

I'm developing a site with codeigniter. Now, normally when you use a class in codeigniter, you basically use it as if it were a static class. For example, if I head a model called 'user', I would first load it using $this->load->model('user'); and than, I could invoke methods on that user class like $this->user->make_sandwitch('cheese'); in the application that I'm building, I would like to have one UserManagement class, which uses a class called 'user'. so that, for example I could $this->usermanager->by_id(3); and this would return an instance of the user model where the id is 3. What's the

The compiler does not let a static method call a non static method. I understand it does this because a not static method usually ends up using an instance variable. But does it make sense to have a non static method which does not use an instance variable. If we have a behavior which does not affect or isn't affected by the instance state , shouldn't such a method be marked as static. Often times, no. If the method doesn't touch any instance state, there's no reason to tie it to an instance. Of course, static methods can't be inherited or overridden, so that's one obvious time that you would

I have a question regarding best practices using docker containers. I need one database for each application I develop. Now my question is whether I should use one mysql docker instance with multiple databases inside or should I create one instance for each database. The disadvantage I see with creating one instance per database is that I can't have a user which has access to all database. I know this is a pro for security reasons but when I try to backup from a client than I need to go in every instance for backup up. And isn't multiple instance using to much overhead of resources (although

I want to understand arguments of the constructor __init__ in Python. class Num: def __init__(self,num): self.n = num def getn(self): return self.n def getone(): return 1 myObj = Num(3) print myObj.getn() RESULT: 3 I call the getone() method: print myObj.getone() RESULT: Error 'getone()' takes no arguments (1given). So I replace: def getone(): return 1 with def getone(self): return 1 RESULT:1 This is OK. But getone() method needs no arguments. Do I have to use meaningless argument? stderr In Python: Instance methods: require the self argument. Class methods: take the class as a first argument.

I have a class that accepts a generic type , and I want to override the equals method in a non-awkward way (i.e. something that looks clean and has minimal amount of code, but for a very general use case). Right now I have something like this: public class SingularNode<T> { private T value; @SuppressWarnings("unchecked") @Override public boolean equals(Object other){ if(other instanceof SingularNode<?>){ if(((SingularNode<T>)other).value.equals(value)){ return true; } } return false; } } Which, I'm guessing, is pretty flawed - I'm doing a cast to SingularNode<T> on the other object, which

I am new to Laravel. As per my research on this framework I find it quite useful for my projects. However I am facing difficulty in customizing it to use a single instance of Laravel framework for multiple projects. I do not want to follow the multi site approach as available in Laravel i.e., using directory structure in models and controllers for projects because I won't be able to push my project related changes in a single step in Git. I want something like this. common Laravel framework (having common libraries and vendor files. Also having common functionalities used by different projects