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Design Patterns web based applications [closed]
I am designing a simple web-based application. I am new to this web-based domain.I needed your advice regarding the design patterns like how responsibility should be distributed among Servlets, criteria to make new Servlet, etc.
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Is there a way to get a collection of all the Models in your Rails app?
...use Ruby reflection to search for every classes that extends ActiveRecord::Base. Don't know how you can list all the classes though...
EDIT: Just for fun, I found a way to list all classes
Module.constants.select { |c| (eval c).is_a? Class }
EDIT: Finally succeeded in listing all models without ...
Using Sass Variables with CSS3 Media Queries
... SASS grabbed all rules and properties in your stylesheet containing your $base_width variable and copied/changed them accordingly.
Since it won't work automatically you could do it by hand like this:
@media screen and (max-width: 1170px)
$base_width: 960px // you need to indent it to (re)se...
Why should I declare a virtual destructor for an abstract class in C++?
I know it is a good practice to declare virtual destructors for base classes in C++, but is it always important to declare virtual destructors even for abstract classes that function as interfaces? Please provide some reasons and examples why.
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Modify file in place (same dest) using Gulp.js and a globbing pattern
...as the globbed path is used for the dest as well. Simply pipe to the same base directory you're globbing the src from, in this case "sass":
gulp.src("sass/**/*.scss")
.pipe(sass())
.pipe(gulp.dest("sass"));
If your files do not have a common base and you need to pass an array of paths, this ...
Why do I have to access template base class members through the this pointer?
...le in template <typename T> struct Foo : T::A {};, T::A is used as a base class and hence is unambiguously a type. If Foo is instantiated with some type that has a data member A instead of a nested type A, that's an error in the code doing the instantiation (phase 2), not an error in the templ...
Overriding fields or properties in subclasses
I have an abstract base class and I want to declare a field or a property that will have a different value in each class that inherits from this parent class.
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Change branch base
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Use --onto for that:
git rebase --onto newBase oldBase feature/branch
Given your case:
git checkout PRO # Just to be clear which branch to be on.
git rebase --onto master demo PRO
Basically, you take all the commits from after demo up to PRO, and ...
Calling a base class's classmethod in Python
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super(Derived, cls).do(a)
This is how you would invoke the code in the base class's version of the method (i.e. print cls, a), from the derived class, with cls being set to the derived class.
share
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Copy constructor for a class with unique_ptr
...ove strategy works for simple types like int. If you have a unique_ptr<Base> that stores a Derived, the above will slice.
– Yakk - Adam Nevraumont
Apr 16 '13 at 18:35
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