How to implement model inheritance or polymorphic associations in Ruby on Rails?

In C#, the scope defines the accessibility of variables, methods, and types within certain parts of the program. It is a restriction on where an identifier can be used.

Main scope types:

• Block scope: Variables declared inside curly braces { } are only accessible within that block.
• Method scope: Variables and parameters declared inside a method are only accessible within that method.
• Class/struct scope: Members of a class or struct (fields, properties, methods) are accessible depending on access modifiers (public, private, protected, internal).
• Namespace scope: Types declared within a namespace are accessible within that namespace and other namespaces where using is used.
• Assembly scope: Types with the internal modifier are accessible only within the current assembly.

Example of block scope:

public void ExampleMethod()
{
    int x = 10; // x is only accessible within ExampleMethod
    if (x > 5)
    {
        int y = 20; // y is only accessible within the if block
        Console.WriteLine(y);
    }
    // Console.WriteLine(y); // Error: y is not accessible here
}