class-method

I have a method in my Customer class called save_from_row() . It looks like this: @classmethod def save_from_row(row): c = Customer() c.name = row.value('customer', 'name') c.customer_number = row.value('customer', 'number') c.social_security_number = row.value('customer', 'social_security_number') c.phone = row.value('customer', 'phone') c.save() return c When I try to run my script, I get this: Traceback (most recent call last): File "./import.py", line 16, in <module> Customer.save_from_row(row) TypeError: save_from_row() takes exactly 1 argument (2 given) I don't understand the mismatch in

I have a UIView that has many instances and each one of them has a UIRecognizer. When on of them is tapped I want to remove all the recognizers of the others. What I want it to get all the instances of the class and remove their recognizes. I know ManagedObjects has [Entity allObjects]; How can I create my "all objects" class method ? I have two ideas: 1/ Create a class array with all the instances static NSArray* instances; , register them when initializing, unregister when deallocating. The array should have only weak references, otherwise they will never be deallocated. 2/ NSNotification.

class Person def name puts "Dave" end end puts Person.object_id There are only two ways of accessing methods : 1) Someclass.method in case of class methods. #where Someclass is a class. 2) and Object.method when the method being accessed is a regular method declared inside a class. and Object is an instance of a class. It follows the pattern Object.method so, does it mean Person class is really an object? or object_id is a class method? The latter seems unlikely because class methods cannot be inherited into an instance. but when we do something like this : a = Person.new a.methods.include?(

Following compiles perfectly fine: struct MyClass { template<typename SameName> void foo (SameName* p); }; struct SameName {}; template<class SameName> void MyClass::foo (SameName* p) {} However, if we enclose MyClass and SameName inside some class Outer then the template function defined outside, fails to compile. struct Outer { /* paste here `MyClass` & `SameName` from above */ }; template<class SameName> void Outer::MyClass::foo (SameName* p) {} // <--- error here // ^^^^^ The g++ (03-14) error is weird: error: prototype for ‘void Outer::MyClass::foo(Outer::SameName*)’ does not match any in

I have a series of "policy" objects which I thought would be convenient to implement as class methods on a set of policy classes. I have specified a protocol for this, and created classes to conform to (just one shown below) @protocol Counter +(NSInteger) countFor: (Model *)model; @end @interface CurrentListCounter : NSObject <Counter> +(NSInteger) countFor: (Model *)model; @end I then have an array of the classes that conform to this protocol (like CurrentListCounter does) +(NSArray *) availableCounters { return [[[NSArray alloc] initWithObjects: [CurrentListCounter class], [AllListsCounter

I have some code which I would like to pass instances or classes interchangeably. All I will do in that code is to call a method that I expect both classes and instances to have (the method go() in the example below). Unfortunately, I can't create a classmethod with the same name of a regular method... See example below. I initially expected the second call to produce an a instead of a b . Any advice on how to achieve this? Type "help", "copyright", "credits" or "license" for more information. >>> class A(object): ... def go(self): ... print "a" ... @classmethod ... def go(cls): ... print "b"