Defining an instance method "name" about middleclass

[kikito]

Yep, @mpeterv is correct. There's another special property in subclasses: super.

When you create a class like so:

local Foo = class('Foo')

The name attribute is automatically set for that class:

assert(Foo.name == 'Foo')

Instances don't have this problem so you can use instance.name however you want (an instance method called name should work, but I am not 100% sure. Just name it something else if it gives you trouble).

I'm closing this down now, but reopen if you need more help.

[qaisjp]

foo is instantiated before you define Foo:name Move line 4 after the method creation and try again

…

On Thu, 6 Jul 2017, 12:38 p.m. kappe-c, ***@***.***> wrote: I just stumbled across the issue given in the title. I knew from the documentation that for each class a static variable name is defined but I wouldn't have guessed (and find it quite restricting) that this affects the namesapce of instance methods. Don't Class.sth and instance.sth have different look-up chains? Consider the following code sample. local class = require 'middleclass' local Foo = class 'Foo'local foo = Foo() print(Foo.name) --> Fooassert(foo.class.name == Foo.name) -- secure fallback to get static class membersprint(foo.name) --> nil -- Foo.static.name = 'Bar' -- has no effect function Foo:name() -- equivalent to function Foo.name(self) print('method "name" is called')end -- foo:name() -- attempt to call a nil value (method 'name')print(Foo.name) --> function: 0x123456print(foo.name) --> nil Is this a bug, intended, unavoidable? What could be a workaround if one really wanted a name method? (I know that using getName would be one solution.) — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#47>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AA4WaoqrISUrSNHz06dqhoyANX22Wg_Eks5sLMdBgaJpZM4OPg-H> .

[kappe-c]

foo is instantiated before you define Foo:name

I'm afraid that doesn't matter:

local class = require 'middleclass'

local Foo = class 'Foo'

function Foo:name() -- equivalent to function Foo.name(self)
	print('method "name" is called')
end

local foo = Foo()
foo:name() -- attempt to call a nil value (method 'name')
print(Foo.name) --> function: 0x123456
print(foo.name) --> nil (btw: that's an ordinary field that could have been set in the constructor)

[mpeterv]

name, static, and subclasses properties of a class (plus some private ones starting with underscores) and class property of an instance are special, they don't live in normal namespaces.