[英]ruby module as collection of methods
I have a rails app that loads lots of data from some java services. 我有一个rails应用程序,从一些Java服务加载大量数据。 I'm writing a module that will allow me to populate some select boxes with this data and I'm trying to include these properly so I can reference them in my views.
我正在编写一个模块,允许我使用这些数据填充一些选择框,我正在尝试正确包含这些,以便我可以在我的视图中引用它们。 Here's my module
这是我的模块
module FilterOptions
module Select
def some_select
return "some information"
end
end
end
My idea was to include FilterOptions in my application_helper, and I thought I could then reference my methods using Select::some_select
This is not the case. 我的想法是在我的application_helper中包含FilterOptions,然后我想我可以使用
Select::some_select
引用我的方法。 Select::some_select
并非如此。 I have to include FilterOptions::Select
then I can reference the method some_select
on its own. 我必须
include FilterOptions::Select
然后我可以自己引用some_select
方法。 I don't want that though as I think it's a bit confusing to someone that may not know that some_select
is coming from my own module. 我不希望这样,但我认为对于那些可能不知道
some_select
来自我自己的模块的人来说有点混乱。
So, how do I write methods of a module that are like public static methods so I can include my main module, and reference my methods using the sub-module namespace like Select::some_select
那么,我如何编写类似公共静态方法的模块方法,以便我可以包含我的主模块,并使用子模块命名空间引用我的方法,如
Select::some_select
If you define module methods within the context of the module itself, they can be called without import: 如果在模块本身的上下文中定义模块方法,则可以在不导入的情况下调用它们:
module FilterOptions
module Select
def self.some_select
return "some information"
end
end
end
puts FilterOptions::Select.some_select
# => "some information"
It is also possible to import one module, and not import the next, refer to it by name instead: 也可以导入一个模块,而不导入下一个模块,而是通过名称引用它:
include FilterOptions
puts Select.some_select
# => "some information"
module_function causes a module function to be callable either as an instance method or as a module function: module_function使模块函数可以作为实例方法或模块函数调用:
#!/usr/bin/ruby1.8
module Foo
def foo
puts "foo"
end
module_function :foo
end
Foo.foo # => foo
Foo::foo # => foo
include Foo
foo # => foo
Sometimes you want every method in a module to be a "module function," but it can get tedious and repetitive to keep saying "module_function" over and over. 有时你希望模块中的每个方法都是一个“模块函数”,但是一遍又一遍地说“module_function”会变得乏味和重复。 In that case, just have your module extend itself:
在这种情况下,只需让您的模块扩展自己:
!/usr/bin/ruby1.8
module Foo
extend self
def foo
puts "foo"
end
end
Foo.foo # => foo
Foo::foo # => foo
include Foo
foo # => foo
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