ruby on rails控制器类实例化ruby类吗？

Question

I am new to RoR .I want my controller to instatiate an existing class from lib .

Collect data in the form of a string and throw the result on the view.erb.Can I do that.

Do i have to create a new model object and that should that model object inturn call the lib class.

Answer 1

Not really sure what you want to do.

If you used a library class - a module for example - its automatically instantiated, when you use ' include '

If you just have a generic class , and you included it somewhere, then you already have the class object loaded and can call methods on it. Or you just create an instance manually with ' object = new MyClass '. And then call whatever you like on ' object '.

Whatever Information you collect inside the controller method, you can access in the view, when you place an '@'-Symbol before your variable. So if you want your show.html.erb look like this:

<h1>My String:</h1>
<%= @mystring %>

then you have to do something like this in your controller:

def show
  ...
  @mystring = MyClass.get_my_cool_string
  ...
end

Hope that helps...