I'm a newby in Rails, and trying to use methods in html.erb instead of writing the same query several times. I've started with "Hello, World"; but, I couldn't even manage to do this. 
What I do;

```
   def Say() 
  "Hello World" 
   end

```

in app/models/sample.rb (sample is the name of the page by the way) and

```
 <% Say   %>

```

in views/samples/index.html.erb. The problem is, obviously, I cannot see anything like "Hello World" on the page. What should I do?