helper_method中的控制器未显示Ruby on Rails视图

Question

I have this view new.html.erb :

<h1>EVALUATING MODEL PERFORMANCE</h1>
<%= test %>
<%= "#{controller_name}/#{action_name}" %>

The controller is articles_controller.rb :

class ArticlesController < ApplicationController
    def new
    y = R.pull "capture.output(summary(rnorm(10)))"
    puts y
    end

    helper_method :test
    def test
    sample_size = 10
    R.eval "x <- rnorm(#{sample_size})"
    R.eval "summary(x)"
    R.eval "sd(x)"
    y = R.pull "capture.output(summary(rnorm(10)))"
    puts y
    end
end

Why does the output (shown here: ruby in web ) does not include the results of the test method?

Answer 1

you need to return y at the end of your test method. puts doesnt actually return anything (it returns nil ), it just prints to the console. so if puts is the last thing in your method, it will be returned. but since it doesnt return anything, there is nothing for your view to display.

by returning y , your view will be able to display the string (though i expect the formatting to be all over the place).