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ruby-on-railsform-helpers

Rails selector which has options a set of numbers

I want to make a form in which the user can select a number between 1 and 30. I am trying to do something like this:

<%= f.select("@currency.neural_network", "prediction_days", [1..30]) %>

However, I am getting the below error.

Failure/Error: click_link 'Show'
     ActionView::Template::Error:
       undefined method `merge' for [1..30]:Array

The code for the entire form is:

<%= form_for @currency.neural_network do |f| %>
    <%= f.label "Days" %><br />
    <%= f.select("@currency.neural_network", "prediction_days", [1..30]) %>
    <%= f.submit "Predict", class: "btn btn-primary" %>
<% end %>
Solution

  • Take a look at the documentation for select. Assuming you want prediction_days to be passed to your controller as a value between 1 and 30, and prediction_days is an attribute of a neural_network object, then the following should work for you:

    <%= f.select(:prediction_days, options_for_select(1..30)) %>