How to refactor a simple long case statement - ruby

Question

So I created a drop-down form for my Sinatra project, and I want it to prepopulate the option. I was able to do that but it turned into a big case statement! Any Idea how to refactor this? Thanks!
get '/animes/:id/edit' do
if is_logged_in?
#anime = Anime.find_by_id(params[:id])
case #anime.rating
when 1
#oneselect = "selected"
when 2
#twoselect = "selected"
when 3
#threeselect = "selected"
when 4
#fourselect = "selected"
when 5
#fiveselect = "selected"
when 6
#sixselect = "selected"
when 7
#sevenselect = "selected"
when 8
#eightselect = "selected"
when 9
#nineselect = "selected"
when 10
#tenselect = "selected"
end
erb :'animes/edit'
else
redirect to '/'
end
end
And this is my .erb view file form!
<label for="rating">Rating:</label>
<select name="rating" id="rating" value="<%=#anime.rating%>">
<option value="10"<%=#tenselect%>>10 (Masterpiece)</option>
<option value="9"<%=#nineselect%>>9 (Great)</option>
<option value="8"<%=#eightselect%>>8 (Very Good)</option>
<option value="7"<%=#sevenselect%>>7 (Good)</option>
<option value="6"<%=#sixselect%>>6 (Fine)</option>
<option value="5"<%=#fiveselect%>>5 (Average)</option>
<option value="4"<%=#fourselect%>>4 (Bad)</option>
<option value="3"<%=#threeselect%>>3 (Very Bad)</option>
<option value="2"<%=#twoselect%>>2 (Horrible)</option>
<option value="1"<%=#oneselect%>>1 (Appalling)</option>
</select><br>

Answer 1

Apologies, I don't know anything about Sinatra, so this answer may be off base.
If I were looking at this code for myself, I would be thinking along the lines of doing something like (not tested, and my erb is a bit rusty):
<label for="rating">Rating:</label>
<%
options = [
[10, '10 (Masterpiece)'],
[9, '9 (Great)'],
[8, '8 (Very Good)'],
[7, '7 (Good)'],
[6, '6 (Fine)'],
[5, '5 (Average)'],
[4, '4 (Bad)'],
[3, '3 (Very Bad)'],
[2, '2 (Horrible)'],
[1, '1 (Appalling)']
]
%>
<select name="rating" id="rating">
<% options.each do |option| %>
<option value="<%= option[0].to_s %>"<%= #anime.rating == option[0] ? ' selected' : '' %>><%= option[1] %></option>
<% end %>
</select><br>
and then remove the case statement.

Answer 2

A useful object might be a map from the numerical rating to its string representation:
#ratings_map = {
1 => "1 (Appalling)",
2 => "2 (Horrible)",
3 => "3 (Very Bad)",
etc...
}
Rather than passing a separate variable for every rating (#oneselect, #twoselect, etc), you can simply use #anime itself for the selected value. Then, you can use the options_for_select helper function:
<label for="rating">Rating:</label>
<%= options_for_select(#ratings_map.map{|key, value| [value, key]}, #anime.rating) %>
Some useful documentation on the options_for_select helper:
https://apidock.com/rails/ActionView/Helpers/FormOptionsHelper/options_for_select
Edit:
My apologies, had my head in Rails land. If you're using Sinatra, you would have to explicitly require 'active_support' at the top of your Sinatra application for this solution to work. You would also want to make sure active_support is included in your Gemfile, and bundle install