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How to write a while loop in erb

I have a table with 2 column levels and a slot. each level can have many slots, but I created one table that simulates this case. example

level    |   slot
1        |   1
1        |   2
1        |   2
2        |   1
2        |   2
2        |   2

and in my erb template I want to create a table that will simulate this case by doing something like a grid. The problem so far, I want something like two loops to handle this situation. for each level, I get the number of slots and display them. the provided loop each

doesn't help. I am thinking of creating a variable that will keep track of the level variable and when it changes, I call the inner loop. but it doesn't work for me.

I also want to create a json object and make the slots imitators as an array inside a level variable, but I don't know where to start.

or is there a way to write a while loop in an erb pattern?

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3 answers


You can write a loop in ruby ​​(erb) like this:

<% loop do %>
  ...
  <% break if <condition> %>
<% end %>


See Is there a "do ... while" in Ruby?

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ERB is just ruby



<% @collection.each do |value| %>
  <%= value %>
<% end %>
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It can still be one table. I would create a variable called @slots

in your action and call .each

it in your view erb like this:

<% @slots.each do |slot| %>
 <% if ...  %>
  <div class="left-column">
    <%= slot.level %>
  </div>
  <div class="right-column">
    <%= slot.id %> <!-- or whatever var you you want --> 
  </div>
 <% else %>

 ...

 <% end %>
<% end %>

This way every new one slot

will be automatically added to the collection and you don't have to worry about changes tolevel

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