CODEWITHSUNDEEP
ruby-on-railsruby-on-rails-5
DollarChills
DollarChills

Reputation: 1086

Loop multiple variable to form one table

What would be the best method to loop multiple variables into one table? Each variable could have one or more data points. For example, I wish to create something like this:

enter image description here

The following code example is only placing each item in a row.

<table class="table">
<% (@variable1 + @variable2 + @variable3).each do |data, v2, v3| %>
<tr>
    <% if data.is_a?(Variable1) %>
    <td><%= data.date %></td>
    <td><%= data.name %></td>
    <% elsif data.is_a?(Variable2) %>
    <td><%= data.date %></td>
    <td><%= data.name %></td>
    <% elsif data.is_a?(Variable3) %>
    <td><%= data.date %></td>
    <td><%= data.name %></td>
    <% end %>
</tr>
<% end %>
</table>

Upvotes: 0

Views: 341

Answers (1)

inveterateliterate
inveterateliterate

Reputation: 369

In this case, since you don't know how many records might be in each array, I would find out the greatest length of the arrays I have.

In your controller for this aciton could do something like: @max_length = [@variable_1, @variable_2, @variable_3].map(&:size).max

*Note: this assumes those variables are always arrays, even if they only have a length of 1.

Then in your view file you could do this:

<table class="table">
<% @max_length.times do |n| %>
  <tr>
    <td><%= @variable_1[n].try(:date) %></td>
    <td><%= @variable_1[n].try(:name) %></td>
    <td><%= @variable_2[n].try(:date) %></td>
    <td><%= @variable_2[n].try(:name) %></td>
    <td><%= @variable_3[n].try(:date) %></td>
    <td><%= @variable_3[n].try(:name) %></td>
  </tr>
<% end %>
</table>

This way, for the third row, for example, in columns 1 and 3 in your example there will be no values, but values for the second column, which has a third record, will appear.

Upvotes: 1

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