Rails Table Partial

_cell.html.erb

<td width="<%= width %>">
  <% if cell %>
    <%= render partial: cell_partial, object: cell %>
  <% end %>
</td>

_row.html.erb

<tr>
  <%= render partial: 'cell', collection: row,
    locals: {
      cell_partial: cell_partial,
      width: "#{100/row.length}%",
    } %>
</tr>

_table.html.erb

<% # Nil elements in the rows will be rendered as empty cells %>

<table class="table table-no-hover table-bordered full-width table-show-empty">
  <tr><td colspan="100%">
    <%= render partial: table[:header_partial], object: table[:header],
      as: 'header' %>
  </td></tr>
  <%= render partial: 'row', collection: table[:rows],
    locals: { cell_partial: table[:cell_partial] } %>
</table>

_thing.html.erb

<div><%= thing.name %></div>
<div><%= thing.description %></div>

_thing_header.html.erb

<div>We have <%= count %> things</div>

controller.rb

things = Thing.all # My self descriptive model

@table = {
  header_partial: 'thing_header',
  header: {
    count: things.length,
  },
  cell_partial: 'thing',
  rows: groups_of(2, things),
}

groups_of.rb

def groups_of(length, arr)
  arr.reduce([[]]) do |group, elem|
    if group.last.length != length
      group.last.push(elem)
    else
      group.push([elem])
    end
    group
  end.tap do |groups|
    # Fill in gaps in last group with nils
    (groups.last.length...length).each do
      groups.last.push(nil)
    end
  end
end

index.css.scss

.table-show-empty {
  empty-cells: show;
}
.full-width {
  width: 100%;
}
.table-no-hover {
  tbody tr:hover td,
  tbody tr:hover th {
    background-color: transparent;
  }
}

For CSS:
table-bordered is from boostrap
table-no-hover was just my personal bug, might do nothing in isolation like this