app/views/posts/_mini_preview.html.erb
<h4>
<%= link_to post, class: "post-mini-preview" do %>
<%= image_tag post.assets.cover.first.asset.url(:big) if post.assets.any? && post.assets.cover.any? %>
<span class="link-content">
<%= post.title %>
<small><%= post.subtitle %></small>
</span>
<% end %>
</h4>
<p class="post-meta"><%= post.published_date %> by <%= post.author %></p>