Ruby on Rails

Iterating over the @following_activities instance variable is giving me
errors for user.avatar.url and user.post. I don't understand why it's
not collecting all of the information from the user object.

<% if @following_activities.any? %>
<% @following_activities.each do |user| %>
<%= link_to(image_tag(user.avatar.url(:thumb), style:
'text-decoration: none;', class: 'round-image-50-trendy-warrior'),
user_path(user)) %>
<%= user.post.username %>
<%= user.post.body %>
<%= image_tag(user.post.photo.url(:medium), style: '') %>
<% end %>
<% else %>
<h1>No new posts</h1>
<% end %>

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