Rails partial view repeat display - ruby-on-rails

Question

Here is part of my index.html
<div class="col-md-8">
<% #books.each do |book| %>
<div class="row">
<div class="col-md-4">
<%= image_from_amazon(book.amazon_id) %>
</div>
<div class="col-md-8">
<h3 class = "text-info">
<%= book.title %>
</h3>
<br>
<em class ="text-muted">
written by <%= book.author %>
</em>
<br>
<br>
<p>
<%= book.description %>
</p>
<% book.genres.each do |genres| %>
<span class="label label-primary">
<%= genres.name %>
</span>
&nbsp
<% end %>
</div>
</div>
<% end %>
</div>
Basically, it will display 3 books, and it works fine.
Then, I move that code into _book.html.erb and edit above code into
<%= render #books %>
However, it repeat 3 times, that is, it display 9 books. And the sequence is [1st,2nd,3rd] [1st,2nd,3rd] [1st,2nd,3rd] like this picture.
Update
update index.html.erb
<div class="clearfix">
<div class="col-md-12">
<%= render #books %>
<div class="col-md-4">
<h3>Genre (Click to filter books)</h3>
<br>
<li>
<span class = 'label label-danger'>
<%= link_to "No filter" ,books_path, style: 'color:#FFFFFD' %>
</span>
<br>
<br>
</li>
<% #genres.each do |genres| %>
<li>
<span class = 'label label-primary' style="color:#FFFFFD">
<%= link_to genres.name ,books_path(filter: genres.name),style: 'color:#FFFFFD' %>
</span>
</li>
<br>
<% end %>
</div>
</div>
<!-- clearfix -->
</div>

Answer 1

Try the following:
<div class="col-md-8">
<%= render #books %>
</div>
And make sure <% #books.each do |book| %> and its <% end %> tag aren't in the partial.
Rendering Collections Docs
Edit
#index.html.erb
<div class="col-md-8">
<%= render #books %>
</div>
# _book.html.erb
<div class="row">
<div class="col-md-4">
<%= image_from_amazon(book.amazon_id) %>
</div>
<div class="col-md-8">
<h3 class = "text-info">
<%= book.title %>
</h3>
<br>
<em class ="text-muted">
written by <%= book.author %>
</em>
<br>
<br>
<p>
<%= book.description %>
</p>
<% book.genres.each do |genres| %>
<span class="label label-primary">
<%= genres.name %>
</span>
&nbsp
<% end %>
</div>
</div>