Using ransack for Rails application material dropdown select in view - ruby-on-rails

Question

Just need to know how you add ransack code in rails view as I m taking array list as category items and passing into the bootstrap material
the code for rails
on top of starting line search path code
<%= search_form_for #search, url: events_path do |f| %>
dropdown code dropdown without ransack which gives output with correct dropdown list
<div class="col">
<div class="dropdown" id="dropdown">
<p class="selected" id="selected"><span>Filter By Category1</span> <i class="material-icons">keyboard_arrow_down</i></p>
<ul class="dropdown-list" id="dropdown-list">
<a href="/events">
<li>All Events </li>
<% #category_list.each do |cat| %>
<li class="selected" id="list"> <%= cat.name %></li>
<% end %>
</ul>
</div>
</div>
I m trying to add ransack this does not display my list
<div class="col">
<div class="dropdown" id="dropdown">
<%= f.select :category_name_eq, class: "selected" %>
<ul class="dropdown-list" id="dropdown-list">
<a href="/events">
<li>All Events </li>
<% #category_list.each do |cat| %>
<li class="selected" id="list"> <%= cat.name %></li>
<% end %>
</ul>
</div>
</div>

Answer 1

you can do with list like this below, in case you allow blank option you should add include_blank: true as sample below
<div class="row form-group">
<%= f.label "Filter By Category1 <i class="mi md-18">arrow_downward</i>".html_safe, :class => 'col-form-label col-sm-3' %>
<div class="col-sm-9">
<%= f.select :category_name_eq,
#category_list.all.map { |cat| [cat.name, cat.name] },
{ include_blank: true }, { class: 'form-control' } %>
</div>
</div>