Custom Controller Method, Route, & ERB - ruby-on-rails

Question

I have a search form and I need to be able to filter based on whether or not pets are allowed, but I'm not sure how to accomplish this. I have setup a route, a controller method, and a button but none of that seems to be working.
listings_controller:
def pets_allowed
#listings = #listings.where(pets: true)
end
routes.rb:
get "pets_allowed" => "listings#pets_allowed"
html.erb file:
<div>
<%= link_to 'Pets Allowed', pets_allowed_path, :class => 'button btn-transparent' %>
</div>

Answer 1

Maybe you meant
def pets_allowed
#listings = Listing.where(pets: true)
end

Answer 2

This is a basic example of another way to do what I think you're aiming for (as per comments).
This adds a new action in your Listings controller that returns a filtered list of results based on the users input from the search form on your listings index page. The results are rendered using the same index template. The logic for checking/retrieving results can be modified based on what you want. If you just want a check box, only have a checkbox or a button that calls the action.
You could do similar logic but use ajax to return the results and render them on the index template using a partial.
This should give you enough information to google for examples/tutorials and try different ways of getting what you want.
Add a route:
# routes.rb
get 'pets_allowed', to: 'things#pets_allowed'
Add a new action:
# listings_controller.rb
# GET /things
# GET /things.json
def index
#listings = Listing.all
end
# Get /pets_allowed
def pets_allowed
#listings = Listing.where("name LIKE ? and pets = ?", "%#{params[:name]}%", params[:pets] )
render template: "listings/index", variable: #listings
end
Add a search form to your view:
# listings/index.html.erb
<h1>Listings</h1>
<%= form_tag('pets_allowed', method: 'GET' ) do %>
<%= label_tag :name %><br>
<%= text_field_tag :name %>
<br>
<%= label_tag :pets %><br>
<%= check_box_tag :pets, 't' %>
<br>
<%= submit_tag("Search") %>
<% end %>
<table>
<thead>
<tr>
<th>Listing name</th>
</tr>
</thead>
<tbody>
<% #listings.each do |listing| %>
<tr>
<td><%= listing.name %></td>
</tr>
<% end %>
</tbody>
</table>
<br>
<%= link_to 'New Listing', new_listing_path %>