Rails filter with button or link_to using Ransack

Question

I am developing a rails application using the Ransack gem and below is the code that I have written so far to filter my database which works like a charm. Now what I am tryi

Answer 1

Replace

<%= link_to "All",q: {color_cont: 'white'}, :class => 'link-sort', :remote => true, :method => :post %>

with

<%= link_to "All",q: {color_cont: 'white', brand_id_eq: params[:q][:brand_id_eq]}, :class => 'link-sort', :remote => true, :method => :post %>

Here assumption is

Once the database is first filtered with a brand name, then I would like users to be able to further filter the database by clicking one of the buttons which has a pre-defined filter value