TLDR - Basic search field with Ruby on Rails

  def index    if params[:email]      @users = User.where('email ILIKE ?', "%#{params[:email]}%").order(created_at: :desc) #case-insensitive    else      @users = User.all.order(created_at: :desc)    end  end

.form-inline.my-2.my-lg-0  = form_tag(courses_path, method: :get) do    .input-group      = text_field_tag :title, params[:title], autocomplete: 'off', placeholder: "Find a course", class: 'form-control-sm'      %span.input-group-append        %button.btn.btn-primary.btn-sm{:type => "submit"}          %span.fa.fa-search{"aria-hidden" => "true"}

<%= form_tag(users_path, method: :get) do %>  <%= text_field_tag :email, params[:email], autocomplete: 'off', placeholder: "user email" %>  <%= submit_tag "Search" %><% end %>