Rails/検索フォーム

#index.html.erb
<%= form_tag('/articles', method: 'get') do %>
  <%= label_tag(:name_key, 'Search name:') %>
  <%= text_field_tag(:name_key) %>
  <%= submit_tag('Search') %> <%= link_to 'Clear', articles_path %>
<% end %>

#articles_controller.rb
def index
  if params[:name_key]
    @articles = Article.where('name LIKE ?', "%#{params[:name_key]}%")
  else
    @articles = Article.all
  end
end