Custom ransacker predicates to query date range

index.html.erb

<%= search_form_for @q, url: production_status_changes_path, class: 'form-inline' do |f| %>
  <%=  f.label 'Create At' %>
  <%= f.search_field :created_at_beginning_of_day, class: 'form-control input-sm', 'datepicker' => true %>
  <%= f.search_field :created_at_end_of_day_lt, class: 'form-control input-sm',  'datepicker' => true %>
<% end %>

ransack.rb

# config/initializers/ransack.rb
#
# Custom ransack predicate to simplify query for date range
#
# See lib/ransack.rb in ransack gem
# See wiki https://github.com/activerecord-hackery/ransack/wiki/Custom-Predicates

Ransack.configure do |config|

  config.add_predicate 'beginning_of_day_gteq',
    arel_predicate: 'gteq',
    formatter: proc { |v| v.to_date.beginning_of_day },
    validator: proc { |v| v.present? },
    type: :string

  config.add_predicate 'end_of_day_lt',
    arel_predicate: 'lt',
    formatter: proc { |v| v.to_date.end_of_day },
    validator: proc { |v| v.present? },
    type: :string
end