My Filterrific filter don't work

I try to implement Filterrific on my application to filter Users. I need to filter by mother_tongue, locality and availability start_time. But it doesn't work. There is no errors but there is no filtering...

Model user.rb :

  filterrific(
default_filter_params: {},
available_filters: [
  :search_query,
  :search_query,
  :with_start_time_gte
]
)

scope :search_query, lambda { |query|
return nil  if query.blank?

terms = query.downcase.split(/\s+/)

terms = terms.map { |e|
  (e.gsub('*', '%') + '%').gsub(/%+/, '%')
}
num_or_conditions = 2
where(
    terms.map {
      or_clauses = [
          "LOWER(users.mother_tongue) LIKE ?",
          "LOWER(users.locality) LIKE ?"
      ].join(' OR ')
      "(#{ or_clauses })"
    }.join(' AND '),
    *terms.map { |e| [e] * num_or_conditions }.flatten
)
}
scope :with_start_time_gte, lambda { |ref_date|
where('availability.start_time >= ?', ref_date)
}

Users_controller.rb :

 def index
@filterrific = initialize_filterrific(
  User,
  params[:filterrific]
  #persistence_id: 'shared_key',
  #default_filter_params: {},
  #available_filters: [],
) or return
@users = @filterrific.find.page(params[:page])

# Respond to html for initial page load and to js for AJAX filter updates.
respond_to do |format|
  format.html
  format.js
end

rescue ActiveRecord::RecordNotFound => e
  # There is an issue with the persisted param_set. Reset it.
  puts "Had to reset filterrific params: #{ e.message }"
  redirect_to(reset_filterrific_url(format: :html)) and return
end

index.html.erb :

<% provide(:title, 'Liste des utilisateurs') %>
<h1>Liste des utilisateurs :</h1>

<%= form_for_filterrific @filterrific, html: { id: 'filterrific-no-ajax-auto-submit' } do |f| %>
<div>
  Langue :
  <%= f.text_field(
  :search_query,
  class: 'mother_tongue filterrific-periodically-observed'
) %>
</div>
<div>
  Ville :
    <%= f.text_field(
  :search_query,
  class: 'locality filterrific-periodically-observed'
) %>
</div>
<div>
  Date de départ :
    <%= f.text_field(:with_start_time_gte, class: 'js-datepicker') %>
</div>

<%= f.submit 'Rechercher' %>

<div>
  <%= link_to(
   'Reset filters',
  reset_filterrific_url,
) %>
</div>

<%= render_filterrific_spinner %>

_list.html.erb :

<div id="filterrific_results">

<div>
<%= page_entries_info users %>
</div>

<% @users.each do |user| %>
  <h1><%= user.fname %> <%= user.lname %></h1>
    <h2><%= user.mother_tongue %></h2>
  <center>
    <p><%= user.postal_code %> <%= user.locality %></p>

    <p><%= link_to "En savoir plus", user_path(user) %></p>
  </center>
<% end %>

I'm new on rails, so thank you for your help.