Question

I am using plugin Kaminari for pagination. I am Ajaxifing my application and I encountered a problem. I have a form with paginated data plus form for filtering data (both via Ajax). At start pagination works good, and the url’s for particular pages are ‘/admin/rooms?page=X’. After ajax filtering those url’s change for ‘/admin/rooms/filter?page=X’.
I can specify the action to trigger when paginating by:

<%= paginate @rooms, :params => {:controller => 'rooms', :action => 'index'}, :remote => true %>

but then variable @rooms gets resetted in index and I paginate unfiltered data again.

Any ideas how could I fix it?

Here’s some code

• rooms_controller.rb:

  class Admin::RoomsController < AdminController
  def index
          @rooms = Room.all
          @rooms = Kaminari.paginate_array(@rooms).page(params[:page]).per(5)
          @filter_values = [['Room number', 'room_number'], ['Person count', 'person_count'], ['Room class', 'room_class']]
  end
  
  def filter
          case params[:filter_by]
          when 'room_number'
                  @rooms = Room.find(:all, :conditions => ["CAST(room_number AS VARCHAR) LIKE ?", "#{params[:filter_value]}%"])
          when 'person_count'
                  @rooms = Room.find(:all, :conditions => ["person_count LIKE ?", "#{params[:filter_value]}%"])
          else
                  @rooms = Room.joins(:room_class).where("lower(class_name) LIKE '#{params[:filter_value]}%'")
          end
  
          @rooms = Kaminari.paginate_array(@rooms).page(params[:page]).per(5)
          respond_to do |format|
                  format.html { redirect_to admin_rooms_path }
                  format.js
          end
  end
  

• index.html.erb:

  <%= label_tag 'Filter:  ' %>
  <%= form_tag(filter_admin_rooms_path, :remote => true) do %>
          <%= select_tag :filter_by, options_for_select(@filter_values) %>
          <%= text_field_tag :filter_value %>
          <%= submit_tag 'Filter', :disable_with => 'Filtering..' %>
  <% end %>
  
  ...
  
  <div id="rooms_list">
          <%= render 'admin/rooms/shared/rooms_list' %>
  </div>
  

• _rooms_list.html.erb:

  <div id="paginator">
          <%= paginate @rooms, :remote => true %>
  </div>
  <table class="table_listing" style="width: 60%">
          ...
  </table>
  

Answer 1

Problem solved by passing parameters again to index and forcing paginate to route to ‘rooms#index’, not the current page (not visible cause of Ajax though).

• _rooms_list.html.erb:

  <%= paginate @rooms, :params => {:controller => 'rooms', :action => 'index'}, :remote => true %>
  

Parametrs are passed to index by GET from the present params variable.

• rooms_controller.rb:

  def index
          if params[:filter_value].nil?
                  @rooms = Room.all
          else
                  @rooms = test_filter(params[:filter_value])
          end
  
          @rooms = Kaminari.paginate_array(@rooms).page(params[:page]).per(5)
          @errors = flash[:errors] || []
          @filter_values = [['Room number', 'room_number'], ['Person count', 'person_count'], ['Room class', 'room_class']]
  end
  
  def filter
          case params[:filter_by]
          when 'room_number'
                  @rooms = Room.find(:all, :conditions => ["CAST(room_number AS VARCHAR) LIKE ?", "#{params[:filter_value]}%"])
          when 'person_count'
                  @rooms = Room.find(:all, :conditions => ["person_count LIKE ?", "#{params[:filter_value]}%"])
          else
                  @rooms = Room.joins(:room_class).where("lower(class_name) LIKE '#{params[:filter_value]}%'")
          end
  
          @rooms = Kaminari.paginate_array(@rooms).page(params[:page]).per(5)
          params[:authenticity_token] = nil
          params[:commit] = nil
  
          respond_to do |format|
                  format.html { redirect_to admin_rooms_path }
                  format.js
          end
  end
  
  def test_filter(val)
          rooms = Room.find(:all, :conditions => ["CAST(room_number AS VARCHAR) LIKE ?", "#{val}%"])
          rooms
  end
  

test_filter is to remove/rename of course. I nil some parameter that I think shouldn’t be passed in params to the next page when paginate.