Sorting the result - sunspot rails

问题

I have two models, School model and Price model. Every school has a price. Right now I get back the result I want, but I like to implement a sorting function that sorts the highest price for a school and the lowest.

School-controller:

class SchoolsController < ApplicationController
def index
 @query = params[:search]
 @search = School.search(:include => [:price] do 
   fulltext params[:search]
     paginate :page => params[:page], :per_page => 7
   end
 @results = @search.results
end
end

School-model:

class School < ActiveRecord::Base
 has_one :price
 # sunspot search
  searchable do
   text :name, :locality
  end
end

Index - view

<ul>
   # Cheapest price
   <li><span class="label label-ord">Show cheapest price <%= @query %></span></li>
   # Highest price
   <li><span class="label label-ord">Show highest price <%= @query %></span></li>
</ul>
<% for result in @results %>
   <tr>
    # School name, from the school-model
    <td><h3><%= link_to result.name, result %></h3></td>
    # School price, from the price-model
    <td><h3><%= result.prices.min %> kr</h3></td>
   </tr>
<% end %>

How can I sort the highest and lowest price; should I use facets or methods? How do I do that?

回答1:

I don't know sunspot really well, so i'm a bit guessing around here... Please consider what follows as a lead or advice, because i'm definitely not sure this will work.

The first step is to index the price for each school :

class School < ActiveRecord::Base
  has_many :prices

  searchable do
    text :name, :locality
    double :price do
      # 'value' is just an example, use the relevant field on the price object
      price.value if price.present? 
    end
  end
end

Then reindex. Now you can order your searches:

 @search = School.search( include: [:prices] ) do 
   fulltext params[:search]
   paginate page: params[:page], per_page: 7
   order_by :price, :asc # or use any param of your choice, 
                         # returned by a select tag for example
 end

Update

You can stick this logic in a class method.

class School < ActiveRecord::Base
  def self.custom_search( text, page, order = :asc )
    search( include: [:prices] ) do 
      fulltext text
      paginate page: page, per_page: 7
      order_by :price, order
    end
  end
end

then call with:

School.custom_search params[:search], params[:page]
# or :
School.custom_search params[:search], params[:page], :desc

来源：https://stackoverflow.com/questions/14541528/sorting-the-result-sunspot-rails