Filter products by distributor

app/models/spree/taxon_decorator.rb

@@ -0,0 +1,8 @@
+Spree::Taxon.class_eval do
+  # Indicate which filters should be used for this taxon
+  def applicable_filters
+    fs = []
+    fs << Spree::ProductFilters.distributor_filter if Spree::ProductFilters.respond_to? :distributor_filter
+    fs
+  end
+end

app/views/spree/shared/_filters.html.erb

@@ -0,0 +1,28 @@
+<% filters = @taxon ? @taxon.applicable_filters : [Spree::ProductFilters.distributor_filter] %>
+<% unless filters.empty? %>
+  <%= form_tag '', :method => :get, :id => 'sidebar_products_search' do %>
+    <% params[:search] ||= {} %>
+    <%= hidden_field_tag 'per_page', params[:per_page] %>
+    <% filters.each do |filter| %>
+      <% labels = filter[:labels] || filter[:conds].map {|m,c| [m,m]} %>
+      <% next if labels.empty? %>
+      <div class="navigation" data-hook="navigation">
+        <span class="category"> <%= filter[:name] %> </span>
+        <ul class="filter_choices">
+          <% labels.each do |nm,val| %>
+            <% label = "#{filter[:name]}_#{nm}".gsub(/\s+/,'_') %>
+            <li class="nowrap">
+              <input type="checkbox"
+                     id="<%= label %>"
+                     name="search[<%= filter[:scope].to_s %>][]"
+                     value="<%= val %>"
+                     <%= params[:search][filter[:scope]] && params[:search][filter[:scope]].include?(val.to_s) ? "checked" : "" %> />
+              <label class="nowrap" for="<%= label %>"> <%= nm %> </label>
+            </li>
+          <% end %>
+        </ul>
+      </div>
+    <% end %>
+    <%= submit_tag t(:search), :name => nil %>
+  <% end %>
+<% end %>

config/initializers/spree.rb

@@ -5,6 +5,11 @@
 #
 # In order to initialize a setting do:
 # config.setting_name = 'new value'
+
+
+require 'spree/product_filters'
+
+
 Spree.config do |config|
   # Example:
   # Uncomment to override the default site name.

lib/spree/product_filters.rb

@@ -0,0 +1,21 @@
+module Spree
+  module ProductFilters
+    if Spree::Distributor.table_exists?
+      Spree::Product.scope :distributor_any,
+        lambda {|*opts|
+          conds = opts.map {|o| ProductFilters.distributor_filter[:conds][o]}.reject {|c| c.nil?}
+          Spree::Product.joins(:distributors).conditions_any(conds)
+        }
+
+      def ProductFilters.distributor_filter
+        distributors = Spree::Distributor.all.map(&:name).compact.uniq
+        conds  = Hash[*distributors.map { |d| [d, "#{Spree::Distributor.table_name}.name = '#{d}'"] }.flatten]
+        { :name   => "Distributor",
+          :scope  => :distributor_any,
+          :conds  => conds,
+          :labels => (distributors.sort).map { |k| [k, k] }
+        }
+      end
+    end
+  end
+end

spec/lib/spree/product_filters_spec.rb

@@ -0,0 +1,10 @@
+require 'spec_helper'
+
+describe Spree::ProductFilters do
+  context "distributor filter" do
+    it "provides filtering for all distributors" do
+      3.times { create(:distributor) }
+      Spree::ProductFilters.distributor_filter[:labels].should == Spree::Distributor.all.map { |d| [d.name, d.name] }
+    end
+  end
+end