Provide searching by supplier or distributor via spree searcher class

app/models/spree/product_decorator.rb

@@ -5,4 +5,7 @@ Spree::Product.class_eval do
   attr_accessible :supplier_id, :distributor_ids
 
   validates_presence_of :distributors
+
+  scope :in_supplier, lambda { |supplier| where(:supplier_id => supplier) }
+  scope :in_distributor, lambda { |distributor| joins(:distributors).where('distributors.id = ?', distributor) }
 end

config/initializers/spree.rb

@@ -8,15 +8,15 @@
 
 
 require 'spree/product_filters'
-
+require 'open_food_web/searcher'
 
 Spree.config do |config|
-  # Example:
-  # Uncomment to override the default site name.
-  # config.site_name = "Spree Demo Site"
+  config.site_name = "Open Food Web"
 
   # config.shipping_instructions = true
   config.checkout_zone = 'Australia'
   config.address_requires_state = true
   config.default_country_id  = 12 # This should be Australia, see:spree/core/db/default/spree/countries.yml
+
+  config.searcher_class = OpenFoodWeb::Searcher
 end

lib/open_food_web/searcher.rb

@@ -0,0 +1,23 @@
+require 'spree/core/search/base'
+
+module OpenFoodWeb
+  class Searcher < Spree::Core::Search::Base
+
+    def get_base_scope
+      base_scope = super
+
+      base_scope = base_scope.in_supplier(supplier_id) if supplier_id
+      base_scope = base_scope.in_distributor(distributor_id) if distributor_id
+
+      base_scope
+    end
+
+
+    def prepare(params)
+      super(params)
+      @properties[:supplier_id] = params[:supplier_id]
+      @properties[:distributor_id] = params[:distributor_id]
+    end
+
+  end
+end

spec/lib/open_food_web/searcher_spec.rb

@@ -0,0 +1,32 @@
+require 'spec_helper'
+require 'open_food_web/searcher'
+
+module OpenFoodWeb
+  describe Searcher do
+    it "searches by supplier" do
+      # Given products under two suppliers
+      s1 = create(:supplier)
+      s2 = create(:supplier)
+      p1 = create(:product, :supplier => s1)
+      p2 = create(:product, :supplier => s2)
+
+      # When we search for one supplier, we should see only products from that supplier
+      searcher = Searcher.new(:supplier_id => s1.id.to_s)
+      products = searcher.retrieve_products
+      products.should == [p1]
+    end
+
+    it "searches by distributor" do
+      # Given products under two distributors
+      d1 = create(:distributor)
+      d2 = create(:distributor)
+      p1 = create(:product, :distributors => [d1])
+      p2 = create(:product, :distributors => [d2])
+
+      # When we search for one distributor, we should see only products from that distributor
+      searcher = Searcher.new(:distributor_id => d1.id.to_s)
+      products = searcher.retrieve_products
+      products.should == [p1]
+    end
+  end
+end