Added support for couchdb-lucene.

Added a search method to CouchRest:Database to search the documents in a
given database.  Added support for a :search parameter to Collection's
paginated_each method, which will allow you to paginate over a set of
search results.

This code has been brought to you by Dave Farkas (sakrafd) and
Arnaud Berthomier (oz).

lib/couchrest/core/database.rb

@@ -44,7 +44,14 @@ module CouchRest
         CouchRest.get url
       end
     end
-  
+
+    # Query a CouchDB-Lucene search view
+    def search(name, params={})
+      # -> http://localhost:5984/yourdb/_fti/YourDesign/by_name?include_docs=true&q=plop*'
+      url = CouchRest.paramify_url "#{root}/_fti/#{name}", params
+      CouchRest.get url
+    end
+
     # load a set of documents by passing an array of ids
     def get_bulk(ids)
       documents(:keys => ids, :include_docs => true)

lib/couchrest/mixins/collection.rb

@@ -42,7 +42,12 @@ module CouchRest
         #
         # Defaults are used if these options are not specified.
         def paginated_each(options, &block)
-          proxy = create_collection_proxy(options)
+          search = options.delete(:search)
+          unless search == true
+            proxy = create_collection_proxy(options)
+          else
+            proxy = create_search_collection_proxy(options)
+          end
           proxy.paginated_each(options, &block)
         end
 
@@ -61,6 +66,11 @@ module CouchRest
           CollectionProxy.new(database, design_doc, view_name, view_options, self)
         end
 
+        def create_search_collection_proxy(options)
+          design_doc, search_name, search_options = parse_search_options(options)
+          CollectionProxy.new(@database, design_doc, search_name, search_options, self, :search)
+        end
+
         def parse_view_options(options)
           design_doc = options.delete(:design_doc)
           raise ArgumentError, 'design_doc is required' if design_doc.nil?
@@ -75,6 +85,18 @@ module CouchRest
 
           [design_doc, view_name, view_options]
         end
+
+        def parse_search_options(options)
+          design_doc = options.delete(:design_doc)
+          raise ArgumentError, 'design_doc is required' if design_doc.nil?
+
+          search_name = options.delete(:view_name)
+          raise ArgumentError, 'search_name is required' if search_name.nil?
+
+          search_options = options.clone
+          [design_doc, search_name, search_options]
+        end
+
       end
 
       class CollectionProxy
@@ -91,11 +113,12 @@ module CouchRest
         #
         # The CollectionProxy provides support for paginating over a collection
         # via the paginate, and paginated_each methods.
-        def initialize(database, design_doc, view_name, view_options = {}, container_class = nil)
+        def initialize(database, design_doc, view_name, view_options = {}, container_class = nil, query_type = :view)
           raise ArgumentError, "database is a required parameter" if database.nil?
 
           @database = database
           @container_class = container_class
+          @query_type = query_type
 
           strip_pagination_options(view_options)
           @view_options = view_options
@@ -110,10 +133,22 @@ module CouchRest
         # See Collection.paginate
         def paginate(options = {})
           page, per_page = parse_options(options)
-          results = @database.view(@view_name, pagination_options(page, per_page)) 
+          results = @database.send(@query_type, @view_name, pagination_options(page, per_page))
           remember_where_we_left_off(results, page)
-          results = convert_to_container_array(results)
+          instances = convert_to_container_array(results)
-          results
+
+          begin
+            if Kernel.const_get('WillPaginate')
+              total_rows = results['total_rows'].to_i
+              paginated = WillPaginate::Collection.create(page, per_page, total_rows) do |pager|
+                pager.replace(instances)
+              end
+              return paginated
+            end
+          rescue NameError
+            # When not using will_paginate, not much we could do about this. :x
+          end
+          return instances
         end
 
         # See Collection.paginated_each
@@ -152,7 +187,8 @@ module CouchRest
 
         def load_target
           unless loaded?
-            results = @database.view(@view_name, @view_options)
+            @view_options.merge!({:include_docs => true}) if @query_type == :search
+            results = @database.send(@query_type, @view_name, @view_options)
             @target = convert_to_container_array(results)
           end
           @loaded = true
@@ -189,7 +225,7 @@ module CouchRest
 
         def pagination_options(page, per_page)
           view_options = @view_options.clone
-          if @last_key && @last_docid && @last_page == page - 1
+          if @query_type == :view && @last_key && @last_docid && @last_page == page - 1
             key = view_options.delete(:key)
             end_key = view_options[:endkey] || key
             options = { :startkey => @last_key, :endkey => end_key, :startkey_docid => @last_docid, :limit => per_page, :skip => 1 }

spec/couchrest/core/database_spec.rb

@@ -816,5 +816,25 @@ describe CouchRest::Database do
     
   end
 
+  describe "searching a database" do
+    before(:each) do
+      search_function = { 'defaults' => {'store' => 'no', 'index' => 'analyzed_no_norms'},
+          'index' => "function(doc) { ret = new Document(); ret.add(doc['name'], {'field':'name'}); ret.add(doc['age'], {'field':'age'}); return ret; }" }
+      @db.save_doc({'_id' => '_design/search', 'fulltext' => {'people' => search_function}})
+      @db.save_doc({'_id' => 'john', 'name' => 'John', 'age' => '31'})
+      @db.save_doc({'_id' => 'jack', 'name' => 'Jack', 'age' => '32'})
+      @db.save_doc({'_id' => 'dave', 'name' => 'Dave', 'age' => '33'})
+    end
+
+    it "should be able to search a database using couchdb-lucene" do
+      if couchdb_lucene_available?
+        result = @db.search('search/people', :q => 'name:J*')
+        doc_ids = result['rows'].collect{ |row| row['id'] }
+        doc_ids.size.should == 2
+        doc_ids.should include('john')
+        doc_ids.should include('jack')
+      end
+    end
+  end
 
 end

spec/couchrest/more/extended_doc_spec.rb

@@ -762,4 +762,36 @@ describe "ExtendedDocument" do
       cat.save.should be_true
     end
   end
+
+  describe "searching the contents of an extended document" do
+    before :each do
+      @db = reset_test_db!
+
+      names = ["Fuzzy", "Whiskers", "Mr Bigglesworth", "Sockington", "Smitty", "Sammy", "Samson", "Simon"]
+      names.each { |name| Cat.create(:name => name) }
+
+      search_function = { 'defaults' => {'store' => 'no', 'index' => 'analyzed_no_norms'},
+          'index' => "function(doc) { ret = new Document(); ret.add(doc['name'], {'field':'name'}); return ret; }" }
+      @db.save_doc({'_id' => '_design/search', 'fulltext' => {'cats' => search_function}})
+    end
+
+    it "should be able to paginate through a large set of search results" do
+      if couchdb_lucene_available?
+        names = []
+        Cat.paginated_each(:design_doc => "search", :view_name => "cats",
+             :q => 'name:S*', :search => true, :include_docs => true, :per_page => 3) do |cat|
+           cat.should_not be_nil
+           names << cat.name
+        end
+
+        names.size.should == 5
+        names.should include('Sockington')
+        names.should include('Smitty')
+        names.should include('Sammy')
+        names.should include('Samson')
+        names.should include('Simon')
+      end
+    end
+  end
+
 end

spec/spec_helper.rb

@@ -35,4 +35,15 @@ Spec::Runner.configure do |config|
       cr.database(db).delete! rescue nil
     end
   end
-end
+end
+
+def couchdb_lucene_available?
+  lucene_path = "http://localhost:5985/"
+  url = URI.parse(lucene_path)
+  req = Net::HTTP::Get.new(url.path)
+  res = Net::HTTP.new(url.host, url.port).start { |http| http.request(req) }
+  true
+ rescue Exception => e
+  false
+end
+