Implement Relation#each_with_index

Gemfile

@@ -3,7 +3,7 @@ source "http://www.rubygems.org"
 gemspec
 
 gem 'rspec', '2.5'
-gem 'rr', '>= 1.0'
+gem 'rr', '1.0'
 gem 'pg'
 gem 'differ'
 gem 'machinist'

lib/prequel/record.rb

@@ -3,7 +3,7 @@ class Record < Tuple
     class << self
       delegate :all, :update, :dataset, :count, :[], :to_update_sql, :to_sql, :get_column, :first, :empty?, :find,
                :clear, :where, :where_any, :join, :join_through, :left_join, :project, :group_by, :order_by, :limit,
-               :offset, :tables, :synthetic_columns, :wire_representation, :to => :relation
+               :offset, :tables, :synthetic_columns, :wire_representation, :each, :each_with_index, :to => :relation
 
       def table
         relation

lib/prequel/relations/relation.rb

@@ -3,7 +3,7 @@ module Relations
     class Relation
       extend EqualityDerivation
 
-      delegate :to_sql, :dataset, :all, :first, :count, :size, :each, :empty?, :to => :query
+      delegate :to_sql, :dataset, :all, :first, :count, :size, :each, :each_with_index, :empty?, :to => :query
 
       def query(parent=nil)
         query_class.new(self, parent).build

lib/prequel/sql/query.rb

@@ -31,6 +31,12 @@ def each
         end
       end
 
+      def each_with_index
+        dataset.each_with_index do |field_values, index|
+          yield tuple_builder.build_tuple(field_values), index
+        end
+      end
+
       def first
         r = dataset
         r.empty? ? nil : tuple_builder.build_tuple(r.first)

prequel.gemspec

@@ -18,8 +18,8 @@ Gem::Specification.new do |s|
   s.add_dependency('activesupport', '>= 3.0.4')
   s.add_dependency('sequel', '>= 3.20.0')
 
-  s.add_development_dependency 'rspec', '>= 2.5'
-  s.add_development_dependency 'rr', '>= 1.0'
+  s.add_development_dependency 'rspec', '2.5'
+  s.add_development_dependency 'rr', '1.0'
   s.add_development_dependency 'pg'
   s.add_development_dependency 'differ'
   s.add_development_dependency 'machinist'

spec/prequel/relations/relation_spec.rb

@@ -28,6 +28,23 @@ class Post < Record
         end
       end
 
+      describe "#each_with_index" do
+        it "iterates over records in the relation with an index" do
+          DB[:blogs] << { :id => 1, :title => "Blog 1" }
+          DB[:blogs] << { :id => 2, :title => "Blog 2" }
+
+          records = []
+          indices = []
+          Blog.order_by(:id).each_with_index do |record, index|
+            records.push(record)
+            indices.push(index)
+          end
+
+          records.should == [Blog.find(1), Blog.find(2)]
+          indices.should == [0, 1]
+        end
+      end
+
       describe "#find" do
         before do
           DB[:blogs] << { :id => 1, :title => "Blog 1" }