diff --git a/Gemfile b/Gemfile
index 7d71128..b827593 100644
--- a/Gemfile
+++ b/Gemfile
@@ -2,3 +2,6 @@ source 'https://rubygems.org'
 
 # Specify your gem's dependencies in seed-fu-mongoid.gemspec
 gemspec
+
+gem 'guard-cucumber', :git => 'git://github.com/johnbintz/guard-cucumber', :branch => 'paths_from_profile'
+
diff --git a/Guardfile b/Guardfile
new file mode 100644
index 0000000..1dc2142
--- /dev/null
+++ b/Guardfile
@@ -0,0 +1,10 @@
+# added by cuke-pack
+
+group :wip do
+  guard 'cucumber', :env => :cucumber, :paths_from_profile => true, :cli => '--color -p wip' do
+    watch(%r{^features/.+.feature$})
+    watch(%r{^(app|lib).*})          { 'features' }
+    watch(%r{^features/support/.+$})          { 'features' }
+    watch(%r{^features/step_definitions/(.+).rb$}) { 'features' }
+  end
+end
diff --git a/Rakefile b/Rakefile
index 2995527..ffc9f29 100644
--- a/Rakefile
+++ b/Rakefile
@@ -1 +1,6 @@
 require "bundler/gem_tasks"
+
+task :default do
+  system 'bundle exec cucumber'
+  exit $?.exitstatus if $?.exitstatus != 0
+end
diff --git a/config/cucumber.yml b/config/cucumber.yml
new file mode 100644
index 0000000..917d185
--- /dev/null
+++ b/config/cucumber.yml
@@ -0,0 +1,2 @@
+<%= require 'cuke-pack/profiles' ; CukePack::Profiles.write %>
+
diff --git a/config/mongoid.yml b/config/mongoid.yml
new file mode 100644
index 0000000..35c89b0
--- /dev/null
+++ b/config/mongoid.yml
@@ -0,0 +1,6 @@
+test:
+  sessions:
+    default:
+      database: seed_fu_mongoid_test
+      hosts:
+        - localhost:27017
diff --git a/features/seed_from_block.feature b/features/seed_from_block.feature
new file mode 100644
index 0000000..a3d5d18
--- /dev/null
+++ b/features/seed_from_block.feature
@@ -0,0 +1,4 @@
+Feature: Seed From Block
+  Scenario: Seed new records from block
+    When I seed records from a block
+    Then I should have the new records
diff --git a/features/seed_from_hash.feature b/features/seed_from_hash.feature
new file mode 100644
index 0000000..35be28e
--- /dev/null
+++ b/features/seed_from_hash.feature
@@ -0,0 +1,9 @@
+Feature: Seed From Hash
+  Scenario: Seed new records from hash
+    When I seed records from a hash
+    Then I should have the new records
+
+  Scenario: Update existing records from a hash
+    Given I have an existing record
+    When I seed records from a hash
+    Then I should have the new records
diff --git a/features/step_definitions/given/i_have_an_existing_record.rb b/features/step_definitions/given/i_have_an_existing_record.rb
new file mode 100644
index 0000000..a4a2767
--- /dev/null
+++ b/features/step_definitions/given/i_have_an_existing_record.rb
@@ -0,0 +1,6 @@
+Given(/^I have an existing record$/) do
+  record = Record.new
+  record[:_id] = 1
+  record[:data] = 'other'
+  record.upsert
+end
diff --git a/features/step_definitions/then/i_should_have_the_new_records.rb b/features/step_definitions/then/i_should_have_the_new_records.rb
new file mode 100644
index 0000000..0ec0d5f
--- /dev/null
+++ b/features/step_definitions/then/i_should_have_the_new_records.rb
@@ -0,0 +1,4 @@
+Then(/^I should have the new records$/) do
+  Record.count.should == 1
+  Record.find(1).data.should == 'data'
+end
diff --git a/features/step_definitions/when/i_seed_records_from_a_block.rb b/features/step_definitions/when/i_seed_records_from_a_block.rb
new file mode 100644
index 0000000..c09a199
--- /dev/null
+++ b/features/step_definitions/when/i_seed_records_from_a_block.rb
@@ -0,0 +1,6 @@
+When(/^I seed records from a block$/) do
+  Record.seed :id do |s|
+    s.id = 1
+    s.data = 'data'
+  end
+end
diff --git a/features/step_definitions/when/i_seed_records_from_a_hash.rb b/features/step_definitions/when/i_seed_records_from_a_hash.rb
new file mode 100644
index 0000000..9ad8830
--- /dev/null
+++ b/features/step_definitions/when/i_seed_records_from_a_hash.rb
@@ -0,0 +1,4 @@
+When(/^I seed records from a hash$/) do
+  Record.seed :id,
+    { :id => 1, :data => 'data' }
+end
diff --git a/features/support/cuke-pack.rb b/features/support/cuke-pack.rb
new file mode 100644
index 0000000..c1dd7f9
--- /dev/null
+++ b/features/support/cuke-pack.rb
@@ -0,0 +1,6 @@
+# write out missing steps automatically
+require 'cuke-pack/support/step_writer'
+
+# use advanced in_progress mode
+require 'cuke-pack/support/in_progress'
+
diff --git a/features/support/env.rb b/features/support/env.rb
new file mode 100644
index 0000000..5055393
--- /dev/null
+++ b/features/support/env.rb
@@ -0,0 +1,25 @@
+require 'database_cleaner'
+require 'mongoid'
+
+Mongoid.load!('config/mongoid.yml', :test)
+
+DatabaseCleaner[:mongoid].strategy = :truncation
+
+Before do
+  DatabaseCleaner[:mongoid].start
+end
+
+After do
+  DatabaseCleaner[:mongoid].clean
+end
+
+$: << File.expand_path('lib')
+
+require 'seed-fu-mongoid'
+
+class Record
+  include Mongoid::Document
+
+  field :data, type: String
+end
+
diff --git a/lib/seed-fu-mongoid.rb b/lib/seed-fu-mongoid.rb
index 8e1747c..aff9c19 100644
--- a/lib/seed-fu-mongoid.rb
+++ b/lib/seed-fu-mongoid.rb
@@ -31,8 +31,8 @@ module Mongoid::Document
       end
     end
 
-    def seed(*constraints, &block)
-      SeedFuMongoid::DocumentSeeder.new(self, constraints, block).seed!
+    def seed(*constraints_and_objects, &block)
+      SeedFuMongoid::DocumentSeeder.new(self, constraints_and_objects, block).seed!
     end
   end
 end
diff --git a/lib/seed-fu-mongoid/document_seeder.rb b/lib/seed-fu-mongoid/document_seeder.rb
index 4ef05c5..efd7026 100644
--- a/lib/seed-fu-mongoid/document_seeder.rb
+++ b/lib/seed-fu-mongoid/document_seeder.rb
@@ -4,55 +4,94 @@ module SeedFuMongoid
 
     attr_reader :constraints
 
-    def initialize(klass, constraints, block)
-      @klass, @constraints, @block = klass, constraints, block
+    def initialize(klass, constraints_and_objects, block)
+      @klass, @block = klass, block
+
+      @constraints = []
+      @objects = []
+
+      constraints_and_objects.each do |constraint_or_object|
+        case constraint_or_object
+        when Symbol
+          @constraints << constraint_or_object
+        when Hash
+          @objects << constraint_or_object
+        end
+      end
 
       if @constraints.empty?
         @constraints = [ :id ]
       end
     end
 
-    def proxy
-      return @proxy if @proxy
+    class Document
+      def initialize(klass, constraints, data_or_block)
+        @klass, @constraints = klass, constraints
 
-      @proxy = SeedProxy.new
-
-      @block.call(@proxy)
-
-      @proxy
-    end
-
-    def document
-      @doc ||= begin
-        @klass.find_by(constraint_search)
-      rescue => e
-        @klass.new
-      end
-    end
-
-    def constraint_search
-      return @constraint_search if @constraint_search
-
-      @constraint_search = {}
-      constraints.each do |constraint|
-        if proxy[constraint]
-          @constraint_search[constraint] = proxy[constraint]
+        case data_or_block
+        when Hash
+          @data = data_or_block
         else
-          raise ConstraintNotDefined.new(constraint)
+          @block = data_or_block
         end
       end
 
-      @constraint_search
+      def data
+        return @data if @data
+
+        @data = SeedProxy.new
+
+        @block.call(@data)
+
+        @data
+      end
+
+      def document
+        @doc ||= begin
+          @klass.find_by(constraint_search)
+        rescue => e
+          @klass.new
+        end
+      end
+
+      def constraint_search
+        return @constraint_search if @constraint_search
+
+        @constraint_search = {}
+        constraints.each do |constraint|
+          if data[constraint]
+            @constraint_search[constraint] = proxy[constraint]
+          else
+            raise ConstraintNotDefined.new(constraint)
+          end
+        end
+
+        @constraint_search
+      end
+
+      def seed!
+        data.each do |key, value|
+          document[key] = value
+        end
+
+        puts "#{@klass.name} #{document.attributes}"
+
+        document.upsert
+      end
+    end
+
+    def create_document(block_or_object)
+      Document.new(@klass, @constraints, block_or_object)
     end
 
     def seed!
-      proxy.each do |key, value|
-        document[key] = value
+      if @objects.empty?
+        create_document(@block).seed!
+      else
+        @objects.each do |object|
+          create_document(object).seed!
+        end
       end
-
-      puts "#{@klass.name} #{document.attributes}"
-
-      document.upsert
     end
 
     def new?
diff --git a/seed-fu-mongoid.gemspec b/seed-fu-mongoid.gemspec
index 3a420b2..66988ae 100644
--- a/seed-fu-mongoid.gemspec
+++ b/seed-fu-mongoid.gemspec
@@ -17,5 +17,12 @@ Gem::Specification.new do |gem|
   gem.test_files    = gem.files.grep(%r{^(test|spec|features)/})
   gem.require_paths = ["lib"]
 
-  gem.add_dependency 'mongoid'
+  gem.add_dependency 'mongoid', '>= 3.0.0'
+  gem.add_development_dependency 'cucumber'
+  gem.add_development_dependency 'rspec'
+  gem.add_development_dependency 'database_cleaner'
+  gem.add_development_dependency 'cuke-pack'
+  gem.add_development_dependency 'guard'
+  gem.add_development_dependency 'rb-fsevent'
+  gem.add_development_dependency 'guard-cucumber'
 end