Add a seed_once with specs to test it.

lib/seed-fu.rb

@@ -73,6 +73,10 @@ class ActiveRecord::Base
   def self.seed(*constraints, &block)
     SeedFu::Seeder.plant(self, *constraints, &block)
   end
+
+  def self.seed_once(*constraints, &block)
+    SeedFu::Seeder.plant(self, *constraints, true, &block)
+  end
 
   def self.seed_many(*constraints)
     seeds = constraints.pop

spec/seed_fu_spec.rb

@@ -55,6 +55,50 @@
     SeededModel.find_by_login("harry").first_name.should == "Harry"
   end
 
+  it "should update, not create, if constraints are met" do
+    SeededModel.seed(:id) do |s|
+      s.id = 1
+      s.login = "bob"
+      s.first_name = "Bob"
+      s.last_name = "Bobson"
+      s.title = "Peon"
+    end
+
+    SeededModel.seed(:id) do |s|
+      s.id = 1
+      s.login = "bob"
+      s.first_name = "Robert"
+      s.last_name = "Bobson"
+      s.title = "Peon"
+    end
+
+    bob = SeededModel.find_by_id(1)
+    bob.first_name.should == "Robert"
+    bob.last_name.should == "Bobson"
+  end
+
+  it "should create but not update with seed_once" do
+    SeededModel.seed_once(:id) do |s|
+      s.id = 1
+      s.login = "bob"
+      s.first_name = "Bob"
+      s.last_name = "Bobson"
+      s.title = "Peon"
+    end
+
+    SeededModel.seed_once(:id) do |s|
+      s.id = 1
+      s.login = "bob"
+      s.first_name = "Robert"
+      s.last_name = "Bobson"
+      s.title = "Peon"
+    end
+
+    bob = SeededModel.find_by_id(1)
+    bob.first_name.should == "Bob"
+    bob.last_name.should == "Bobson"
+  end
+
   #it "should raise an error if constraints are not unique" do
   #  SeededModel.create(:login => "bob", :first_name => "Bob", :title => "Peon")
   #  SeededModel.create(:login => "bob", :first_name => "Robert", :title => "Manager")
@@ -66,7 +110,6 @@
   #end
 
   it "should default to an id constraint"
-  it "should update, not create, if constraints are met"
   it "should require that all constraints are defined"
   it "should raise an error if validation fails"
   it "should retain fields that aren't specifically altered in the seeding"