已repository_id为范围，version唯一性控制

app/models/commit.rb

@@ -1,5 +1,8 @@
 class Commit < ActiveRecord::Base
   attr_accessible :comments, :committed_on, :committer, :project_id, :repository_id, :version
+  validates :repository_id, presence: true
+  validates :version, presence: true, uniqueness: {scope: :repository_id}
+  validates :committed_on, presence: true
   has_many :forge_acts, :class_name => 'ForgeActivity',:as =>:forge_act ,:dependent => :destroy
   after_create :act_as_forge_activity
 

lib/tasks/gitlab_forge_acts_update.rake

@@ -5,8 +5,8 @@ namespace :gitlab do
     ids = [2,847,931,942]
     projects = Project.find(ids)
     projects.each do |project|
-      c = Commit.where(:project_id => project.id)
-      if c.blank?
+      # c = Commit.where(:project_id => project.id)
+      # if c.blank?
         begin
           g_project = g.project(project.gpid)
           # 获取默认分支
@@ -26,7 +26,7 @@ namespace :gitlab do
         rescue Exception => e
           puts e
         end
-      end
+      # end
     end
   end
 end