Dont show fork button in personal projects. Point to fork if already forked project

app/models/ability.rb

@@ -69,7 +69,6 @@ class Ability
         :download_code,
         :write_snippet,
         :fork_project
-
       ]
     end
 

app/models/user.rb

@@ -326,4 +326,18 @@ class User < ActiveRecord::Base
   def tm_of(project)
     project.team_member_by_id(self.id)
   end
+
+  def already_forked? project
+    !!fork_of(project)
+  end
+
+  def fork_of project
+    links = ForkedProjectLink.where(forked_from_project_id: project, forked_to_project_id: personal_projects)
+
+    if links.any?
+      links.first.forked_to_project
+    else
+      nil
+    end
+  end
 end

app/views/projects/_clone_panel.html.haml

@@ -5,7 +5,11 @@
     .span3.pull-right
       .pull-right
         - unless @project.empty_repo?
-          - if can? current_user, :fork_project, @project
+          - if can?(current_user, :fork_project, @project) && @project.namespace != current_user.namespace
+            - if current_user.already_forked?(@project)
+              = link_to project_path(current_user.fork_of(@project)), class: 'btn grouped success' do
+                Forked
+            - else
               = link_to fork_project_path(@project), title: "Fork", class: "btn grouped", method: "POST" do
                 %i.icon-copy
                 Fork

app/views/projects/show.html.haml

@@ -40,3 +40,7 @@
       %p Repo Size: #{@project.repository.size} MB
       %p Created at: #{@project.created_at.stamp('Aug 22, 2013')}
       %p Owner: #{link_to @project.owner_name, @project.owner}
+      - if @project.forked_from_project
+        %p
+          Forked from:
+          = link_to @project.forked_from_project.name_with_namespace, project_path(@project.forked_from_project)