Add a migration to remove requesters that are owners of their project

app/models/ability.rb

@@ -171,14 +171,9 @@ class Ability
           # Allow to read builds for internal projects
           rules << :read_build if project.public_builds?
 
-          group_member =
-            project.group &&
-            (
-              project.group.members.exists?(user_id: user.id) ||
-              project.group.requesters.exists?(user_id: user.id)
-            )
-
-          rules << :request_access unless owner || group_member || project.team.member?(user)
+          unless owner || project.team.member?(user) || project_group_member?(project, user)
+            rules << :request_access
+          end
         end
 
         if project.archived?
@@ -501,8 +496,7 @@ class Ability
       target_user = subject.user
       project = subject.project
 
-      # Allow owners that requested access to their own project to destroy themselves
-      if target_user != project.owner || subject.request?
+      unless target_user == project.owner
         can_manage = project_abilities(user, project).include?(:admin_project_member)
 
         if can_manage
@@ -582,5 +576,13 @@ class Ability
 
       rules
     end
+
+    def project_group_member?(project, user)
+      project.group &&
+      (
+        project.group.members.exists?(user_id: user.id) ||
+        project.group.requesters.exists?(user_id: user.id)
+      )
+    end
   end
 end

db/migrate/20160705163108_remove_requesters_that_are_owners.rb

+class RemoveRequestersThatAreOwners < ActiveRecord::Migration
+  include Gitlab::Database::MigrationHelpers
+
+  def up
+    # Delete requesters that are owner of their projects and actually requested
+    # access to it
+    execute <<-SQL
+      DELETE FROM members
+      WHERE members.source_type = 'Project'
+      AND members.type = 'ProjectMember'
+      AND members.requested_at IS NOT NULL
+      AND members.user_id = (
+        SELECT namespaces.owner_id
+        FROM namespaces
+        JOIN projects ON namespaces.id = projects.namespace_id
+        WHERE namespaces.type IS NULL
+        AND projects.id = members.source_id
+        AND namespaces.owner_id = members.user_id);
+    SQL
+
+    # Delete requesters that are owner of their project's group and actually requested
+    # access to it
+    execute <<-SQL
+      DELETE FROM members
+      WHERE members.source_type = 'Project'
+      AND members.type = 'ProjectMember'
+      AND members.requested_at IS NOT NULL
+      AND members.user_id = (
+        SELECT namespaces.owner_id
+        FROM namespaces
+        JOIN projects ON namespaces.id = projects.namespace_id
+        WHERE namespaces.type = 'Group'
+        AND projects.id = members.source_id
+        AND namespaces.owner_id = members.user_id);
+    SQL
+  end
+
+  def down
+  end
+end

db/schema.rb

@@ -11,7 +11,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20160703180340) do
+ActiveRecord::Schema.define(version: 20160705163108) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"