refactor finder

lib/gitlab/import_export/group_project_finder.rb

@@ -2,18 +2,22 @@ module Gitlab
   module ImportExport
     class GroupProjectFinder
       def self.find_or_new(*args)
-        new(*args).find_or_new
+        Project.transaction do
+          new(*args).find_or_new
+        end
       end
 
       def self.find_or_create(*args)
-        new(*args).find_or_create
+        Project.transaction do
+          new(*args).find_or_create
+        end
       end
 
       def initialize(klass, attributes)
         @klass = klass
         @attributes = attributes
-        @group_id = @attributes['group_id']
-        @project_id = @attributes['project_id']
+        @group = @attributes[:group]
+        @project = @attributes[:project]
       end
 
       def find_or_new
@@ -27,11 +31,11 @@ module Gitlab
       private
 
       def where_clause
-        @attributes.except('group_id', 'project_id').map do |key, value|
-          project_clause = table[key].eq(value).and(table[:project_id].eq(@project_id))
+        @attributes.except(:group, :project).map do |key, value|
+          project_clause = table[key].eq(value).and(table[:project_id].eq(@project.id))
 
-          if @group_id
-              project_clause.or(table[key].eq(value).and(table[:group_id].eq(@group_id)))
+          if @group
+            project_clause.or(table[key].eq(value).and(table[:group_id].eq(@group.id)))
           else
             project_clause
           end
@@ -43,7 +47,7 @@ module Gitlab
       end
 
       def project_attributes
-        @attributes.except('group_id').tap do |atts|
+        @attributes.except(:group).tap do |atts|
           atts['type'] = 'ProjectLabel' if label?
         end
       end