Merge branch 'master' of gitlab.com:gitlab-org/gitlab-ce

db/migrate/20150425164646_gitlab_change_collation_for_tag_names.acts_as_taggable_on_engine.rb

+# This migration is a duplicate of 20150425164651_change_collation_for_tag_names.acts_as_taggable_on_engine.rb
+# It shold be applied before the index additions to ensure that `name` is case sensitive.
+
+class GitlabChangeCollationForTagNames < ActiveRecord::Migration
+  def up
+    if ActsAsTaggableOn::Utils.using_mysql?
+      execute("ALTER TABLE tags MODIFY name varchar(255) CHARACTER SET utf8 COLLATE utf8_bin;")
+    end
+  end
+end

db/migrate/20150425164647_remove_duplicate_tags.rb

+class RemoveDuplicateTags < ActiveRecord::Migration
+  def up
+    select_all("SELECT name, COUNT(id) as cnt FROM tags GROUP BY name HAVING COUNT(id) > 1").each do |tag|
+      duplicate_ids = select_all("SELECT id FROM tags WHERE name = '#{tag["name"]}'").map{|tag| tag["id"]}
+      origin_tag_id = duplicate_ids.first
+      duplicate_ids.delete origin_tag_id
+
+      execute("UPDATE taggings SET tag_id = #{origin_tag_id} WHERE tag_id IN(#{duplicate_ids.join(",")})")
+      execute("DELETE FROM tags WHERE id IN(#{duplicate_ids.join(",")})")
+    end
+  end
+
+  def down
+    
+  end
+end

db/migrate/20150425164648_add_missing_unique_indices.acts_as_taggable_on_engine.rb

@@ -3,8 +3,15 @@ class AddMissingUniqueIndices < ActiveRecord::Migration
   def self.up
     add_index :tags, :name, unique: true
-    remove_index :taggings, :tag_id
-    remove_index :taggings, [:taggable_id, :taggable_type, :context]
+    # pre-GitLab v6.7.0 may not have these indices since there were no
+    # migrations for them
+    if index_exists?(:taggings, :tag_id)
+      remove_index :taggings, :tag_id
+    end
+
+    if index_exists?(:taggings, [:taggable_id, :taggable_type, :context])
+      remove_index :taggings, [:taggable_id, :taggable_type, :context]
+    end
     add_index :taggings,
               [:tag_id, :taggable_id, :taggable_type, :context, :tagger_id, :tagger_type],
               unique: true, name: 'taggings_idx'