Merge branch 'tag_dup' into 'master'

Remove tag duplicates Prevention of getting this error: ``` ActiveRecord::RecordNotUnique: PG::Error: ERROR: could not create unique index "index_tags_on_name" DETAIL: Key (name)=(XSS') is duplicated. : CREATE UNIQUE INDEX "index_tags_on_name" ON "tags" ("name") ``` This migration fails if there are duplicates: https://github.com/mbleigh/acts-as-taggable-on/blob/v3.5.0/db/migrate/2_add_missing_unique_indices.rb#L3 See merge request !623

Merge branch 'tag_dup' into 'master'
cd2659fd · Valery Sizov · d881345e · b6071760 · cd2659fd
Commit cd2659fd authored May 08, 2015 by Valery Sizov
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20150425164647_remove_duplicate_tags.rb db/migrate/20150425164647_remove_duplicate_tags.rb +16 -0

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--- a/db/migrate/20150425164647_remove_duplicate_tags.rb
+++ b/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