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authorunarist <m.unarist@gmail.com>2017-06-06 23:07:06 +0900
committerEugen Rochko <eugen@zeonfederated.com>2017-06-06 16:07:06 +0200
commit004672aa6c482b212e36b9e794d107be456a11da (patch)
tree7bde1904fe421f63adb8210179ec8eb458fe16a3 /db/migrate
parentad4a28f4f689cc9a37a5c2d5dd8c012e964903b7 (diff)
Fix tag search order and not to use tsvector (#3611)
* Sort results by the name
* Switch search method to simple `LIKE` matching instead of tsvector/tsquery

Previously we used scores from ts_rank_cd() to sort results, but it didn't work
because the function returns same score for all results. It's not for calculate
similarity of single words. Sometimes this bug even push out exact matching tag
from results.

Additionally, PostgreSQL supports prefix searching with standard btree index.
Using it offers simpler code, but also less index size and some speed.
Diffstat (limited to 'db/migrate')
-rw-r--r--db/migrate/20170606113804_change_tag_search_index_to_btree.rb12
1 files changed, 12 insertions, 0 deletions
diff --git a/db/migrate/20170606113804_change_tag_search_index_to_btree.rb b/db/migrate/20170606113804_change_tag_search_index_to_btree.rb
new file mode 100644
index 000000000..5248e1720
--- /dev/null
+++ b/db/migrate/20170606113804_change_tag_search_index_to_btree.rb
@@ -0,0 +1,12 @@
+class ChangeTagSearchIndexToBtree < ActiveRecord::Migration[5.1]
+
+  def up
+    remove_index :tags, name: :hashtag_search_index
+    execute 'CREATE INDEX hashtag_search_index ON tags (name text_pattern_ops);'
+  end
+
+  def down
+    remove_index :tags, name: :hashtag_search_index
+    execute 'CREATE INDEX hashtag_search_index ON tags USING gin(to_tsvector(\'simple\', tags.name));'
+  end
+end