improve search

priv/repo/migrations/20221128003712_fix_search.exs

@@ -0,0 +1,56 @@
+defmodule Memex.Repo.Migrations.FixSearch do
+  use Ecto.Migration
+
+  def up do
+    reset_search_columns()
+  end
+
+  def down do
+    # no way to rollback this migration since the previous generated search columns were invalid
+    reset_search_columns()
+  end
+
+  defp reset_search_columns() do
+    alter table(:notes), do: remove(:search)
+    alter table(:contexts), do: remove(:search)
+    alter table(:pipelines), do: remove(:search)
+
+    flush()
+
+    execute """
+    ALTER TABLE notes
+    ADD COLUMN search tsvector
+      GENERATED ALWAYS AS (
+        setweight(to_tsvector('english', coalesce(slug, '')), 'A') ||
+        setweight(to_tsvector('english', coalesce(immutable_array_to_string(tags, ' '), '')), 'B') ||
+        setweight(to_tsvector('english', coalesce(content, '')), 'C')
+      ) STORED
+    """
+
+    execute("CREATE INDEX notes_trgm_idx ON notes USING GIN (search)")
+
+    execute """
+    ALTER TABLE contexts
+      ADD COLUMN search tsvector
+      GENERATED ALWAYS AS (
+        setweight(to_tsvector('english', coalesce(slug, '')), 'A') ||
+        setweight(to_tsvector('english', coalesce(immutable_array_to_string(tags, ' '), '')), 'B') ||
+        setweight(to_tsvector('english', coalesce(content, '')), 'C')
+      ) STORED
+    """
+
+    execute("CREATE INDEX contexts_trgm_idx ON contexts USING GIN (search)")
+
+    execute """
+    ALTER TABLE pipelines
+      ADD COLUMN search tsvector
+      GENERATED ALWAYS AS (
+        setweight(to_tsvector('english', coalesce(slug, '')), 'A') ||
+        setweight(to_tsvector('english', coalesce(immutable_array_to_string(tags, ' '), '')), 'B') ||
+        setweight(to_tsvector('english', coalesce(description, '')), 'C')
+      ) STORED
+    """
+
+    execute("CREATE INDEX pipelines_trgm_idx ON pipelines USING GIN (search)")
+  end
+end