Add migration to fix fulltext search

migrations/versions/3710e5fbbe87_.py

@@ -0,0 +1,54 @@
+"""empty message
+
+Revision ID: 3710e5fbbe87
+Revises: f6ef5f35abca
+Create Date: 2022-01-27 18:50:11.705061
+
+"""
+from alembic import op
+import sqlalchemy as sa
+from sqlalchemy.dialects import postgresql
+
+# revision identifiers, used by Alembic.
+revision = '3710e5fbbe87'
+down_revision = 'f6ef5f35abca'
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    command = """
+            CREATE OR REPLACE FUNCTION parse_websearch(config regconfig, search_query text)
+            RETURNS tsquery AS $$
+            SELECT
+                string_agg(
+                    (
+                        CASE
+                            WHEN position('''' IN words.word) > 0 THEN CONCAT(words.word, ':*')
+                            ELSE words.word
+                        END
+                    ),
+                    ' '
+                )::tsquery
+            FROM (
+                SELECT trim(
+                    regexp_split_to_table(
+                        websearch_to_tsquery(config, lower(search_query))::text,
+                        ' '
+                    )
+                ) AS word
+            ) AS words
+            $$ LANGUAGE SQL IMMUTABLE;
+            
+            
+            CREATE OR REPLACE FUNCTION parse_websearch(search_query text)
+            RETURNS tsquery AS $$
+            SELECT parse_websearch('pg_catalog.simple', search_query);
+            $$ LANGUAGE SQL IMMUTABLE;"""
+
+    op.execute(command)
+
+
+def downgrade():
+    op.execute('DROP FUNCTION public.parse_websearch(regconfig, text);')
+    op.execute('DROP FUNCTION public.parse_websearch(text);')