add Alias.ts_vector column to use full text search

app/models.py

@@ -8,7 +8,7 @@ import arrow
 from arrow import Arrow
 from flask import url_for
 from flask_login import UserMixin
-from sqlalchemy import text, desc, CheckConstraint
+from sqlalchemy import text, desc, CheckConstraint, Index
 from sqlalchemy.orm import deferred
 from sqlalchemy_utils import ArrowType
 
@@ -39,6 +39,13 @@ from app.utils import (
     random_word,
 )
 
+import sqlalchemy as sa
+from sqlalchemy.dialects.postgresql import TSVECTOR
+
+
+class TSVector(sa.types.TypeDecorator):
+    impl = TSVECTOR
+
 
 class ModelMixin(object):
     id = db.Column(db.Integer, primary_key=True, autoincrement=True)
@@ -1121,6 +1128,16 @@ class Alias(db.Model, ModelMixin):
     hibp_last_check = db.Column(ArrowType, default=None)
     hibp_breaches = db.relationship("Hibp", secondary="alias_hibp")
 
+    # to use Postgres full text search. Only applied on "note" column for now
+    # this is a generated Postgres column
+    ts_vector = db.Column(
+        TSVector(), db.Computed("to_tsvector('english', note)", persisted=True)
+    )
+
+    __table_args__ = (
+        Index("ix_video___ts_vector__", ts_vector, postgresql_using="gin"),
+    )
+
     user = db.relationship(User, foreign_keys=[user_id])
     mailbox = db.relationship("Mailbox", lazy="joined")
 

migrations/versions/2021_080409_9014cca7097c_.py

@@ -0,0 +1,31 @@
+"""empty message
+
+Revision ID: 9014cca7097c
+Revises: ffa75d04e6ef
+Create Date: 2021-08-04 09:28:26.620053
+
+"""
+import sqlalchemy_utils
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = '9014cca7097c'
+down_revision = 'ffa75d04e6ef'
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.add_column('alias', sa.Column('ts_vector', app.models.TSVector(), sa.Computed("to_tsvector('english', note)", persisted=True), nullable=True))
+    op.create_index('ix_video___ts_vector__', 'alias', ['ts_vector'], unique=False, postgresql_using='gin')
+    # ### end Alembic commands ###
+
+
+def downgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_index('ix_video___ts_vector__', table_name='alias')
+    op.drop_column('alias', 'ts_vector')
+    # ### end Alembic commands ###