Cannot access data after full text search using sqlalchemy, postgres and flask - postgresql

Question

I would like to search my postgres data base using postgres build-in full text search capability. In my app I have a set of posts stored according to title, content and date.
I think I can search the database using tsvector, but cannot retrieve the data from the results; i.e. the title, the content and the date. Could anyone help me, please?
import json, sys
from flask import Flask, render_template
from flask_sqlalchemy import SQLAlchemy
from sqlalchemy.dialects import postgresql
from sqlalchemy.sql.expression import cast, func
from sqlalchemy import Index
def create_tsvector(*args):
exp = args[0]
for e in args[1:]:
exp += ' ' + e
return func.to_tsvector('english', exp)
app = Flask(__name__)
app.config['SECRET_KEY'] = 'some_key'
app.config["SQLALCHEMY_DATABASE_URI"] = 'postgresql:somedb'
db = SQLAlchemy(app)
class Post(db.Model):
id = db.Column(db.Integer, primary_key=True)
title = db.Column(db.Text, nullable=False)
content = db.Column(db.Text, nullable=False)
date = db.Column(db.Text,unique=False)
__ts_vector__ = create_tsvector(
cast(func.coalesce(content, ''), postgresql.TEXT)
)
__table_args__ = (Index('idx_post_fts', __ts_vector__, postgresql_using='gin'), )
def __repr__(self):
return f"Post('{self.title}', '{self.date}')"
if len(sys.argv) > 1:
filename1 = sys.argv[1]
infile=open(filename1,'r')
posts=json.load(infile)
infile.close()
List=list(posts)
art = 0
for j in range(0,len(List)):
if j % 10 == 0:
print(j)
title= posts[List[art]]['Title']
date = posts[List[art]]['Posted']
content=posts[List[art]]['Text']
post = Post(title=title, date=date, content=content)
db.session.add(post)
db.session.commit()
art+=1
from sqlalchemy.dialects.postgresql import TSVECTOR
from sqlalchemy import select, cast
posts = Post.__ts_vector__.match("bicycle", postgresql_regconfig='english')
print(posts)