building REST API in FLASK - rest

Question

A very basic question. I have a FLASK app which has postgresql behind it. There are no ORM for this application. All requests are done via SQL psycopg2 interface.
Now I want to expose certain API's from this application. What would be the best way to proceed.
1> Just like: http://flask-peewee.readthedocs.org/en/latest/rest-api.html
2> or can I do one without the ORM. It seems that ORM for an RESTful API is very useful but in this case I have to have a separate database elements and copy data from the postgres model to the ORM.
any suggestion would be welcome.

Answer 1

I have a similar setup Flask + Postgres and PsycoPG2.
I followed the following tutorials to design and implement the API
I handle errors manually and respond with the appropriate HTTP code
http://blog.luisrei.com/articles/rest.html { Design API}
http://blog.luisrei.com/articles/flaskrest.html { Implement API}

Answer 2

Looks like Flask-Restless is a better choice. Validations, authentication support are much simpler with it.

Answer 3

For non-trivial applications better use flask-classy. Flask-Restless is somewhat limiting, and flask-restful doesn't really give much over flask-classy, besides being more complex.
I personally used flask-restless for some time before moving to flask-classy.

Answer 4

There is bunch of different frameworks on top of flask now.
http://python-eve.org/index.html
http://www.flaskapi.org/

Answer 5

REST API in FLASK and Postman app:
Code:
from flask_sqlalchemy import SQLAlchemy
from flask import Flask,render_template,request,jsonify,json
import psycopg2
import psycopg2.extras
app = Flask(__name__)
db = SQLAlchemy()
conn = psycopg2.connect("postgresql://postgres:postgres#localhost:5432/country")
cr = conn.cursor(cursor_factory=psycopg2.extras.DictCursor)
#app.route('/', methods=['GET'])
def test():
return jsonify({
'message': 'Welcome'
})
#app.errorhandler(404)
def page_not_found(e):
return "<h1>404</h1><p>The resource could not be found.</p>", 404
##### Countries ######
#app.route('/country/all', methods=['GET'])
def country():
cr.execute('select * from country')
country = cr.fetchall()
countries = []
for row in country:
countries.append(dict(row))
return jsonify(countries)
if __name__ == '__main__':
app.run(debug=True, port=8080)
Result:
**