###### from app/resources/post.py ##############
class PostView(Resource):
    def get(self, post_id):
        return Post.query.filter_by(id=post_id).first_or_404()

    def put(self, post_id):
        post = Post.query.filter_by(id=post_id).first_or_404()
        args = parser.parse_args()
        title = args.get('title')
        body = args.get('body')
        if title:
            post.title = title
        if body:
            post.body = body
        db.session.add(post)
        return post


class PostListView(Resource):
    def get(self):
        POSTS_PER_PAGE = current_app.config.get('POSTS_PER_PAGE') or 1
        args = parser.parse_args()
        offset = args.get('offset') or 1
        items = Post.query.all().\
                    order_by(Post.timestamp.desc()).\
                    paginate(offset, offset + POSTS_PER_PAGE, False).\
                    items()
        return items

    def post(self):
        args = parser.parse_args()
        title = args.get('title')
        body = args.get('body')
        if title and body:
            post = Post(
                title=title,
                body=body,
                timestamp=datetime.datetime.utcnow()
            )
            db.session.add(post)
            return post
        else:
            return 400
############### from app/__init__.py ##################
from flask import Flask
from flask_sqlalchemy import SQLAlchemy
from flask_restful import Api

from config import config


db = SQLAlchemy()
rest_api = Api()

def create_app(config_name='default'):
    app = Flask(__name__)
    app.config.from_object(config[config_name])
    db.init_app(app)
    rest_api.init_app(app)
    import resources
    rest_api.add_resource(resources.PostListView, '/', '/posts')
    rest_api.add_resource(resources.PostView, '/posts/<int:post_id>')
    return app