sqlalchemy-challenge/app.py at main · wjriebel/sqlalchemy-challenge · GitHub

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import numpy as np
import pandas as pd
import datetime as dt

import sqlalchemy
from sqlalchemy.ext.automap import automap_base
from sqlalchemy.orm import Session
from sqlalchemy import create_engine, func, inspect

from flask import Flask, jsonify


#################################################
# Database Setup
#################################################
engine = create_engine("sqlite:///Resources/hawaii.sqlite")

# reflect an existing database into a new model
Base = automap_base()
# reflect the tables
Base.prepare(engine, reflect=True)

# Save reference to the table
Measurement= Base.classes.measurement
Station= Base.classes.station

#################################################
# Flask Setup
#################################################
app = Flask(__name__)


#################################################
# Flask Routes
#################################################

@app.route("/")
def welcome():
    """List all available api routes."""
    return (
        f"Available Routes:<br/>"
        f"/api/v1.0/precipitation<br/>"
        f"/api/v1.0/stations<br/>"
        f"/api/v1.0/tobs<br/>"
        f"/api/v1.0/<start>(start date as 'yyyy-mm-dd')<br/>"
        f"/api/v1.0/<start>/<end>(end start date as 'yyyy-mm-dd')<br/>"
    )


@app.route("/api/v1.0/precipitation")
def precipitation():
    # Create our session (link) from Python to the DB
    session = Session(engine)

    # previous year calculate
    # Query all passengers
    previous_year = dt.date(2017,8,23) - dt.timedelta(days=365)
    query_result= session.query(Measurement.date, Measurement.prcp).\
    filter(Measurement.date > previous_year).all()
    precipitation_results=dict(query_result)
    session.close()
    return jsonify(precipitation_results)

@app.route("/api/v1.0/stations")
def stations():
    # Create our session (link) from Python to the DB
    session = Session(engine)

    station_list=session.query(Station.station).all()
    stations=list(np.ravel(station_list))
    session.close()
    return jsonify(stations)

@app.route("/api/v1.0/tobs")
def temperature():
    # Create our session (link) from Python to the DB
    session = Session(engine)
    previous_year = dt.date(2017,8,23) - dt.timedelta(days=365)
    most_lastyear_tobs=session.query(Measurement.tobs)\
    .filter(Measurement.station=='USC00519281')\
    .filter(Measurement.date >= previous_year).all()
    temperature=list(np.ravel(most_lastyear_tobs))
    session.close()
    return jsonify(temperature)

@app.route("/api/v1.0/<start>")
def start(start):
    # Create our session (link) from Python to the DB
    session = Session(engine)
    results=session.query(func.min(Measurement.tobs),func.max(Measurement.tobs),func.avg(Measurement.tobs)).\
    filter(Measurement.date>=start).all()
    results_start=list(np.ravel(results))
    session.close()
    return jsonify(results_start)

@app.route("/api/v1.0/<start>/<end>")
def start_end(start, end):
    # Create our session (link) from Python to the DB
    session = Session(engine)
    results=session.query(func.min(Measurement.tobs),func.max(Measurement.tobs),func.avg(Measurement.tobs)).\
    filter(Measurement.date>=start).\
    filter(Measurement.date<=end).all()
    results_start=list(np.ravel(results))
    return jsonify(results_start)
    session.close()
# @app.route("/api/v1.0/passengers")
# def passengers():
#     # Create our session (link) from Python to the DB
#     session = Session(engine)

#     """Return a list of passenger data including the name, age, and sex of each passenger"""
#     # Query all passengers
#     results = session.query(Passenger.name, Passenger.age, Passenger.sex).all()

#     session.close()

#     # Create a dictionary from the row data and append to a list of all_passengers
#     all_passengers = []
#     for name, age, sex in results:
#         passenger_dict = {}
#         passenger_dict["name"] = name
#         passenger_dict["age"] = age
#         passenger_dict["sex"] = sex
#         all_passengers.append(passenger_dict)

#     return jsonify(all_passengers)


if __name__ == '__main__':
    app.run(debug=True)