from json import JSONEncoder

class PetEncoder(JSONEncoder):
        def default(self, o):
            return o.__dict__  

# ... ... ...

# A route to return all of the available entries in our catalog.
@app.route('/api/v1/resources/pets/all', methods=['GET'])
def api_all():
    allpets = [PetEncoder().encode(pet) for pet in pets]
    return jsonify(allpets)

import flask
from flask import request, jsonify
import uuid
from json import JSONEncoder

app = flask.Flask(__name__)
app.config["DEBUG"] = True

class PetEncoder(JSONEncoder):
        def default(self, o):
            return o.__dict__   

class Pet:
    def __init__(self,id, name, dateOfBirth):
      self.id = id.hex
      self.name = name
      self.dateOfBirth = dateOfBirth

# Create some test data for our catalog in the form of a list of dictionaries.
pets = [ Pet(uuid.uuid4(),'Hamster', '02.12.2019' )]
pets.append( Pet(uuid.uuid4(),'Fish', '07.03.1985' ))
pets.append( Pet(uuid.uuid4(),'Dog', '26.11.2000' ))
pets.append( Pet(uuid.uuid4(),'Cat', '17.05.2021' ))

@app.route('/', methods=['GET'])
def home():
    return "
Petshop Archive
This site is a prototype API for the petshop archive.
"

# A route to return all of the available entries in our catalog.
@app.route('/api/v1/resources/pets/all', methods=['GET'])
def api_all():
    allpets = [PetEncoder().encode(pet) for pet in pets]
    return jsonify(allpets)

if __name__ == '__main__':
    app.run(host='0.0.0.0')