在 Flask 应用程序中返回 flash.jsonify() 时出错

Question

Background:
I'm building a basic flask app, that will allow me to return a Collection from a Atlas Compass Cluster and then use the Collection data to create an HTML container to display the data and create some D3 charts.

Issue:
I've created two @app.route , to allow me to visualize how both json.dump and flask.jsonify return data, before I decide which to use

Unfortunately whilst my json.dump route returns the data (via an index.html page), my jsonify doesn't seem to work.. I get the following error returned in my Terminal

Error:
TypeError: jsonify() behavior undefined when passed both args and kwargs

Code:
Here is my code, which shows both @app.route

import flask
from flask import Flask, jsonify
import pymongo
from pymongo import MongoClient
from bson import ObjectId, json_util
import json

cluster = pymongo.MongoClient("mongodb+srv://group2:<PASSWORD>@cluster0.mpjcg.mongodb.net/<dbname>?retryWrites=true&w=majority")
db = cluster["simply_recipe"]
collection = db["recipes_collection"]

app = Flask(__name__)

@app.route("/recipes", methods=["GET"])
def get_recipes():
    all_recipes = list(collection.find({}))
    return json.dumps(all_recipes, default=json_util.default)

@app.route("/recipes_jsonify", methods=["GET"])
def get_recipes_jsonify():
    all_recipes = list(collection.find({}))
    return flask.jsonify(all_recipes, default=json_util.default)

I'm a complete beginner with Flask, so no doubt I have missed something obvious, can anyone help?

Answer 1

here have a look at this example, which explaines how jsonify can handle your data:

 from flask import jsonify

@app.route('/_get_current_user')
def get_current_user():
    return jsonify(username=g.user.username,
                   email=g.user.email,
                   id=g.user.id)

Output:

{
"username": "admin",
"email": "admin@localhost",
"id": 42
}

Source: https://www.kite.com/python/docs/flask.jsonify