使用烧瓶在邮递员中返回的重复字段

Question

我正在开发一个简单的 python 应用程序，该应用程序从用户那里获取有关不同业务的评论，在这种情况下，我试图返回评论并将其视为个人评论，但是“评论”字段似乎是重复的，但我不知道在哪里。

这是应用程序的代码

from flask import Flask, request, jsonify, make_response
from pymongo import MongoClient
from bson import ObjectId
import json


class MyEncoder(json.JSONEncoder):

    def default(self, obj):
        if isinstance(obj, ObjectId):
            return str(obj)
        return super(MyEncoder, self).default(obj)

app = Flask(__name__)

client = MongoClient("mongodb://127.0.0.1:27017")
db = client.bizDB
businesses = db.biz
app.json_encoder = MyEncoder


with app.test_request_context():
    db.mycollection.insert_one({'a': 1})
    doc = db.mycollection.find_one({'a': 1})

    print(jsonify(doc).response)

@app.route("/api/v1.0/businesses", methods=["GET"])
def show_all_businesses():
    page_num, page_size = 1, 10
    if request.args.get("pn"):
        page_num = int(request.args.get("pn"))
    if request.args.get("ps"):
        page_size = int(request.args.get("ps"))
    page_start = page_size * (page_num - 1)

    data_to_return = []
    for business in businesses.find().skip(page_start).limit(page_size):
        business["_id"] = str(business["_id"])
        for review in business["reviews"]:
            review["_id"] = str(review["_id"])
        data_to_return.append(business)

    return make_response( jsonify( data_to_return ), 200 )


@app.route("/api/v1.0/businesses/<string:id>", methods=["GET"])
def show_one_business(id):
    business = businesses.find_one({"_id":ObjectId(id)})
    if business is not None:
        business["_id"] = str(business["_id"])
        for review in business["reviews"]:
            review["_id"] = str(review["_id"])
        return make_response ( jsonify ( business ), 200)
    else:
        return make_response (jsonify({ "error" : "Invalid Business ID" } ), 404)

@app.route("/api/v1.0/businesses", methods=["POST"])
def add_business():
    if "name" in request.form and "town" in request.form and "rating" in request.form:
        new_business = { "name" : request.form["name"],
                        "town" : request.form["town"],
                        "rating" : request.form["rating"],
                        "reviews" : {} 
                        }
        new_business_id = businesses.insert_one(new_business)
        new_business_link = "http://localhost:5000/api/v1.0/businesses/" + str(new_business_id.inserted_id)

        return make_response( jsonify( { "url" : new_business_link } ), 201 )
    else:
        return make_response ( jsonify( { "error" : "Missing form data" } ), 404 )


@app.route("/api/v1.0/businesses/<string:id>", methods=["PUT"])
def edit_business(id):
    if "name" in request.form and "town" in request.form and "rating" in request.form:
        result = businesses.update_one(
            {"_id" : ObjectId(id)},
            {
                "$set": { 
                    "name" : request.form["name"],
                    "town" : request.form["town"],
                    "rating" : request.form["rating"]
                }
            }
        )
        if result.matched_count == 1:
            edited_business_link = "http://localhost:5000/api/v1.0/businesses/" + id 
            return make_response( jsonify( { "url": edited_business_link } ), 200 )
        else:     
            return make_response ( jsonify( { "error" : "Invalid business ID" } ), 404 )
    else:
        return make_response ( jsonify( { "error" : "Missing form data" } ), 404 )

        
@app.route("/api/v1.0/businesses/<string:id>", methods=["DELETE"])
def delete_business(id):
    result = businesses.delete_one( { "_id" : ObjectId(id) })
    if result.deleted_count == 1:
        return make_response( jsonify( {} ), 200)
    else:
        return make_response ( jsonify( { "error" : "Invalid business ID" } ), 404 )



@app.route("/api/v1.0/businesses/<string:id>/reviews", methods=["POST"])
def add_new_review(id):
    new_review = { 
        "_id" : ObjectId(),
        "username" : request.form["username"],
        "comment" : request.form["comment"],
        "stars" : request.form["stars"]
    }
    businesses.update_one( { "_id" : ObjectId(id)} , {"$push" : { "reviews " : new_review}})
    new_review_link = "http://localhost:5000/api/v1.0/businesses/" + id + "/reviews/" + str(new_review["_id"])
    return make_response( jsonify( { "url" : new_review_link  } ), 201 )


@app.route("/api/v1.0/businesses/<string:id>/reviews", methods=["GET"])
def fetch_all_reviews(id):
    data_to_return = []
    business = businesses.find_one( {"_id" : ObjectId(id) }, { "reviews" : 1, "_id" : 0})
    for review in business["reviews"]:
        review["_id"] = str(review["_id"])
        data_to_return.append(review)
    return make_response( jsonify( data_to_return), 200 )


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

Postman 正在返回一个双重评论字段，这使得在尝试选择单个评论时返回的评论字段为空。 double review in postman

Answer 1

在 MongoDB 的同一个对象中不能有“重复”字段。仔细观察，您可以看到reviews 字段之一后面有一个空格。您需要在数据库和代码中整理这些内容。

Answer 2

这个函数有错别字：

@app.route("/api/v1.0/businesses/<string:id>/reviews", methods=["POST"])
def add_new_review(id):
    new_review = { 
        "_id" : ObjectId(),
        "username" : request.form["username"],
        "comment" : request.form["comment"],
        "stars" : request.form["stars"]
    }


    // NOTE THE EXTRA SPACE AFTER 'reviews'
    businesses.update_one( { "_id" : ObjectId(id)} , {"$push" : { "reviews " : new_review}})


    new_review_link = "http://localhost:5000/api/v1.0/businesses/" + id + "/reviews/" + str(new_review["_id"])
    return make_response( jsonify( { "url" : new_review_link  } ), 201 )

我认为这里发生的情况是您在开发过程中多次测试此函数并使用两个不同版本的代码更新了现有条目，因此响应 JSON 中的空 reviews 字段。擦除数据库并修复错字后，它应该会按预期工作。