Mongodb 似乎加载了两次数据。不知道为什么，也不确定我是否正确加载了 mongodb

Question

我正在尝试让我的烧瓶应用程序将 csv 文件加载到 mongodb 中，然后将数据显示回来。出于某种原因，在我的应用程序的某个地方，数据被重复了。真的不知道如何调试它，也不确定我是否首先在正确的位置设置数据加载。任何意见，将不胜感激。相关代码如下：

from flask import Flask, render_template, request, redirect
import pymongo
from pymongo import MongoClient

import io
import csv
import json
import ast

app = Flask(__name__)
client = MongoClient("mongodb://db:27017")
db = client.projectDB
""" 
HELPER FUNCTIONS
"""

def loadDB():
    print("Initializing mongodb client")
    
    db_collection = db['recipe_data']
    #Uniqueness constraint for name, not necessary?
    # db_collection.createIndex( { "name": 1 }, { unique: true } )
    if db_collection.count() == 0:
        recipes = db_collection.recipes
        loaded_recipes_list = loadRecipes()
        for recipe in loaded_recipes_list:
            recipes.insert_one(recipe)
    print("Database loaded successfully!")

def loadRecipes():
    recipe_data = []

    #Load recipes
    csv_file = "./recipes_short.csv"
    rows = io.open(csv_file, "r", encoding="utf-8")
    reader = csv.reader(rows)
    for data in reader:
        recipe = {}
        recipe['name'] = data[0]
        recipe['id'] = data[1]
        recipe['minutes'] = data[2]
        recipe['contributor_id'] = data[3]
        recipe['submitted'] = data[4]
        recipe['tags'] = data[5].lstrip('[').rstrip(']').replace("'", "").split(',')
        recipe['n_steps'] = data[6].lstrip('[').rstrip(']').replace("'", "").split(',')
        recipe['steps'] = data[7]
        recipe['description'] = data[8].lstrip('[').rstrip(']').replace("'", "").split(',')
        recipe['ingredients'] = data[9]
        recipe['n_ingredients'] = data[10].lstrip('[').rstrip(']').replace("'", "").split(',')
        recipe_data.append(recipe)
    print(recipe_data)
    return recipe_data

@app.route("/")
def home():
    return render_template('index.html')


if __name__ == '__main__':
    loadDB()
    app.run(debug=True,host='0.0.0.0')

Answer 1

这是因为您使用 debug=True 运行烧瓶。这将在启动时重新加载文件，因此将运行您的数据加载器两次。

如果您取消标记（无论如何您都应该在生产中这样做），它将不会重新加载。