我看到了一些类似我的问题,但找不到任何有效的解决方案,所以我想我会问。
我正在尝试从我的数据库中提取所有数据,以便我可以在我的应用中选择部分数据。我的数据库运行正常,但是当我尝试拉出图片时它失败并且一直给我这个错误,而且似乎也没有从数据库接收数据:
TypeError: Cannot read property 'find' of undefined
我安装了mongoose并且所有内容都已连接,因此我无法弄清楚为什么它无法识别find属性。如果有人有任何想法,我的代码如下。
// Dependencies
var express = require("express");
var bodyParser = require("body-parser");
var mongoose = require("mongoose");
var exphbs = require("express-handlebars");
var request = require("request");
// var weapons = require("./weapons.js");
// Set mongoose to leverage built in JavaScript ES6 Promises
mongoose.Promise = Promise;
// Initialize Express
var app = express();
// Use morgan and body parser with our app
app.use(bodyParser.urlencoded({
extended: false
}));
// Make public a static dir
app.use(express.static(__dirname + "/public"));
app.engine("handlebars", exphbs({ defaultLayout: "main" }));
app.set("view engine", "handlebars");
// Database configuration with mongoose
mongoose.connect("mongodb://localhost/weaponsdb");
var db = mongoose.connection;
// Show any mongoose errors
db.on("error", function(error) {
console.log("Mongoose Error: ", error);
});
// Once logged in to the db through mongoose, log a success message
db.once("open", function() {
console.log("Mongoose connection successful.");
});
//routes to home page
app.get('/', function(req, res, next){
res.render("index",{ title: 'Express' });
});
app.get('/app', function(req, res, next){
res.render("app",{ layout: 'applayout' });
});
app.get("/all", function(req, res) {
// Query: In our database, go to the weapon collection, then "find" everything
db.weapon.find({}, function(error, found) {
// Log any errors if the server encounters one
if (error) {
console.log(error);
}
// Otherwise, send the result of this query to the browser
else {
res.json(found);
}
});
});
$.getJSON("/all", function(data) {
console.log(data)
// For each entry of that json...
for (var i = 0; i < data.length; i++) {
// Append each of the weapons' properties to the table
$("#results").append("<img src = " + data[i].Picture + " />");
}
});
答案 0 :(得分:2)
如果您使用 <iframe src="my-messages.php">
,则应为集合定义mongoose
,然后您可以参考该架构:
schema
比你能做的更多:
var weaponSchema = mongoose.Schema({
.... your model definition here ....
});
var Weapon = mongoose.model('weapon', weaponSchema);
答案 1 :(得分:2)
对于那些感兴趣的人我发现了问题。
问题是我解决了缺少架构,但mongodb中的集合名称需要是复数而不是单数(所以武器不是武器)。