类型错误：无法使用猫鼬读取未定义的属性“查找”

Question

I saw a few questions like mine but couldn't find any solutions that worked so I thought I'd ask.

I'm trying to pull all my data from my database so I can select parts of it in my app. I had my database working fine but when I tried to pull the pictures it failed and keeps giving me this error and also does not seem to receive the data from the database:

 TypeError: Cannot read property 'find' of undefined

I have mongoose installed and everything connects so I can't figure out why it won't recognize the find property. My code is below if anyone has any ideas.

 // 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 + " />"); } });

Answer 1

If you are using mongoose you should define a schema to your collection, and than you can refer to that schema:

var weaponSchema = mongoose.Schema({
     .... your model definition here ....
});

var Weapon = mongoose.model('weapon', weaponSchema);

Than you can do:

Weapon.find({})........

Answer 2

For those of you who were interested I figured out the problem.

The issue was the lack of schema which I resolved but also the collection name in mongodb needed to be a plural and not a singular (so weapons not weapon).