节点填充 b url 不起作用

Question

I am learning ExpressJs tutorial from https://developer.mozilla.org/en-US/docs/Learn/Server-side/Express_Nodejs/mongoose

Now I have created module for mongodb database and then create a file populatedb.js in the root directory. Now I am trying to connect to database using command (as describe at last on above link)

node populatedb mongodb://dbuser:dbpassword@ds133814.mlab.com:33814/local_library_tutorial

but terminal response nothing and there doesn't happen in database

Answer 1

My Brother.

I ran into the same problem, and when my search led me to your question i was even more sad when I saw no answer, however after searching around, I found an answer!

1. Make sure you replace the "dbuser:dbpassword" placeholders with actual data eg "Elias:js44889" on your mongo url.

2. Also just make sure it's also the same as the one in app.js.

I think all should be fine as it was for me.

Answer 2

you must include the script in populatedb.js to get work done.

populatedb.js script link : https://raw.githubusercontent.com/hamishwillee/express-locallibrary-tutorial/master/populatedb.js

After inserting the script in populatedb.js file from above link, then run the following commands to populate data in mongoDB.

npm install async (if not installed async module)

node populatedb <your mongodb url>

Answer 3

sometimes you may get an error if you use the same collection name in all of your models, this happened to me until i realised what i was doing was wrong.

for example don't do this

const authorModel = mongoose.model('author', AuthorSchema)
const bookModel = mongoose.model('author', BookSchema)

if you do it un-expeectedly it will throw this error
OverwriteModelError: Cannot overwrite author model once compiled.

instead in the commandline for "windows users" write

node populatedb mongodb+srv://username:password@yourcluster.mongodb.net/yourdatabase

and in your models make sure that the collections are not the same

const authorModel = mongoose.model('author', AuthorSchema)
const bookModel = mongoose.model('book', BookSchema)

Answer 4

I also ran into the same issue as I am doing the same tutorial. What I did to resolve this issue is go to the populatedb.js link they provide in the first step of the "Testing - create some items" or you can download it. Once I clicked on the link, they provide test data that you can paste into the populatedb.js file you've created in the root of your project then:

2. npm install async --save
3. node populatedb <your mongodb url>
4. Script should run and you should see the results or items as it creates them.

Answer 5

Followed the MDN tutorial, Here is what I fixed:

username:Jeff ; password : 12345

app.js, change to:

var mongoDB = 'mongodb://Jeff:123@ds149732.mlab.com:49732/local_library';

Command Line prompt, change to:

node populatedb mongodb://Jeff:12345@ds149732.mlab.com:49732/local_library

Answer 6

Posting here because this answer is the result I found googling the problem.

Had the same problem, the error ended up being the password I have set for the admin on the database - special characters were encoded (there was a warning displayed which I apparently ignored) which caused me to not be able to connect.

Answer 7

I had this issue for a couple of days with the error

zsh: no matches found: <my mongodb url>

First, I double checked I had followed the instructions in Testing — create some items in the tutorial. Then I changed my original mongodb URL in the terminal, removing the end.

My original mongoURL =

mongodb+srv://username:password@cluster0.9f24o.mongodb.net/myFirstDatabase?retryWrites=true&w=majority

My new mongoURL =

mongodb+srv://username:password@cluster0.9f24o.mongodb.net/myFirstDatabase

I ran this script while in my express-locallibrary tutorial folder.

node populatedb mongodb+srv://username:password@cluster0.9f24o.mongodb.net/myFirstDatabase

I'm not sure at this point if this means I need to change the link in app.js as well.

Hopefully this saves someone some time!