fix: how to connect to local MongoDB instance

[filipe-freire]

The current step on how to connect to a local MongoDB instance can cause the error detailed in the following issue:
#170

The proposed changes aim to fix that by replacing the "mongodb://localhost:27017" with "mongodb://127.0.0.1:27017".

This fixed was submitted by @michaeldesu in the issue linked above.

[lucsoft]

Is this a windows only thing?

On Linux and macOS it's completely the same?

I don't see how this changes anything?
Or is the issue something else?

[filipe-freire]

Can only speak for Linux as I found this issue today running PopOS 22.04 LTS. Following the current instructions in the docs returns the following error:

Error: MongoError: "Connection failed: Connection refused (os error 111)"
      throw new MongoDriverError(`Connection failed: ${e.message || e}`);
            ^
    at MongoClient.connect (https://deno.land/x/mongo@v0.29.4/src/client.ts:44:13)

That ceases to happen once we replace await client.connect("mongodb://localhost:27017"); for await client.connect("mongodb://127.0.0.1:27017");

[lucsoft]

I don't like the solution to this problem

localhost is 127.0.0.1 and ::1

We should dig a bit more into it.
Not just changing the readme.
People will still use localhost

[lucsoft]

Is this a deno_mongo error? Or is this a Deno error even?

[filipe-freire]

I would still change the docs to use 127.0.0.1 so long as the root cause of this issue is not identified & fixed. At least then users wouldn't face issues while setting up deno_mongo for the first time.

But ideally, like you mentioned, both ways should work interchangeably. 😃

[erfanium]

@filipe-freire can you help me how i can reproduce this issue in Ubuntu?

[filipe-freire]

@erfanium I can sure try :) The issue occurs when running a file with the following code:

import { MongoClient } from "https://deno.land/x/mongo@v0.29.4/mod.ts";

const client = new MongoClient();

// Connecting to a Local Database
await client.connect("mongodb://localhost:27017");

You can run the file with the following flags: deno run --allow-net app.ts

The output should be the following error:

error: Uncaught (in promise) Error: MongoError: "Connection failed: Connection refused (os error 111)"
      throw new MongoDriverError(`Connection failed: ${e.message || e}`);
            ^
    at MongoClient.connect (https://deno.land/x/mongo@v0.29.4/src/client.ts:44:13)

[erfanium]

I would still change the docs to use 127.0.0.1 so long as the root cause of this issue is not identified & fixed

I'm okay with that