MongoDB replica set connection string not support with method "parseConnectionUrl" & "buildConnectionUrl"

[gogotaro]

Issue Description

I like to test failed over with mongodb replica set and found It's not working then I try to console log a value of "connectionString" at method "buildConnectionUrl" and found this result below.

My example connection string

mongodb://test-primary.example.com:27017,test-secondary-1.example.com:27017,test-secondary-2.example.com:27017/testdb?replicaSet=testreplicaset

Result console log of connectionString

mongodb://test-primary.example.com:27017/testdb

As above secondary domain wasn't include in connectionString and I found some code in "parseConnectionUrl" split text like

const [host, port] = hostAndPort.split(":");

That's mean It's split host and port like standalone machine and another host was split out to no where.

In addition in "parseConnectionUrl" I found this;

        // remove mongodb query params
        if (afterBase && afterBase.indexOf("?") !== -1) {
            afterBase = afterBase.substr(0, afterBase.indexOf("?"));
        }

It's remove query params and that's why ReplicaSet Name was gone.

Last notice, method "buildConnectionUrl" was return format string like

return `${schemaUrlPart}://${credentialsUrlPart}${options.host || "127.0.0.1"}${portUrlPart}/${options.database || ""}`;

It's definitely not support replica set connection string for sure.

Expected Behavior

My example connection string

mongodb://test-primary.example.com:27017,test-secondary-1.example.com:27017,test-secondary-2.example.com:27017/testdb?replicaSet=testreplicaset

Expected result console log of connectionString at method buildConnectionUrl

mongodb://test-primary.example.com:27017,test-secondary-1.example.com:27017,test-secondary-2.example.com:27017/testdb

Actual Behavior

My example connection string

mongodb://test-primary.example.com:27017,test-secondary-1.example.com:27017,test-secondary-2.example.com:27017/testdb?replicaSet=testreplicaset

Actual result console log of connectionString at method buildConnectionUrl

mongodb://test-primary.example.com:27017/testdb

Steps to Reproduce

1. Create connection typescript source code

createConnection({
        name: 'mongoConnection',
        type: 'mongodb',
        url: `mongodb://test-primary.example.com:27017,test-secondary-1.example.com:27017,test-secondary-2.example.com:27017/testdb?replicaSet=testreplicaset`,
        entities: [ExampleEntity]
    })

PS. My use case can't separate replicaSet like this

createConnection({
        name: 'mongoConnection',
        type: 'mongodb',
        url: `mongodb://test-primary.example.com:27017,test-secondary-1.example.com:27017,test-secondary-2.example.com:27017/testdb`,
        replicaSet: 'testreplicaset',
        entities: [ExampleEntity]
    })

My ancient code fixed me to do like this haha but I think It should flexible to do both way.
2. console log of connectionString at method buildConnectionUrl

My Environment

Dependency	Version
Operating System	Ubuntu 18.04
Node.js version	v12.14.1
Typescript version	~v3.8.0
TypeORM version	v0.2.31

Relevant Database Driver(s)

• aurora-data-api
• aurora-data-api-pg
• better-sqlite3
• cockroachdb
• cordova
• expo
• mongodb
• mysql
• nativescript
• oracle
• postgres
• react-native
• sap
• sqlite
• sqlite-abstract
• sqljs
• sqlserver

Are you willing to resolve this issue by submitting a Pull Request?

• Yes, I have the time, and I know how to start.
• Yes, I have the time, but I don't know how to start. I would need guidance.
• No, I don't have the time, although I believe I could do it if I had the time...
• No, I don't have the time and I wouldn't even know how to start.

[gogotaro]

Merge this fix already thanks.