I want to use the [Transactions with Sessions|https://docs.mongodb.com/mongoid/7.0/tutorials/mongoid-sessions/] on the Mongoid. 

 

To make this possible, I already did setup a replica set on my system, but I am having a version problem with the `MongoDB server` which I am trying, but cannot upgrade.

 

How to Reproduce...

 

1. Enter on rails console

```rb

rails c

```

 

2.  Try to execute this code

```rb

Project.with_session do |session|

  session.start_transaction

  Project.create!(name: 'Example')

  session.commit_transaction

end

```

 

3. The result here is the following error message

```rb

Mongoid::Errors::InvalidSessionUse:

message:

  Sessions are not supported by the connected server(s).

summary:

  A session was attempted to be used with a MongoDB server version that doesn't support sessions. Sessions are supported in MongoDB server versions 3.6 and higher.

resolution:

  Verify that all servers in your deployment are at least version 3.6 or don't attempt to use sessions with older server versions.

from /Users/victor/.rvm/gems/ruby-2.6.5@pocket/gems/mongoid-7.0.5/lib/mongoid/clients/sessions.rb:98:in `rescue in with_session'

Caused by Mongo::Error::InvalidSession: Sessions are not supported by the connected servers.

from /Users/victor/.rvm/gems/ruby-2.6.5@pocket/gems/mongo-2.12.1/lib/mongo/client.rb:865:in `start_session'

```

 

My replica sets

```rb

$ mlaunch list

 

PROCESS    PORT     STATUS     PID

 

mongod     27017    running    -

mongod     27018    running    33353

mongod     27019    running    33356

```

 

 

My `mongoid.yml` file config

```yaml

development:

  clients:

    default:

      database: pocket_api_development

      hosts:

        - "<%= ENV["MONGO_HOST"] %>:27017"

      options:

        user: 'root'

        password: 'ri8Oogu6'

        auth_source: admin

        replica_set: replset

  options:

test:

  clients:

    default:

      database: pocket_api_test

      hosts:

        - "<%= ENV["MONGO_HOST"] %>:27017"

      options:

        read:

          mode: :primary

        max_pool_size: 1

        user: 'root'

        password: 'ri8Oogu6'

        auth_source: admin

```