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If you need to disconnect a given connection, you can go through the RemoteConnections. You can find the connections you're looking for by searching for the identifier declared on the connection. For example:

module ApplicationCable
  class Connection < ActionCable::Connection::Base
    identified_by :current_user
    ....
  end
end

ActionCable.server.remote_connections.where(current_user: User.find(1)).disconnect

This will disconnect all the connections established for User.find(1), across all servers running on all machines, because it uses the internal channel that all of these servers are subscribed to.

Namespace
Methods
N
W
Attributes
[R] server
Class Public methods
new(server)
# File actioncable/lib/action_cable/remote_connections.rb, line 24
def initialize(server)
  @server = server
end
Instance Public methods
where(identifier)
# File actioncable/lib/action_cable/remote_connections.rb, line 28
def where(identifier)
  RemoteConnection.new(server, identifier)
end