Tortoise ORM always raises ParamsError() in tests if in_trasaction() is used

[MrAngry]

This is fairly simple to explain but was extremely annoying to debug:

extract from initializer()

    Tortoise.apps = {}
    Tortoise._connections = {}
    Tortoise._inited = False

extract from get_connection() called by in_transaction() as first statement

    if connection_name:
        connection = current_transaction_map[connection_name].get()
    elif len(Tortoise._connections) == 1:   <----- CONNECTIONS ARE EMPTY
        connection_name = list(Tortoise._connections.keys())[0]
        connection = current_transaction_map[connection_name].get()
    else:  <----- THIS WILL ALWAYS BE EXECUTED 
        raise ParamsError(
            "You are running with multiple databases, so you should specify"
            f" connection_name: {list(Tortoise._connections.keys())}"
        )
    return connection

[long2ice]

Why empty there?

[MrAngry]

The initializer() clears the connections map. When running tests I always got:

"You are running with multiple databases, so you should specify connection_name: [] "

So that's is how I started to look at what clears the connections map.

[kamilturek]

It is fixed by #1001. The issue can be closed.