on method should affect only the Model instance

[federicoparroni]

Describe the bug
In the Model class we have the on method defined both in the __passthrough__ list and a class method:

orm/src/masoniteorm/models/Model.py

Line 183 in 0ed9584

"on",

orm/src/masoniteorm/models/Model.py

Lines 1008 to 1011 in 0ed9584

	@classmethod
	def on(cls, connection):
	cls.__connection__ = connection
	return cls

Given this fact, it seems that the classmethod is always called, see the following example:

connection_name = "example-conn"
model = MyModel().on(connection_name)
print(model.builder.connection)    # example-conn
print(MyModel.__connection__)      # example-conn

Expected behavior
The class attribute __connection__ should not be changed.
I think the correct behaviour should be to passthrough the on method towards the QueryBuilder instance, so removing the class method or using another name for it (e.g.: global_on).