[5.8] Replicating model event

[jerguslejko]

This PR introduces "replicating" model event which is fired when $model->replicate() is called.

This is useful when "replication" is a part of the domain logic. My usecase: I need to reset an attribute every time a model is replicated, because that attribute is specific to the model.

[taylorotwell]

How many different models do you have this use case for? Is it mainly a single model?

[AbdelElrafa]

@jerguslejko Why not have a replicating and a replicated event?

[devcircus]

Maybe do the replication in a method on your model and fire a custom event. IMO it doesn't seem like a common enough use-case for core.

[taylorotwell]

Maybe do the replication in a method on your model and fire a custom event. IMO it doesn't seem like a common enough use-case for core.

This is kinda what I was getting at with my comment. If you're just doing this on a particular model it may be easier to just make it a method in your application.

[jerguslejko]

@AbdelElrafa replicating a model does not create a new database record. therefore replicated would be the same as replicating

@taylorotwell I need to be able to dynamically register replication logic in a service provider. using the replicating model event makes it super easy

[AbdelElrafa]

@jerguslejko I was thinking, like during the replicating event you can make some api call to do something, and during the replicated event you can just save the model automatically. Give the user the choice like we do with the other events.

Take a look at this, https://laravel.com/docs/5.0/eloquent#model-events.
Like during the replicating event you can stop it by returning false.