Modify events config to follow the same form as docs

[Euen]

Replace {model, event_manager_module} instead of {doc_module, event_manager_module}

[cabol]

@Euen (/cc @elbrujohalcon) I think we support this already, we actually are handling the event in that way {model, event_manager_module}, check this out: https://github.com/inaka/sumo_db/blob/master/src/sumo_config.erl#L47

As you can see, the event config is defined as {DocName :: atom(), EventHandler :: module()}, where the DocName is the name of the model.

What we can do is make it more explicit, like this:

-type event_config() :: {SchemaName :: sumo:schema_name(), EventHandler :: module()}.

And this actually applies to the doc config as well:

-type doc_config() :: {SchemaName :: sumo:schema_name(), Store :: atom(), Props :: map()}.

What do you guys think?

[elbrujohalcon]

@cabol I'm not sure… I think @Euen and I needed to use the module in our config files for this to work. Are you sure it works, despite of that spec?

And yes… you can use sumo:schema_name() there, I'm cool with that.