[cookbook] add description of doctrine event subscriber

[dbu]

this confused me quite a bit, so i thought i better document it: the doctrine event subscriber is simpler than the symfony event subscriber. if you return from doctrine an array mapping event names to method names, doctrine will register for "events" with the names of those methods.

[wouterj]

You should add .. code-block::php before this line

[dbu]

done

[dbu]

sorry, seem to be tired. fixed those (and the source of my copy-paste too)

[dbu]

@wouterj i fixed the styling problems. ok to merge?

[wouterj]

@dbu yes, I think so. But @weaverryan is the only person who can merge, so you need to wait until he has some time to merge some PRs.

[stof]

I think you should contribute this to the Doctrine Common documentation about the EventManager instead and link it from the Symfony doc. Let's improve the doc of the Doctrine project as well :)

[dbu]

i can try an update of the event listener doc in doctrine as well. but i still think that at least this tip belongs here rather than into the doctrine doc.
the doctrine doc already has an example of event listeners, but not event subscribers i think. i thought it does make sense to have the minimal examples here in the symfony doc too, to see how it works and then follow the link for details. how much of this cookbook entry would you want to remove?

[stof]

well, the doctrine doc should have an example of subscribers IMO

[dbu]

i did a pull request on doctrine doc now doctrine/orm-documentation#155 and added more links from here to that doc. i think it is useful to have the concrete examples right here in this cookbook entry, even if its duplication.

[dbu]

this link lead to a 404. i changed it (but git diff puts it at the very bottom of what i added here...)

[dbu]

created a doctrine PR on the right repository now: doctrine/orm#621

any other feedback on this?

[weaverryan]

Hey David!

Very nice addition! I've merged this in with only minor tweaks at sha: 6f191da.

Thanks!