feat: send emails to rsvps on event cancel

[gikf]

• I have read Chapter's contributing guidelines.
• My pull request has a descriptive title (not a vague title like Update README.md).
• My pull request targets the main branch of Chapter.

Still required:

• Email text.
• Tests?
• Anything else?

Related to #100

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Draft adding sending emails to rsvps when event is cancelled.

• Email is send to rsvps that are not cancelled. That means those confirmed or in waitlist. Note in generated data there might be generated rsvps with cancelled: true, but this doesn't seem to be displayed in the client right now.
• I've initially added permission check, similar to one in other resolver, based on user.user_event_roles, but as that's going to be handled by authorization I've removed it.
• Tested on local fork.

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[ojeytonwilliams]

Don't worry about the text for this PR, placeholders are fine for now.

Tests would be great, though!

chapter/cypress/integration/dashboard/events.js

Line 37 in e0cac15

it('emails interested users when an event is created', () => {

has some pretty similar logic, so might be worth a look.

One thing I was thinking about was changing RSVPs to be in a single 'state' (Going, OnWaitlist, Cancelled, etc), rather than having multiple boolean states. Something like this: https://dbdiagram.io/d/61d5605b3205b45b73d7b04a Reason being, the RSVP can only be in a single state at once (you can't be on_waitlist and cancelled, say), so I think a single state should be easier to reason about. Since you've just been looking at rsvps, I wondered if you had any thoughts on this.

Sorry for the slight tangent and thanks for working on this!

[gikf]

Thanks for the lead on tests, I'll take a look there.

I saw your issue about RSVPs status #783, I'd agree having status as a single field most likely will simplify some things and help avoid some awkwardness. Like determining if somebody is confirmed/going by checking both on_waitlist and cancelled.

[ojeytonwilliams]

No problem, thanks for taking a look.

I saw your issue about RSVPs status

Cool, I wasn't sure if you'd have seen that, since there's been a lot of discussion. Anyways, it's not something to worry about here, but I appreciate the feedback.

[ojeytonwilliams]

Nice one, @gikf. This LGTM 👍