How to organise reusable functions
How do you guys organize functions that all need the same context (usually from tRPC)?
For example let's say that you have 10 functions you use multiple times across multiple routers and they all share the same context. Do you use a class?
16 Replies
Can you share an example?
E.g. a function that given an input user ID checks a bunch of properties on that user (e.g. for an educational app that the current user has a valid teacher's contract)
Or a function that checks that some invariants are hold during certain operations (e.g. for a calendar app that multiple events don't overlap on the same calendar when: moving, swapping, rescheduling, etc.)
Probably makes sense to type the function just with the deps it needs, rather than a full Context
These just sound like utilities so ideally should be too coupled to the APi right?
It's kinda cumbersome to do that though. It's also difficult to enforce that the parameter is the first/last of the series of arguments so you end up with an inconsistent library
TBH I don't see the context as part of the API
The context is more of a business logic piece in my mind
This is definitely a case of "move stuff around until it feels right"
tRPC doesn't really have any strong opinions about how to do this
Yeah I know, I was just wondering how you guys get by
Personally, I put service classes into the Context and use it like DI, then have some utility functions without any strong pattern for their interfaces
Wdym by "putting service classes into the context" exactly? Sounds like what I'm looking for
using createContext I instantiate any services I need and then procedures can consume them
Like ORM Repositories, API Clients, etc
So then you call something like
ctx.someService.create(...)?You can also use middlewares to extend the Context with extra services if you want to scope them
If you like
No right answers here, just what fits your needs/opinions
I know, but I'm trying to understand what your way is and if it works for you
my way supports this usage
ctx.db.findById(id)
already createdI'm assuming
db there is your repository or a Prisma extended client. What about your services?Everything done the same way, just a namespace on ctx
I think I got it thanks