is there a function in the coroutines lib that tra...

# coroutines

[stojan]

is there a function in the coroutines lib that transforms a List<Flow<T>> to Flow<List<T>> ?

[stojan]

I have a list of ids - List<Long>

for each ID I'm calling Room, which returns a Flow<T>

so by doing list.map { db.getItem(it) } I get List<Flow<T>>

[ephemient]

combine(flows) { it.toList() }

[hfhbd]

depends on you your usecase: How do you want to merge the flows?

[ephemient]

that being said, maybe you should change your room query to accept a list of IDs?

[stojan]

I think combine is what I was looking for.... somehow I missed combine that accepts a List

[stojan]

thanks 🙏

[ephemient]

e.g.

@Query("SELECT * FROM table WHERE id IN (:ids)")
fun getByIds(ids: List<Long>): Flow<List<Model>>

[ephemient]

less sqlite IO and less post-processing work

[stojan]

list is up to 5 elements, so I think it's fine in code... but thanks for the tip