When declaring storage items inside the runtime, we can automatically generate getters to query that storage item, for example (https://docs.substrate.io/v3/runtime/storage/#declaring-`storage-items`)`:

#[pallet::getter(fn some_primitive_value)]
pub(super) type SomePrimitiveValue<T> = StorageValue<_, u32, ValueQuery>;

Is there a simple way to generate a setter in the same way? While a simple setter is likely undesirable on all storage items, it would be handy to have a shorthand way to set storage values from root or signed accounts:

#[pallet::root_setter(fn some_primitive_value)]
#[pallet::signed_setter(fn some_primitive_value)]

1 Answer 1


There is not a way with our macros, and generally I would suggest not even to use this feature.

When you include #[pallet::getter(fn some_primitive_value)] all that is happening is the generation of the following function:

fn some_primitive_value() -> u32 {

So really you have not saved much code writing, and you have created some macro magic abstraction.

Similarly, if you wanted to write a "setter", you can just write:

fn set_some_primitive_value(value: u32) {
  • So using the pallet::getter macro is fully optional? Mar 22, 2022 at 16:45
  • 1
    yes. it is exactly equivalent to writing the function I wrote above inside imp<T: Config> for Pallet<T>
    – Shawn Tabrizi
    Mar 22, 2022 at 16:53
  • 1
    Yes, this is also the practice adopted by Phala Network
    – h4x3rotab
    Mar 23, 2022 at 6:34

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