[英]How do I compare the trait type with the string type in substrate module?
[英]How can I convert the block number into the Integer type in substrate module?
我正在测试substrate off-chain worker,我想要做的是接收当前的块号,然后做一些计算,就像下面的代码if (get_block / 10 == 0)
一样,我得到了一些错误。 如何将块号转换为 Integer 类型?
use frame_support::{decl_storage, decl_module, dispatch::DispatchResult, debug};
use frame_system::{ensure_signed, offchain};
use sp_runtime::{
offchain::http,
transaction_validity::{
TransactionValidity, TransactionLongevity, ValidTransaction, InvalidTransaction
}
};
pub trait Trait: frame_system::Trait {}
decl_storage! {
trait Store for Module<T: Trait> as Runtime_example {
SubjectCount: u32;
}
}
decl_module! {
pub struct Module<T: Trait> for enum Call where origin: T::Origin {
fn offchain_worker(block: T::BlockNumber){
let get_block = block;
if (get_block / 10 == 0) {
debug::info!("print !!!!!!!!!!!!!!!!");
}
}
}
}
error[E0308]: mismatched types
--> /home/substrate-node-template/runtime/src/runtime_example.rs:32:29
|
32 | if (get_block / 10 == 0) {
| ^ expected associated type, found integer
|
= note: expected associated type `<T as frame_system::Trait>::BlockNumber`
found type `{integer}`
= help: consider constraining the associated type `<T as frame_system::Trait>::BlockNumber` to `{integer}` or calling a method that returns `<T as frame_system::Trait>::BlockNumber`
error[E0308]: mismatched types
--> /home/substrate-node-template/runtime/src/runtime_example.rs:32:34
|
32 | if (get_block / 10 == 0) {
| ^ expected associated type, found integer
|
= note: expected associated type `<T as frame_system::Trait>::BlockNumber`
found type `{integer}`
= help: consider constraining the associated type `<T as frame_system::Trait>::BlockNumber` to `{integer}` or calling a method that returns `<T as frame_system::Trait>::BlockNumber`
@kmdreko 是对的。 您不想将块号转换为 integer,而是将 integer 转换为块号,然后进行数学运算。
所以替换:
get_block / 10 == 0
和:
(get_block / 10.into()).is_zero()
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