Module frame_support::pallet_prelude[][src]

Expand description

Prelude to be used alongside pallet macro, for ease of use.


pub use crate::dispatch::DispatchResult;
pub use crate::dispatch::DispatchResultWithPostInfo;
pub use crate::dispatch::Parameter;
pub use crate::ensure;
pub use crate::inherent::ProvideInherent;
pub use crate::storage;
pub use crate::storage::bounded_vec::BoundedVec;
pub use crate::storage::types::OptionQuery;
pub use crate::storage::types::ValueQuery;
pub use crate::weights::DispatchClass;
pub use crate::weights::Pays;
pub use crate::weights::Weight;


Hash storage keys with blake2 128

Hash storage keys with concat(blake2_128(key), key)

Hash storage keys with blake2 256

Implement Get<u32> and Get<Option<u32>> using the given const.

Implement Get by returning Default for any type that implements Default.

Store the key directly.

Inherent data to include in a block.

A type used exclusively by storage maps as their key type.

Zero-sized type used to mark things that “act like” they own a T.

A type that allow to store values for (key1, key2) couple. Similar to StorageMap but allow to iterate and remove value associated to first key.

A type that allow to store value for given key. Allowing to insert/remove/iterate on values.

A type that allow to store values for an arbitrary number of keys in the form of (Key<Hasher1, key1>, Key<Hasher2, key2>, ..., Key<HasherN, keyN>).

A type that allow to store a value.

Hash storage keys with concat(twox64(key), key)

Hash storage keys with twox 128

Hash storage keys with twox 256

Information concerning a valid transaction.


Reason why a dispatch call failed.

An invalid transaction validity.

The source of the transaction.

Errors that can occur while checking the validity of a transaction.

An unknown transaction validity.


Trait that allows zero-copy read of value-references from slices in LE format.

Trait that allows zero-copy write of value-references to slices in LE format.

Some sort of check on the origin is performed by this object.

A trait to define the build function of a genesis config, T and I are placeholder for pallet trait and pallet instance.

A trait for querying a single value from a type.

Provides information about the storage version of a pallet.

The pallet hooks trait. Implementing this lets you express some logic to execute.

Trait to be used when types are exactly same.

Items implementing MaxEncodedLen have a statically known maximum encoded size.

A type that implements Serialize, DeserializeOwned and Debug when in std environment.

A type that can be used in runtime structures.

Provides information about the pallet setup in the runtime.

A trait to give information about storage.

Something that can validate unsigned extrinsics for the transaction pool.

Type Definitions

An identifier for an inherent.

Minimum number of blocks a transaction will remain valid for. TransactionLongevity::max_value() means “forever”.

Priority for a transaction. Additive. Higher is better.

Tag for a transaction. No two transactions with the same tag should be placed on-chain.

Information on a transaction’s validity and, if valid, on how it relates to other transactions.

Derive Macros

Derive Clone but do not bound any generic. Docs are at frame_support::CloneNoBound.

Derive Debug but do not bound any generics. Docs are at frame_support::DebugNoBound.

Derive parity_scale_codec::Decode and for struct and enum.

Derive parity_scale_codec::Encode and parity_scale_codec::EncodeLike for struct and enum.

derive Eq but do no bound any generic. Docs are at frame_support::EqNoBound.

Derive MaxEncodedLen.

Derive PartialEq but do not bound any generic. Docs are at frame_support::PartialEqNoBound.

Derive Debug, if std is enabled it uses frame_support::DebugNoBound, if std is not enabled it just returns "<stripped>". This behaviour is useful to prevent bloating the runtime WASM blob from unneeded code.