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It is not recommended to store and use dates on chain, since dates are not a native measurement of the blockchain. Instead you can use the BlockNumber type, which is going to be a much better unit for …

You really cannot use floating point numbers in the runtime since floating point numbers are not deterministic. You can learn a lot more why with other online resources like this. Instead you should b …

Must all be within the: #[frame_support::pallet] pub mod pallet { ... } And unfortunately, due to Rust not handling cross file macros, these must all be together. …

Substrate chains are designed to be completely modular and without any assumptions about the underlying blockchain. This means that Balances are not necessarily a first class citizen within your runti …

Each client for the different networks are behind feature flags in the Polkadot repo. Take a look at: polkadot/cli/Cargo.toml # Configure the native runtimes to use. Polkadot is enabled by default. # …

You are really mixing up what the generic types mean to you. In one case, you have T represent the AccountId directly, and in the other case you have it represent your Config. Here is a minimal sample …

the official documentation Seems like a pretty good place to learn about benchmarking to me: https://github.com/paritytech/substrate/tree/master/frame/benchmarking Beyond that: 3 Hour Video on Benc …

The easiest way to do this is with JavaScript and using the Polkadot JS APIs. An example for batching transactions can be found here: // construct a list of transactions we want to batch const txs = [ …

Not sure how up to date this library stays, but here is a Substrate library written in Java: https://github.com/emeraldpay/polkaj And here is one in Kotlin: https://github.com/NodleCode/substrate-clie …

This is a general Rust concept: https://doc.rust-lang.org/rust-by-example/testing/dev_dependencies.html Basically, [dev-dependencies] are the crates you only need for compiling and running tests. … Normally, the Rust compiler checks for and prohibits any cyclic dependencies. For [dev-dependencies], this check is ignored, allowing two crates to be dependent on eachother specifically for tests. …

Yes, event name is superficial. What actually matters is how the pallet event is encoded into bytes. Pallet events are encoded such that the first byte represents the pallet index, and the second byte …

You can take a look at the crowdloan pallet in Polkadot to see an example of manipulating and using a child-trie. https://github.com/paritytech/polkadot/blob/master/runtime/common/src/crowdloan/mod.rs …

Balances in most substrate chains are u128, however this is usually opaque, allowing developers to change the type if they want. Converting the value explicitly to u128 is definitely not the right thi …

While you don't have access to std, you do have access to core, and that should have all the tools you need. For example, this should work fine inside of the runtime environment: fn string_to_number(t …

Rather than call Investor::contribute(who,dev.account_id,rent); Seems you should call: Investor::<T::AccountId, u32>::contribute(who,dev.account_id,rent); And just be explicit with your type definiti …