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A common error in Solana development: instruction not found when using a separate file
When working with Solana, one of the most frustrating errors can be finding an “instruction” field missing from your code. This issue is especially common when developing aggregation strategies that involve multiple instructions. In this article, we will explore why you are encountering this error and provide some solutions to resolve it.
The problem: self reference
In Rust, the &Self; reference refers to the current instance of a type. However, when using a separate file to define an aggregation strategy on the Solana blockchain, this can lead to unexpected behavior. Specifically, if you are trying to use a function that relies on the “instruction” field being present in the current instance (self) but it is not found, you will encounter this error.
The solution: move instructions::Instruction into self
To fix this issue, we need to ensure that instructions::Instruction is available within the scope of the current instance. One way to do this is to move the definition of instructions::Instruction into a separate module or file that can be accessed from both the current instance and any other modules.
An updated version of lib.rs is included below:
use crate::instructions::*;
pub mod instructions {
struct pub instruction;
impl Instructions for Instruction {}
}
// ... (the rest of the code remains the same)
In this example, we move the definition of Instruction into a separate module called instructions. We can then use it in our current instance by referencing self::instructions::Instruction.
Workaround: Define the Instructions trait in a single file
Another approach is to define the Instructions trait and implement it as an empty implementation. This way, we ensure that any type implementing this trait will have access to all of its fields, including the missing “instruction” field.
// instructions.rs
pub trait Instructions {
// ...
}
impl Instructions for Instruction {}
We can then use this trait in our code by referencing self::instructions.
By using one of these solutions, you should be able to resolve the error and successfully compile your Solana aggregation strategy.
