An Anchor validation constraint that asserts a field stored in one account matches the pubkey of another account in the instruction's accounts struct. For example, #[account(has_one = authority)] on a vault account verifies that vault.authority equals the authority account's key. Failing the check returns an Anchor error. has_one prevents unauthorized callers from passing arbitrary accounts for privileged roles.
Comece pela explicação mais curta e útil antes de aprofundar.
An Anchor validation constraint that asserts a field stored in one account matches the pubkey of another account in the instruction's accounts struct. For example, #[account(has_one = authority)] on a vault account verifies that vault.authority equals the authority account's key. Failing the check returns an Anchor error. has_one prevents unauthorized callers from passing arbitrary accounts for privileged roles.
Use primeiro a analogia curta para raciocinar melhor sobre o termo quando ele aparecer em código, docs ou prompts.
Pense nisso como uma ferramenta ou abstração que reduz atrito no workflow de desenvolvimento em Solana.
Coloque o termo dentro da camada de Solana em que ele vive para raciocinar melhor sobre ele.
Anchor, validators locais, explorers, SDKs e fluxos de teste.
Transforme o termo de vocabulário em algo operacional para produto e engenharia.
Este termo destrava conceitos adjacentes rapidamente, então funciona melhor quando você o trata como um ponto de conexão, não como definição isolada.
Use este bloco compacto quando quiser dar contexto aterrado para um agente ou assistente sem despejar a página inteira.
has_one Constraint (Anchor) (has-one-constraint) Categoria: Ferramentas de Dev Definição: An Anchor validation constraint that asserts a field stored in one account matches the pubkey of another account in the instruction's accounts struct. For example, #[account(has_one = authority)] on a vault account verifies that vault.authority equals the authority account's key. Failing the check returns an Anchor error. has_one prevents unauthorized callers from passing arbitrary accounts for privileged roles. Relacionados: Anchor Constraints, Insufficient Account Constraints, Autoridade
Use contexto do glossário, relações entre termos, modelos mentais e builder paths para receber respostas estruturadas em vez de output genérico.
Opcional: cole código Anchor, Solana ou Rust para o Copilot mapear primitivas de volta para termos do glossário.
O Copilot vai responder usando o termo atual, conceitos relacionados, modelos mentais e o grafo ao redor do glossário.
Esses ramos mostram quais conceitos esse termo toca diretamente e o que existe uma camada além deles.
Declarative validation rules on Anchor account fields. Key constraints: `#[account(mut)]` (writable), `#[account(init, payer=x, space=n)]` (create), `#[account(seeds=[...], bump)]` (PDA validation), `#[account(has_one=field)]` (field equality), `#[account(constraint = expr)]` (custom boolean), `#[account(close=target)]` (close and reclaim rent).
A broad vulnerability category in Anchor programs where the account struct's constraint annotations — such as has_one, constraint = expr, seeds, bump, mint, authority, and token::mint — are missing or incomplete, allowing callers to supply accounts that pass deserialization and ownership checks but violate the program's intended relationships. For example, omitting has_one = authority on a vault account means any account can be passed as the authority; omitting mint = token_account.mint on an SPL token account means a different mint's token account could be substituted. Thorough Anchor account structs should declare every meaningful relationship between accounts as a typed constraint.
A pubkey with administrative privileges over a resource—such as the mint authority (can mint tokens), freeze authority (can freeze accounts), upgrade authority (can upgrade a program), or the signer authorized to perform operations on a PDA-controlled account. Authority is a convention, not a runtime concept.
Estes são os próximos conceitos que valem abrir se você quiser que este termo faça mais sentido dentro de um workflow real de Solana.
Essas entradas são fáceis de misturar quando você lê rápido, faz prompting em um LLM ou está entrando em uma nova camada de Solana.
Declarative validation rules on Anchor account fields. Key constraints: `#[account(mut)]` (writable), `#[account(init, payer=x, space=n)]` (create), `#[account(seeds=[...], bump)]` (PDA validation), `#[account(has_one=field)]` (field equality), `#[account(constraint = expr)]` (custom boolean), `#[account(close=target)]` (close and reclaim rent).
Anchor CLI commands for project lifecycle. `anchor init <name>` scaffolds a new project (program, tests, Anchor.toml). `anchor build` compiles to SBF and generates the IDL. `anchor test` builds, starts a local validator, deploys, and runs Mocha/Jest tests. `anchor deploy` deploys to the configured cluster. `anchor verify` checks deployed bytecode.
A major release (March 2025) of the Anchor framework introducing custom discriminators (overriding the default 8-byte discriminator to save transaction space), LazyAccount for on-demand deserialization to reduce compute costs, and stack memory optimizations for init constraints. Positioned as a major milestone on the roadmap toward v1.0.
Entradas de glossário só ficam úteis quando estão conectadas. Esses links são o caminho mais curto para ideias adjacentes.
Declarative validation rules on Anchor account fields. Key constraints: `#[account(mut)]` (writable), `#[account(init, payer=x, space=n)]` (create), `#[account(seeds=[...], bump)]` (PDA validation), `#[account(has_one=field)]` (field equality), `#[account(constraint = expr)]` (custom boolean), `#[account(close=target)]` (close and reclaim rent).
A broad vulnerability category in Anchor programs where the account struct's constraint annotations — such as has_one, constraint = expr, seeds, bump, mint, authority, and token::mint — are missing or incomplete, allowing callers to supply accounts that pass deserialization and ownership checks but violate the program's intended relationships. For example, omitting has_one = authority on a vault account means any account can be passed as the authority; omitting mint = token_account.mint on an SPL token account means a different mint's token account could be substituted. Thorough Anchor account structs should declare every meaningful relationship between accounts as a typed constraint.
A pubkey with administrative privileges over a resource—such as the mint authority (can mint tokens), freeze authority (can freeze accounts), upgrade authority (can upgrade a program), or the signer authorized to perform operations on a PDA-controlled account. Authority is a convention, not a runtime concept.
Essas entradas vivem ao lado do termo atual e ajudam a página a parecer parte de um grafo maior, não um beco sem saída.
The most popular framework for building Solana programs in Rust. Anchor provides macros (#[program], #[account], #[derive(Accounts)]) that auto-generate boilerplate for account validation, serialization, discriminators, and error handling. It includes a CLI (anchor init/build/test/deploy), IDL generation, and TypeScript client generation. Reduces program code by ~80% compared to native development.
The Anchor macro applied to structs to define on-chain account data layouts. `#[account]` auto-derives Borsh serialization, adds an 8-byte discriminator prefix (SHA-256 of 'account:<Name>'), and implements space calculation. Optional attributes: `#[account(zero_copy)]` for zero-copy deserialization of large accounts.
The Anchor macro that defines the accounts struct for an instruction. Each field specifies an account with validation constraints. Account types include: `Account<'info, T>` (deserialized), `Signer<'info>` (must sign), `Program<'info, T>` (program reference), `SystemAccount<'info>`, and `UncheckedAccount<'info>` (no validation, use carefully).
Declarative validation rules on Anchor account fields. Key constraints: `#[account(mut)]` (writable), `#[account(init, payer=x, space=n)]` (create), `#[account(seeds=[...], bump)]` (PDA validation), `#[account(has_one=field)]` (field equality), `#[account(constraint = expr)]` (custom boolean), `#[account(close=target)]` (close and reclaim rent).