Trait DbResolver 

pub trait DbResolver: Send + Sync {
    // Required method
    fn resolve_query(
        &self,
        ctx: &ResolverContext,
    ) -> Pin<Box<dyn Future<Output = Result<Value, String>> + Send>>;

    // Provided method
    fn resolve_mutation(
        &self,
        ctx: &ResolverContext,
    ) -> Pin<Box<dyn Future<Output = Result<Value, String>> + Send>> { ... }
}

DB Resolver trait — P2-1 修复 C-3

调用方实现此 trait，为 GraphQL root field 提供真实数据。

方法

• resolve_query：解析 Query 字段，返回单个对象或数组
• resolve_mutation：解析 Mutation 字段，返回操作结果

async 实现

使用 Pin<Box<dyn Future>> 返回异步结果，无需 async-trait 依赖。

Required Methods

fn resolve_query( &self, ctx: &ResolverContext, ) -> Pin<Box<dyn Future<Output = Result<Value, String>> + Send>>

解析 Query root field

参数

• ctx：resolver 上下文（字段名、参数等）

返回

• Ok(Value)：解析结果（单个对象为 Value::Object，列表为 Value::Array）
• Err(String)：解析错误

Provided Methods

fn resolve_mutation( &self, ctx: &ResolverContext, ) -> Pin<Box<dyn Future<Output = Result<Value, String>> + Send>>

解析 Mutation root field

默认实现返回错误，调用方按需覆盖。

Dyn Compatibility

This trait is dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementors