Trait QueryBuilder

pub trait QueryBuilder {
    type Ctx: MigrationContext;

    // Required method
    fn build(
        &self,
        ctx: &mut Self::Ctx,
    ) -> impl Future<Output = Result<Query, Error>> + Send;
}

A helper trait for Migration.

With the derive macros, the user’s responsibility is to implement this for a Rust migration, and the proc macro uses it to build an implementation of Migration.

Required Associated Types

type Ctx: MigrationContext

The context for running the migration this query is for.

Required Methods

fn build( &self, ctx: &mut Self::Ctx, ) -> impl Future<Output = Result<Query, Error>> + Send

Asynchronously produce the migration query.

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementors