Derive Macro DatabaseSetup 

#[derive(DatabaseSetup)]
{
    // Attributes available to this derive:
    #[sql]
}

Composes database structure from nested types.

Implements DatabaseSetup by calling setup on each field (in order), which makes it easy to group tables or other setup structs into reusable schemas.

• Works with named or tuple structs.
• Use #[sql(drivers = Driver1, Driver2)] to select supported drivers when no defaults are configured in the build script via sql_build::build.
• Errors include the field name and type to help trace failing setup calls.

Basic usage

#[derive(Table)]
struct DocUsers {
    #[sql(primary_key)]
    id: i32,
    email: String,
}

#[derive(Table)]
struct DocPosts {
    #[sql(primary_key)]
    id: i32,
    title: String,
}

#[derive(DatabaseSetup)]
struct DocSchema {
    users: DocUsers,
    posts: DocPosts,
}

Nested setup groups

#[derive(Table)]
struct DocUsers {
    #[sql(primary_key)]
    id: i32,
    name: String,
}

#[derive(Table)]
struct DocPosts {
    #[sql(primary_key)]
    id: i32,
    #[sql(foreign_key = DocUsers, cascade)]
    user_id: i32,
    title: String,
}

#[derive(Table)]
struct DocComments {
    #[sql(primary_key)]
    id: i32,
    #[sql(foreign_key = DocPosts, cascade)]
    post_id: i32,
    body: String,
}

#[derive(DatabaseSetup)]
#[sql(drivers = ExampleDriver)]
struct UserTables {
    users: DocUsers,
}

#[derive(DatabaseSetup)]
struct ContentTables {
    posts: DocPosts,
    comments: DocComments,
}

Notes

• Every field must implement DatabaseSetup for the selected driver(s).
• Setup order follows field order;