Recently I chose SeaORM when rewriting some modules of a Node.js server in Rust, and I found one important feature that is missing in SeaORM is custom table name prefix. Implementing EntityName manually solves the problem, but it also requires implementing many other structs and traits that could have been generated by DeriveEntityModel, which is a PITA.

Neither Entity and DatabaseConnection is suitable for storing a global table name prefix, so IMO a new ORM manager struct is needed, for example, the initialization becomes

let mut orm: SeaOrm = SeaOrm::new()
   .with_table_name_prefix("my_prefix")
   .with_connection_options(options)
   .build();

let result = my_table::Entity::find().all(&orm).await?;

Currently I've added a table_name_expr attr to the DeriveEntityModel macro in my sea-orm fork, and changed the return type of EntityName::table_name() and related types from &str to Cow<str>, so I can write

#[derive(Clone, Debug, PartialEq, DeriveEntityModel, Eq)]
#[sea_orm(table_name_prefix = r#"prefix("my_table")"#]
pub struct Model {
    ....
}

fn prefix(table_name: &str) -> String {
    format!("{}_{}", std::env::var("TABLE_PREFIX").unwrap(), table_name)
}

It's a bit tedious, but it solves my problem for now.