What's the difference between Entity and Model?

[alper]

I still don't get it.

And why do I get this unused stuff in the generated file?

#[derive(Copy, Clone, Debug, EnumIter)]
pub enum Relation {}

impl RelationTrait for Relation {
    fn def(&self) -> RelationDef {
        panic!("No RelationDef")
    }
}

impl ActiveModelBehavior for ActiveModel {}

[billy1624]

Hey @alper, it's just a placeholder when a entity doesn't have relation with other entities.

[alper]

Can we not have it in that case? I tried removing it but that errors.

[tyt2y3]

Umm the current type system requires a Relation associated type on Entity so we need these stub. We can either generate these inside a macro to hide it from plain sight, or rework the Entity type system.

[tyt2y3]

Basically whether we should have Entity and EntityWithRelation

[billy1624]

Actually, this works.

#[derive(Copy, Clone, Debug, EnumIter, DeriveRelation)]
pub enum Relation {}

will be expanded into

pub enum Relation {}

impl sea_orm::entity::RelationTrait for Relation {
    fn def(&self) -> sea_orm::entity::RelationDef {
        match self {
            _ => panic!("No RelationDef for Relation")
        }
    }
}

I will update the codegen and all related examples

[eduhenke]

you can also simply match with no arms match *self {} and it type-checks.