Pagination and relationship filtering in sea-orm

[im-trisha]

Hello everyone, thanks for this wonderful library!

I have two HUGE questions:
1.Using .find_with_related.... How am I supposed to filter the related model? I mean like “Find related only if condition X is met, else None”, here's my example:

#[derive(Copy, Clone, Debug, EnumIter, DeriveRelation)]
pub enum Relation {
    #[sea_orm(
        belongs_to = "Entity",
        from = "Column::Overrides",
        to = "Column::Id",
        on_update = "NoAction",
        on_delete = "SetNull"
    )]
    SelfRef,
}

impl Related<Entity> for Entity {
    fn to() -> RelationDef {
        Relation::SelfRef.def()
    }
}

let (food, food_override) = foods::Entity::find_by_id(food_id)
    .filter(foods::Column::Source.ne(Sources::User))
    .find_also_related(foods::Entity)
    // Here, I would like to do something like .filter(related_entity.owned_by.eq(user_id))
    .one(&self.database.clone())
    .await?
    .ok_or_else(|| ServiceError::FoodServiceError::FoodNotFound))?

2. I can't understand how i can get, in a query with .limit and .skip, the total count (without taking into account the limit and skip) without doing two queries that are really slow. Here's what i am currently using, which is obviously super slow:

let query = foods::Entity::find().filter(SomeEnormousAndSlowFilter)
let foods_count = query.clone().count(&self.database.clone()).await?;
let foods = query.limit(100).skip(100)
    .find_also_related(foods::Entity)
    // something like .filter(related_entity.owned_by.eq(user_id))
    .all(&self.database.clone())
    .await?
    .into_iter()
    .map(|(food, food_override)| FoodWithOverride {
        food,
        food_override,
    });