use crate::db::{ProjectId, Result, RoomId, ServerId, UserId};use anyhow::anyhow;use rpc::ConnectionId;use sea_orm::entity::prelude::*; #[derive(Clone, Debug, PartialEq, Eq, DeriveEntityModel)]#[sea_orm(table_name = "projects")]pub struct Model {    #[sea_orm(primary_key)]    pub id: ProjectId,    pub room_id: Option<RoomId>,    pub host_user_id: Option<UserId>,    pub host_connection_id: Option<i32>,    pub host_connection_server_id: Option<ServerId>,} impl Model {    pub fn host_connection(&self) -> Result<ConnectionId> {        let host_connection_server_id = self            .host_connection_server_id            .ok_or_else(|| anyhow!("empty host_connection_server_id"))?;        let host_connection_id = self            .host_connection_id            .ok_or_else(|| anyhow!("empty host_connection_id"))?;        Ok(ConnectionId {            owner_id: host_connection_server_id.0 as u32,            id: host_connection_id as u32,        })    }} #[derive(Copy, Clone, Debug, EnumIter, DeriveRelation)]pub enum Relation {    #[sea_orm(        belongs_to = "super::user::Entity",        from = "Column::HostUserId",        to = "super::user::Column::Id"    )]    HostUser,    #[sea_orm(        belongs_to = "super::room::Entity",        from = "Column::RoomId",        to = "super::room::Column::Id"    )]    Room,    #[sea_orm(has_many = "super::worktree::Entity")]    Worktrees,    #[sea_orm(has_many = "super::project_collaborator::Entity")]    Collaborators,    #[sea_orm(has_many = "super::language_server::Entity")]    LanguageServers,} impl Related<super::user::Entity> for Entity {    fn to() -> RelationDef {        Relation::HostUser.def()    }} impl Related<super::room::Entity> for Entity {    fn to() -> RelationDef {        Relation::Room.def()    }} impl Related<super::worktree::Entity> for Entity {    fn to() -> RelationDef {        Relation::Worktrees.def()    }} impl Related<super::project_collaborator::Entity> for Entity {    fn to() -> RelationDef {        Relation::Collaborators.def()    }} impl Related<super::language_server::Entity> for Entity {    fn to() -> RelationDef {        Relation::LanguageServers.def()    }} impl ActiveModelBehavior for ActiveModel {}