use crate::db::{ChannelId, ChannelVisibility};use sea_orm::entity::prelude::*; #[derive(Clone, Debug, Default, PartialEq, Eq, DeriveEntityModel)]#[sea_orm(table_name = "channels")]pub struct Model {    #[sea_orm(primary_key)]    pub id: ChannelId,    pub name: String,    pub visibility: ChannelVisibility,    pub parent_path: String,    pub requires_zed_cla: bool,} impl Model {    pub fn parent_id(&self) -> Option<ChannelId> {        self.ancestors().last()    }     pub fn is_root(&self) -> bool {        self.parent_path.is_empty()    }     pub fn root_id(&self) -> ChannelId {        self.ancestors().next().unwrap_or(self.id)    }     pub fn ancestors(&self) -> impl Iterator<Item = ChannelId> + '_ {        self.parent_path            .trim_end_matches('/')            .split('/')            .filter_map(|id| Some(ChannelId::from_proto(id.parse().ok()?)))    }     pub fn ancestors_including_self(&self) -> impl Iterator<Item = ChannelId> + '_ {        self.ancestors().chain(Some(self.id))    }     pub fn path(&self) -> String {        format!("{}{}/", self.parent_path, self.id)    }     pub fn descendant_path_filter(&self) -> String {        format!("{}{}/%", self.parent_path, self.id)    }} impl ActiveModelBehavior for ActiveModel {} #[derive(Copy, Clone, Debug, EnumIter, DeriveRelation)]pub enum Relation {    #[sea_orm(has_one = "super::room::Entity")]    Room,    #[sea_orm(has_one = "super::buffer::Entity")]    Buffer,    #[sea_orm(has_many = "super::channel_member::Entity")]    Member,    #[sea_orm(has_many = "super::channel_buffer_collaborator::Entity")]    BufferCollaborators,    #[sea_orm(has_many = "super::channel_chat_participant::Entity")]    ChatParticipants,} impl Related<super::channel_member::Entity> for Entity {    fn to() -> RelationDef {        Relation::Member.def()    }} impl Related<super::room::Entity> for Entity {    fn to() -> RelationDef {        Relation::Room.def()    }} impl Related<super::buffer::Entity> for Entity {    fn to() -> RelationDef {        Relation::Buffer.def()    }} impl Related<super::channel_buffer_collaborator::Entity> for Entity {    fn to() -> RelationDef {        Relation::BufferCollaborators.def()    }} impl Related<super::channel_chat_participant::Entity> for Entity {    fn to() -> RelationDef {        Relation::ChatParticipants.def()    }}