add group routes

migration.sql

@@ -39,7 +39,7 @@ CREATE TABLE group_station (
     station_id INTEGER,
     points INTEGER,
     notes TEXT,
-    arrived_at DATETIME,
+    arrived_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
     started_at DATETIME,
     left_at DATETIME,
     PRIMARY KEY (group_id, station_id),

src/group/mod.rs

@@ -0,0 +1,173 @@
+use crate::{route::Route, station::Station};
+use axum::Router;
+use serde::{Deserialize, Serialize};
+use sqlx::{FromRow, SqlitePool};
+use std::sync::Arc;
+
+mod web;
+
+#[derive(FromRow, Debug, Serialize, Deserialize)]
+pub(crate) struct Group {
+    pub(crate) id: i64,
+    pub(crate) name: String,
+    notes: Option<String>,
+    amount_people: Option<i64>,
+    first_station_id: i64,
+    route_id: i64,
+}
+
+enum CreateError {
+    NoStationForRoute,
+    DuplicateName(String),
+}
+
+impl Group {
+    pub(crate) async fn all(db: &SqlitePool) -> Vec<Self> {
+        sqlx::query_as::<_, Self>(
+            "SELECT id, name, notes, amount_people, first_station_id, route_id FROM 'group';",
+        )
+        .fetch_all(db)
+        .await
+        .unwrap()
+    }
+
+    pub(crate) async fn all_with_route(db: &SqlitePool, route: &Route) -> Vec<Self> {
+        sqlx::query_as!(
+            Group,
+            "select id, name, notes, amount_people, first_station_id, route_id from 'group' where route_id = ?;",
+            route.id
+        )
+        .fetch_all(db)
+        .await
+        .unwrap()
+    }
+
+    pub(crate) async fn all_with_first_station(db: &SqlitePool, station: &Station) -> Vec<Self> {
+        sqlx::query_as!(
+            Group,
+            "select id, name, notes, amount_people, first_station_id, route_id from 'group' where first_station_id = ?;",
+            station.id
+        )
+        .fetch_all(db)
+        .await
+        .unwrap()
+    }
+
+    pub async fn find_by_id(db: &SqlitePool, id: i64) -> Option<Self> {
+        sqlx::query_as!(
+            Self,
+            "SELECT id, name, notes, amount_people, first_station_id, route_id FROM 'group' WHERE id = ?",
+            id
+        )
+        .fetch_one(db)
+        .await
+        .ok()
+    }
+
+    async fn create(db: &SqlitePool, name: &str, route: &Route) -> Result<(), CreateError> {
+        // get next station id which has the lowest amount of groups to have in the first place
+        // assigned
+        let Some(station) = route.get_next_first_station(db).await else {
+            return Err(CreateError::NoStationForRoute);
+        };
+
+        sqlx::query!(
+            "INSERT INTO 'group'(name, route_id, first_station_id) VALUES (?, ?, ?)",
+            name,
+            route.id,
+            station.id
+        )
+        .execute(db)
+        .await
+        .map_err(|e| CreateError::DuplicateName(e.to_string()))?;
+        Ok(())
+    }
+
+    async fn update_name(&self, db: &SqlitePool, name: &str) {
+        sqlx::query!("UPDATE 'group' SET name = ? WHERE id = ?", name, self.id)
+            .execute(db)
+            .await
+            .unwrap();
+    }
+
+    async fn update_notes(&self, db: &SqlitePool, notes: &str) {
+        sqlx::query!("UPDATE 'group' SET notes = ? WHERE id = ?", notes, self.id)
+            .execute(db)
+            .await
+            .unwrap();
+    }
+
+    async fn update_amount_people(&self, db: &SqlitePool, amount_people: i64) {
+        sqlx::query!(
+            "UPDATE 'group' SET amount_people = ? WHERE id = ?",
+            amount_people,
+            self.id
+        )
+        .execute(db)
+        .await
+        .unwrap();
+    }
+
+    async fn update_route(&self, db: &SqlitePool, route: &Route) -> Result<String, ()> {
+        let Some(station) = route.get_next_first_station(db).await else {
+            return Err(());
+        };
+
+        sqlx::query!(
+            "UPDATE 'group' SET route_id = ?, first_station_id = ? WHERE id = ?",
+            route.id,
+            station.id,
+            self.id
+        )
+        .execute(db)
+        .await
+        .unwrap();
+
+        Ok(station.name)
+    }
+
+    async fn update_first_station(&self, db: &SqlitePool, station: &Station) {
+        sqlx::query!(
+            "UPDATE 'group' SET first_station_id = ? WHERE id = ?",
+            station.id,
+            self.id
+        )
+        .execute(db)
+        .await
+        .unwrap();
+    }
+
+    async fn update_amount_people_reset(&self, db: &SqlitePool) {
+        sqlx::query!(
+            "UPDATE 'group' SET amount_people = NULL WHERE id = ?",
+            self.id
+        )
+        .execute(db)
+        .await
+        .unwrap();
+    }
+
+    async fn delete(&self, db: &SqlitePool) -> Result<(), String> {
+        sqlx::query!("DELETE FROM 'group' WHERE id = ?", self.id)
+            .execute(db)
+            .await
+            .map_err(|e| e.to_string())?;
+        Ok(())
+    }
+
+    pub async fn first_station(&self, db: &SqlitePool) -> Station {
+        Station::find_by_id(db, self.first_station_id)
+            .await
+            .expect("db constraints")
+    }
+
+    pub async fn route(&self, db: &SqlitePool) -> Route {
+        Route::find_by_id(db, self.route_id)
+            .await
+            .expect("db constraints")
+    }
+}
+
+pub(super) fn routes() -> Router<Arc<SqlitePool>> {
+    web::routes()
+}

src/group/web.rs

@@ -0,0 +1,534 @@
+use super::{CreateError, Group};
+use crate::{err, partials::page, pl, route::Route, station::Station, succ};
+use axum::{
+    Form, Router,
+    extract::State,
+    response::{IntoResponse, Redirect},
+    routing::{get, post},
+};
+use maud::{Markup, PreEscaped, html};
+use serde::Deserialize;
+use sqlx::SqlitePool;
+use std::sync::Arc;
+use tower_sessions::Session;
+
+#[derive(Deserialize)]
+struct CreateForm {
+    name: String,
+    route_id: i64,
+}
+
+async fn create(
+    State(db): State<Arc<SqlitePool>>,
+    session: Session,
+    Form(form): Form<CreateForm>,
+) -> impl IntoResponse {
+    let Some(route) = Route::find_by_id(&db, form.route_id).await else {
+        err!(
+            session,
+            "Gruppe mit {} konnte nicht erstellt werden, da keine Route mit ID {} existiert",
+            form.name,
+            form.route_id
+        );
+
+        return Redirect::to("/group");
+    };
+
+    match Group::create(&db, &form.name, &route).await {
+        Ok(()) => succ!(session, "Gruppe '{}' erfolgreich erstellt!", form.name),
+        Err(CreateError::DuplicateName(e)) => err!(
+            session,
+            "Gruppe '{}' konnte _NICHT_ erstellt werden, da es bereits eine Gruppe mit diesem Namen gibt ({e})!",
+            form.name
+        ),
+        Err(CreateError::NoStationForRoute) => err!(
+            session,
+            "Gruppe '{}' konnte _NICHT_ erstellt werden, da in der angegebenen Route '{}' noch keine Stationen vorkommen",
+            form.name,
+            route.name
+        ),
+    }
+
+    Redirect::to("/group")
+}
+
+async fn delete(
+    State(db): State<Arc<SqlitePool>>,
+    session: Session,
+    axum::extract::Path(id): axum::extract::Path<i64>,
+) -> impl IntoResponse {
+    let Some(group) = Group::find_by_id(&db, id).await else {
+        err!(
+            session,
+            "Gruppe mit ID {id} konnte nicht gelöscht werden, da sie nicht existiert"
+        );
+
+        return Redirect::to("/group");
+    };
+
+    match group.delete(&db).await {
+        Ok(()) => succ!(session, "Gruppe '{}' erfolgreich gelöscht!", group.name),
+        Err(e) => err!(
+            session,
+            "Gruppe '{}' kann nicht gelöscht werden, da sie bereits verwendet wird. ({e})",
+            group.name
+        ),
+    }
+
+    Redirect::to("/group")
+}
+
+async fn view(
+    State(db): State<Arc<SqlitePool>>,
+    session: Session,
+    axum::extract::Path(id): axum::extract::Path<i64>,
+) -> Result<Markup, impl IntoResponse> {
+    let Some(group) = Group::find_by_id(&db, id).await else {
+        err!(
+            session,
+            "Gruppe mit ID {id} konnte nicht geöffnet werden, da sie nicht existiert"
+        );
+
+        return Err(Redirect::to("/group"));
+    };
+    let first_station = group.first_station(&db).await;
+    let routes = Route::all(&db).await;
+
+    let stations = group.route(&db).await.stations(&db).await;
+
+    // maybe switch to maud-display impl of group
+    let content = html! {
+        h1 {
+            a href="/group" { "↩️" }
+            "Gruppe " (group.name)
+        }
+        article {
+            details {
+                summary { "Gruppennamen bearbeiten ✏️" }
+                form action=(format!("/group/{}/name", group.id)) method="post" {
+                    input type="text" name="name" value=(group.name) required;
+                    input type="submit" value="Speichern";
+                }
+
+            }
+        }
+        table {
+            tbody {
+                tr {
+                    th scope="row" { "Notizen" };
+                    td {
+                        @match &group.notes {
+                            Some(notes) => {
+                                (notes)
+                                details {
+                                summary { "✏️" }
+                                form action=(format!("/group/{}/notes", group.id)) method="post" {
+                                        textarea name="notes" required rows="10" { (notes) };
+                                        input type="submit" value="Speichern";
+                                }
+                            }
+                            },
+                            None => details {
+                                summary { "Neue Notiz hinzufügen" }
+                                form action=(format!("/group/{}/notes", group.id)) method="post" {
+                                        textarea name="notes" required rows="10" {};
+                                        input type="submit" value="Speichern";
+                                }
+                            }
+                        }
+                    }
+                }
+                tr {
+                    th scope="row" { "Anzahl Gruppenmitglieder" };
+                    td {
+                        @match group.amount_people {
+                            Some(amount) => (amount),
+                            None => "?",
+                        }
+                                details {
+                                summary { "✏️" }
+                                form action=(format!("/group/{}/amount-people", group.id)) method="post" {
+                                    input type="number" name="amount_people" min="0" max="10";
+                                    input type="submit" value="Speichern";
+                            }
+                                a href=(format!("/group/{}/amount-people-reset", group.id)) {
+                                    button class="error" {
+                                        em data-tooltip="Ich weiß noch nicht wv. Personen diese Gruppe beherbergt." {
+                                            "?"
+                                        }
+                                    }
+                                }
+                                }
+                    }
+                }
+                tr {
+                    th scope="row" { "Route" };
+                    td {
+                            a href=(format!("/route/{}", &group.route(&db).await.id)) {
+                                (&group.route(&db).await.name)
+                            }
+                        @if routes.len() > 1 {
+                            details {
+                                summary { "✏️" }
+                                form action=(format!("/group/{}/update-route", group.id)) method="post" {
+                                        select name="route_id" aria-label="Route auswählen" required {
+                                            @for route in &routes {
+                                                @if route.id != group.route(&db).await.id {
+                                                    option value=(route.id) {
+                                                        (route.name)
+                                                    }
+                                                }
+                                            }
+                                        }
+                                        input type="submit" value="Gruppe speichern";
+                                }
+                            }
+                        }
+                    }
+                }
+                tr {
+                    th scope="row" {
+                        "Erste Station"
+                        article {
+                            "Die erste Station wird beim Anlegen einer Gruppe automatisch an diejenige Station vergeben, die aktuell am wenigsten Startgruppen hat. Diese Zuteilung kannst du hier auch manuell verändern."
+                        }
+                    };
+                    td {
+                        a href=(format!("/station/{}", first_station.id)) {
+                            (first_station.name)
+                        }
+                        @if stations.len() > 1 {
+                            details {
+                                summary { "✏️" }
+                                form action=(format!("/group/{}/update-first-station", group.id)) method="post" {
+                                        select name="first_station_id" aria-label="Station auswählen" required {
+                                            @for station in &stations {
+                                                @if station.id != first_station.id {
+                                                    option value=(station.id) {
+                                                        (station.name)
+                                                        @let amount_start_groups = Group::all_with_first_station(&db, station).await.len();
+                                                        @if amount_start_groups > 0 {
+                                                        (format!(" (schon {amount_start_groups} {})", pl(amount_start_groups, "Startgruppe")))
+                                                        }
+                                                    }
+                                                }
+                                            }
+                                        }
+                                        input type="submit" value="Station speichern";
+                                }
+                            }
+                        }
+                    }
+                }
+            }
+
+        }
+    };
+    Ok(page(content, session, true).await)
+}
+
+#[derive(Deserialize)]
+struct UpdateNameForm {
+    name: String,
+}
+async fn update_name(
+    State(db): State<Arc<SqlitePool>>,
+    session: Session,
+    axum::extract::Path(id): axum::extract::Path<i64>,
+    Form(form): Form<UpdateNameForm>,
+) -> impl IntoResponse {
+    let Some(group) = Group::find_by_id(&db, id).await else {
+        err!(
+            session,
+            "Gruppe mit ID {id} konnte nicht bearbeitet werden, da sie nicht existiert"
+        );
+
+        return Redirect::to("/group");
+    };
+
+    group.update_name(&db, &form.name).await;
+
+    succ!(
+        session,
+        "Gruppe '{}' heißt ab sofort '{}'.",
+        group.name,
+        form.name
+    );
+
+    Redirect::to(&format!("/group/{id}"))
+}
+
+#[derive(Deserialize)]
+struct UpdateNotesForm {
+    notes: String,
+}
+async fn update_notes(
+    State(db): State<Arc<SqlitePool>>,
+    session: Session,
+    axum::extract::Path(id): axum::extract::Path<i64>,
+    Form(form): Form<UpdateNotesForm>,
+) -> impl IntoResponse {
+    let Some(group) = Group::find_by_id(&db, id).await else {
+        err!(
+            session,
+            "Gruppe mit ID {id} konnte nicht bearbeitet werden, da sie nicht existiert"
+        );
+
+        return Redirect::to("/group");
+    };
+
+    group.update_notes(&db, &form.notes).await;
+
+    succ!(
+        session,
+        "Notizen für die Gruppe '{}' wurden erfolgreich bearbeitet!",
+        group.name
+    );
+
+    Redirect::to(&format!("/group/{id}"))
+}
+
+#[derive(Deserialize)]
+struct UpdateAmountPeopleForm {
+    amount_people: i64,
+}
+async fn update_amount_people(
+    State(db): State<Arc<SqlitePool>>,
+    session: Session,
+    axum::extract::Path(id): axum::extract::Path<i64>,
+    Form(form): Form<UpdateAmountPeopleForm>,
+) -> impl IntoResponse {
+    let Some(group) = Group::find_by_id(&db, id).await else {
+        err!(
+            session,
+            "Gruppe mit ID {id} konnte nicht bearbeitet werden, da sie nicht existiert"
+        );
+
+        return Redirect::to("/group");
+    };
+
+    group.update_amount_people(&db, form.amount_people).await;
+
+    succ!(
+        session,
+        "Anzahl an Mitglieder für die Gruppe '{}' wurden erfolgreich bearbeitet!",
+        group.name
+    );
+
+    Redirect::to(&format!("/group/{id}"))
+}
+
+#[derive(Deserialize)]
+struct UpdateRouteForm {
+    route_id: i64,
+}
+async fn update_route(
+    State(db): State<Arc<SqlitePool>>,
+    session: Session,
+    axum::extract::Path(id): axum::extract::Path<i64>,
+    Form(form): Form<UpdateRouteForm>,
+) -> impl IntoResponse {
+    // TODO: move sanity checks into mod.rs
+    let Some(group) = Group::find_by_id(&db, id).await else {
+        err!(
+            session,
+            "Gruppe mit ID {id} konnte nicht bearbeitet werden, da sie nicht existiert"
+        );
+
+        return Redirect::to("/group");
+    };
+
+    let Some(route) = Route::find_by_id(&db, form.route_id).await else {
+        err!(
+            session,
+            "Konnte Gruppe mit ID {id} konnte nicht zur Route mit ID {} bearbeiten, da diese Route nicht existiert.",
+            form.route_id
+        );
+
+        return Redirect::to(&format!("/group/{id}"));
+    };
+
+    match group.update_route(&db, &route).await {
+        Ok(new_first_station_name) => succ!(
+            session,
+            "Gruppe '{}' laufen ab sofort die Route '{}'. Auch die erste Station hat sich dadurch auf {} verändert!!",
+            group.name,
+            route.name,
+            new_first_station_name
+        ),
+        Err(()) => err!(
+            session,
+            "Konnte für die Gruppe {} nicht die Route {} auswählen, da Route {} keine Stationen zugeteilt hat.",
+            group.name,
+            route.name,
+            route.name
+        ),
+    }
+
+    Redirect::to(&format!("/group/{id}"))
+}
+
+#[derive(Deserialize)]
+struct UpdateFirstStationForm {
+    first_station_id: i64,
+}
+async fn update_first_station(
+    State(db): State<Arc<SqlitePool>>,
+    session: Session,
+    axum::extract::Path(id): axum::extract::Path<i64>,
+    Form(form): Form<UpdateFirstStationForm>,
+) -> impl IntoResponse {
+    let Some(group) = Group::find_by_id(&db, id).await else {
+        err!(
+            session,
+            "Gruppe mit ID {id} konnte nicht bearbeitet werden, da sie nicht existiert"
+        );
+
+        return Redirect::to("/group");
+    };
+
+    let Some(station) = Station::find_by_id(&db, form.first_station_id).await else {
+        err!(
+            session,
+            "Konnte die erste Station (ID={}) der Gruppe mit ID {} nicht bearbeiten, da diese Station nicht existiert.",
+            form.first_station_id,
+            group.id
+        );
+
+        return Redirect::to(&format!("/group/{id}"));
+    };
+
+    if !station.is_in_route(&db, &group.route(&db).await).await {
+        err!(
+            session,
+            "Konnte Station {} nicht der Gruppe {} hinzufügen, weil die Gruppe bei Route {} und nicht bei Route {} mitläuft.",
+            station.name,
+            group.name,
+            group.route(&db).await.name,
+            group.name
+        );
+
+        return Redirect::to(&format!("/group/{id}"));
+    }
+
+    group.update_first_station(&db, &station).await;
+
+    succ!(
+        session,
+        "Erste Station der Gruppe {} ist ab sofort {}",
+        group.name,
+        station.name
+    );
+
+    Redirect::to(&format!("/group/{id}"))
+}
+
+async fn update_amount_people_reset(
+    State(db): State<Arc<SqlitePool>>,
+    session: Session,
+    axum::extract::Path(id): axum::extract::Path<i64>,
+) -> impl IntoResponse {
+    let Some(group) = Group::find_by_id(&db, id).await else {
+        err!(
+            session,
+            "Gruppe mit ID {id} konnte nicht bearbeitet werden, da sie nicht existiert"
+        );
+
+        return Redirect::to("/group");
+    };
+
+    group.update_amount_people_reset(&db).await;
+
+    succ!(
+        session,
+        "Anzahl an Mitglieder für die Gruppe '{}' wurden erfolgreich bearbeitet!",
+        group.name
+    );
+
+    Redirect::to(&format!("/group/{id}"))
+}
+
+async fn index(State(db): State<Arc<SqlitePool>>, session: Session) -> Markup {
+    let groups = Group::all(&db).await;
+    let routes = Route::all(&db).await;
+
+    let content = html! {
+        h1 {
+            a href="/" { "↩️" }
+            "Gruppen"
+        }
+        article {
+            em { "Gruppen " }
+            "sind eine Menge an Personen, die verschiedene "
+            a href="/station" { "Stationen" }
+            " ablaufen. Welche Stationen, entscheidet sich je nachdem, welcher "
+            a href="/route" { "Route" }
+            " sie zugewiesen sind."
+        }
+        ol {
+            @for group in &groups{
+                li {
+                     a href=(format!("/group/{}", group.id)){
+                        (group.name)
+                     }
+                     a href=(format!("/group/{}/delete", group.id))
+                       onclick="return confirm('Bist du sicher, dass die Gruppe gelöscht werden soll? Das kann _NICHT_ mehr rückgängig gemacht werden.');" {
+                         "🗑️"
+                     }
+                }
+            }
+        }
+        @if groups.is_empty() {
+            article class="warning" {
+                "Es gibt noch keine Gruppen. "
+                @if !routes.is_empty() {
+                    "Das kannst du hier ändern ⤵️"
+                }
+            }
+        }
+        h2 { "Neue Gruppe" }
+        @if routes.is_empty() {
+            article class="error" {
+                (PreEscaped("Bevor du einer Gruppe erstellen kannst, musst du zumindest eine Route erstellen, die die Gruppe gehen kann &rarr; "))
+                a role="button" href="/route" {
+                    "Gruppe erstellen"
+                }
+            }
+        } @else {
+            form action="/group" method="post" {
+                @if routes.len() == 1 {
+                    fieldset role="group" {
+                        input type="text" name="name" placeholder="Gruppenname" required;
+                        input type="hidden" name="route_id" value=(routes[0].id) ;
+                        input type="submit" value="Neue Gruppe";
+                    }
+                } @else {
+                    input type="text" name="name" placeholder="Gruppenname" required;
+                    select name="route_id" aria-label="Route auswählen" required {
+                        @for route in &routes {
+                            option value=(route.id) {
+                                (route.name)
+                            }
+                        }
+                    }
+                    input type="submit" value="Neue Gruppe";
+                }
+            }
+        }
+    };
+    page(content, session, false).await
+}
+
+pub(super) fn routes() -> Router<Arc<SqlitePool>> {
+    Router::new()
+        .route("/", get(index))
+        .route("/", post(create))
+        .route("/{id}", get(view))
+        .route("/{id}/delete", get(delete))
+        .route("/{id}/name", post(update_name))
+        .route("/{id}/notes", post(update_notes))
+        .route("/{id}/amount-people", post(update_amount_people))
+        .route("/{id}/amount-people-reset", get(update_amount_people_reset))
+        .route("/{id}/update-route", post(update_route))
+        .route("/{id}/update-first-station", post(update_first_station))
+}

src/lib.rs

@@ -1,14 +1,23 @@
-use axum::{body::Body, response::Response, routing::get, Router};
-use maud::{html, Markup};
+use axum::{Router, body::Body, response::Response, routing::get};
+use maud::{Markup, html};
 use partials::page;
 use sqlx::SqlitePool;
 use std::sync::Arc;
 use tokio::net::TcpListener;
 use tower_sessions::{MemoryStore, Session, SessionManagerLayer};
 
+pub(crate) mod group;
 mod partials;
 pub(crate) mod route;
-pub(crate) mod station; // TODO: find nicer name for this 'associative table'
+pub(crate) mod station;
+
+pub(crate) fn pl(amount: usize, single: &str) -> String {
+    if amount == 1 {
+        single.into()
+    } else {
+        format!("{single}n")
+    }
+}
 
 #[macro_export]
 macro_rules! err {
@@ -111,6 +120,7 @@ pub async fn start(listener: TcpListener, db: SqlitePool) {
         .route("/", get(index))
         .nest("/station", station::routes())
         .nest("/route", route::routes())
+        .nest("/group", group::routes())
         .route("/pico.css", get(serve_pico_css))
         .route("/style.css", get(serve_my_css))
         .route("/leaflet.css", get(serve_leaflet_css))

src/route/mod.rs

@@ -1,7 +1,7 @@
-use crate::station::Station;
+use crate::{group::Group, station::Station};
 use axum::Router;
 use serde::{Deserialize, Serialize};
-use sqlx::{FromRow, SqlitePool};
+use sqlx::{FromRow, Row, SqlitePool};
 use std::sync::Arc;
 
 mod web;
@@ -9,11 +9,11 @@ mod web;
 #[derive(FromRow, Debug, Serialize, Deserialize)]
 pub(crate) struct Route {
     pub(crate) id: i64,
-    name: String,
+    pub(crate) name: String,
 }
 
 impl Route {
-    async fn all(db: &SqlitePool) -> Vec<Self> {
+    pub(crate) async fn all(db: &SqlitePool) -> Vec<Self> {
         sqlx::query_as::<_, Self>("SELECT id, name FROM route;")
             .fetch_all(db)
             .await
@@ -126,7 +126,7 @@ DROP TABLE temp_pos;",
         Ok(())
     }
 
-    async fn stations(&self, db: &SqlitePool) -> Vec<Station> {
+    pub(crate) async fn stations(&self, db: &SqlitePool) -> Vec<Station> {
         sqlx::query_as::<_, Station>(
             "
             SELECT s.id, s.name, s.notes, s.amount_people, s.last_login, s.pw, s.lat, s.lng
@@ -160,6 +160,39 @@ DROP TABLE temp_pos;",
         .await
         .unwrap()
     }
+
+    pub(crate) async fn groups(&self, db: &SqlitePool) -> Vec<Group> {
+        Group::all_with_route(db, self).await
+    }
+
+    pub(crate) async fn get_next_first_station(&self, db: &SqlitePool) -> Option<Station> {
+        let Ok(row) = sqlx::query(&format!(
+            "
+            SELECT 
+                s.id AS next_first_station_id,
+                COUNT(g.id) AS group_count
+            FROM station s
+            JOIN route_station rs ON s.id = rs.station_id
+            LEFT JOIN 'group' g ON s.id = g.first_station_id
+            WHERE rs.route_id = {}
+            GROUP BY s.id
+            ORDER BY group_count ASC, s.id ASC
+           LIMIT 1",
+            self.id
+        ))
+        .fetch_one(db)
+        .await
+        else {
+            return None; // No station for route exists
+        };
+        let next_first_station_id = row.get::<i64, _>("next_first_station_id");
+
+        Some(
+            Station::find_by_id(db, next_first_station_id)
+                .await
+                .expect("db constraints"),
+        )
+    }
 }
 
 pub(super) fn routes() -> Router<Arc<SqlitePool>> {

src/route/web.rs

@@ -1,12 +1,12 @@
 use super::Route;
 use crate::{err, page, station::Station, succ};
 use axum::{
+    Form, Router,
     extract::State,
     response::{IntoResponse, Redirect},
     routing::{get, post},
-    Form, Router,
 };
-use maud::{html, Markup, PreEscaped};
+use maud::{Markup, PreEscaped, html};
 use serde::Deserialize;
 use sqlx::SqlitePool;
 use std::sync::Arc;
@@ -24,7 +24,9 @@ async fn index(State(db): State<Arc<SqlitePool>>, session: Session) -> Markup {
             em { "Routen " }
             "definieren welche "
             a href="/station" { "Stationen" }
-            " von den Teilnehmern in welcher Reihenfolge abgeklappert werden sollen. Wenn es verschiedene Kategorien (zB Kinder- und Erwachsenenwertung) gibt, kannst du auch mehrere Routen mit (teils) überlappenden Stationen erstellen."
+            " von den "
+            a href="/group" { "Gruppen" }
+            " in welcher Reihenfolge abgeklappert werden sollen. Wenn es verschiedene Kategorien (zB Kinder- und Erwachsenenwertung) gibt, kannst du auch mehrere Routen mit (teils) überlappenden Stationen erstellen."
         }
         ol {
             @for route in &routes{
@@ -125,6 +127,8 @@ async fn view(
     let cur_stations = route.stations(&db).await;
     let stations_not_in_route = route.stations_not_in_route(&db).await;
 
+    let groups = route.groups(&db).await;
+
     let content = html! {
         h1 {
             a href="/route" { "↩️" }
@@ -185,6 +189,27 @@ async fn view(
                 }
         }
         }
+        h2 { "Gruppen mit dieser Route" }
+        @if groups.is_empty() {
+            article {
+                "Noch keine Gruppe ist dieser Route zugeteilt."
+                a role="button" href="/group" {
+                    "Zu den Gruppen"
+                }
+
+            }
+        } @else {
+            ol {
+                @for group in &groups {
+                    li {
+                        a href=(format!("/group/{}", group.id)) {
+                            (group.name)
+                        }
+                    }
+                }
+            }
+        }
+
     };
     Ok(page(content, session, false).await)
 }

src/station/mod.rs

@@ -127,6 +127,16 @@ impl Station {
         .await
         .unwrap()
     }
+
+    pub async fn is_in_route(&self, db: &SqlitePool, route: &Route) -> bool {
+        for r in self.routes(db).await {
+            if r.id == route.id {
+                return true;
+            }
+        }
+
+        false
+    }
 }
 
 pub(super) fn routes() -> Router<Arc<SqlitePool>> {