Add server

musicus_server/src/database/ensembles.rs

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+use super::schema::ensembles;
+use super::DbConn;
+use anyhow::Result;
+use diesel::prelude::*;
+use diesel::{Insertable, Queryable};
+use serde::{Deserialize, Serialize};
+
+/// An ensemble that takes part in recordings.
+#[derive(Insertable, Queryable, Serialize, Debug, Clone)]
+#[serde(rename_all = "camelCase")]
+pub struct Ensemble {
+    pub id: i64,
+    pub name: String,
+
+    #[serde(skip)]
+    pub created_by: String,
+}
+
+/// A structure representing data on an ensemble.
+#[derive(AsChangeset, Deserialize, Debug, Clone)]
+#[table_name = "ensembles"]
+#[serde(rename_all = "camelCase")]
+pub struct EnsembleInsertion {
+    pub name: String,
+}
+
+/// Insert a new ensemble.
+pub fn insert_ensemble(
+    conn: &DbConn,
+    id: u32,
+    data: &EnsembleInsertion,
+    created_by: &str,
+) -> Result<()> {
+    let ensemble = Ensemble {
+        id: id as i64,
+        name: data.name.clone(),
+        created_by: created_by.to_string(),
+    };
+
+    diesel::insert_into(ensembles::table)
+        .values(ensemble)
+        .execute(conn)?;
+
+    Ok(())
+}
+
+/// Update an existing ensemble.
+pub fn update_ensemble(conn: &DbConn, id: u32, data: &EnsembleInsertion) -> Result<()> {
+    diesel::update(ensembles::table)
+        .filter(ensembles::id.eq(id as i64))
+        .set(data)
+        .execute(conn)?;
+
+    Ok(())
+}
+
+/// Get an existing ensemble.
+pub fn get_ensemble(conn: &DbConn, id: u32) -> Result<Option<Ensemble>> {
+    Ok(ensembles::table
+        .filter(ensembles::id.eq(id as i64))
+        .load::<Ensemble>(conn)?
+        .first()
+        .cloned())
+}
+
+/// Delete an existing ensemble.
+pub fn delete_ensemble(conn: &DbConn, id: u32) -> Result<()> {
+    diesel::delete(ensembles::table.filter(ensembles::id.eq(id as i64))).execute(conn)?;
+    Ok(())
+}
+
+/// Get all existing ensembles.
+pub fn get_ensembles(conn: &DbConn) -> Result<Vec<Ensemble>> {
+    Ok(ensembles::table.load::<Ensemble>(conn)?)
+}