Make articleid a String, like Vereinsflieger defines it

firmware/config-example.json

@@ -15,5 +15,5 @@
   "vf-cid": 0,
 
   // Vereinsflieger article id to use for purchases
-  "vf-article-id": 0
+  "vf-article-id": "1234"
 }

firmware/src/article.rs

@@ -3,7 +3,7 @@ use alloc::string::String;
 /// Article id
 /// Equivalent to the Vereinsflieger `articleid` attribute
 #[allow(clippy::module_name_repetitions)]
-pub type ArticleId = u32;
+pub type ArticleId = String;
 
 /// Article information
 #[derive(Debug, Clone, PartialEq)]
@@ -38,8 +38,8 @@ impl<const N: usize> Articles<N> {
     }
 
     /// Update article with given article id. Ignores article ids not in list.
-    pub fn update(&mut self, id: ArticleId, name: String, price: f32) {
-        if let Some(idx) = self.ids.iter().position(|i| *i == id) {
+    pub fn update(&mut self, id: &ArticleId, name: String, price: f32) {
+        if let Some(idx) = self.find(id) {
             self.articles[idx] = Some(Article { name, price });
         }
     }
@@ -49,10 +49,15 @@ impl<const N: usize> Articles<N> {
         self.articles.iter().filter(|a| a.is_some()).count()
     }
 
+    /// Find index of article with given id
+    pub fn find(&self, id: &ArticleId) -> Option<usize> {
+        self.ids.iter().position(|i| i == id)
+    }
+
     /// Look up id of article at given index
     #[allow(dead_code)]
-    pub fn id(&self, index: usize) -> Option<ArticleId> {
-        self.ids.get(index).copied()
+    pub fn id(&self, index: usize) -> Option<&ArticleId> {
+        self.ids.get(index)
     }
 
     /// Look up article information at given index

firmware/src/ui.rs

@@ -186,11 +186,11 @@ impl<'a, I2C: I2c, IRQ: Wait<Error = Infallible>> Ui<'a, I2C, IRQ> {
         let _user = self.users.get(userid);
         // Ask for number of drinks
         let num_drinks = self.get_number_of_drinks().await?;
-        // Get article price
-        let price = self.articles.get(0).ok_or(Error::ArticleNotFound)?.price;
+        // Get article information
+        let article = self.articles.get(0).ok_or(Error::ArticleNotFound)?;
         // Calculate total price. It's ok to cast num_drinks to f32 as it's always a small number.
         #[allow(clippy::cast_precision_loss)]
-        let total_price = price * num_drinks as f32;
+        let total_price = article.price * num_drinks as f32;
         // Show total price and ask for confirmation
         self.confirm_purchase(num_drinks, total_price).await?;
 

firmware/src/vereinsflieger/proto_articles.rs

@@ -57,7 +57,7 @@ impl<const N: usize> FromJsonObject for ArticleListResponse<N> {
                     // articles directly to the article lookup table and only keeps the articles
                     // needed, which heavily reduces memory consumption.
                     let mut articles = context.borrow_mut();
-                    articles.update(article.articleid, article.designation.clone(), price);
+                    articles.update(&article.articleid, article.designation, price);
                 } else {
                     warn!(
                         "Ignoring article with no valid price ({}): {}",
@@ -74,7 +74,7 @@ impl<const N: usize> FromJsonObject for ArticleListResponse<N> {
 /// Article
 #[derive(Debug, Default)]
 pub struct Article {
-    pub articleid: u32,
+    pub articleid: String,
     pub designation: String,
     pub unittype: String,
     pub prices: Vec<ArticlePrice>,
@@ -90,7 +90,7 @@ impl FromJsonObject for Article {
         _context: &Self::Context<'_>,
     ) -> Result<(), json::Error<R::Error>> {
         match &*key {
-            "articleid" => self.articleid = json.read_any().await?.try_into()?,
+            "articleid" => self.articleid = json.read().await?,
             "designation" => self.designation = json.read().await?,
             "unittype" => self.unittype = json.read().await?,
             "prices" => self.prices = json.read().await?,