Toast message when scheduling a recipe

backend/src/data/db/recipe.rs

@@ -1,9 +1,15 @@
-use chrono::{prelude::*, Days};
+use chrono::prelude::*;
 use common::ron_api::Difficulty;
 use itertools::Itertools;
+use sqlx::Error;
 
 use super::{Connection, DBError, Result};
-use crate::{data::model, user_authentication};
+use crate::data::model;
+
+pub enum AddScheduledRecipeResult {
+    Ok,
+    RecipeAlreadyScheduledAtThisDate,
+}
 
 impl Connection {
     /// Returns all the recipe titles where recipe is written in the given language.
@@ -758,8 +764,8 @@ VALUES ($1, $2)
         recipe_id: i64,
         date: NaiveDate,
         servings: u32,
-    ) -> Result<()> {
-        sqlx::query(
+    ) -> Result<AddScheduledRecipeResult> {
+        match sqlx::query(
             r#"
 INSERT INTO [RecipeScheduled] (user_id, recipe_id, date, servings)
 VALUES ($1, $2, $3, $4)
@@ -771,8 +777,15 @@ VALUES ($1, $2, $3, $4)
         .bind(servings)
         .execute(&self.pool)
         .await
-        .map(|_| ())
-        .map_err(DBError::from)
+        {
+            Err(Error::Database(error))
+                if error.code() == Some(std::borrow::Cow::Borrowed("2067"))
+                && error.message() == "UNIQUE constraint failed: RecipeScheduled.user_id, RecipeScheduled.recipe_id, RecipeScheduled.date" =>
+            {
+                Ok(AddScheduledRecipeResult::RecipeAlreadyScheduledAtThisDate)
+            }
+            _ => Ok(AddScheduledRecipeResult::Ok),
+        }
     }
 
     pub async fn rm_scheduled_recipe(
@@ -783,9 +796,9 @@ VALUES ($1, $2, $3, $4)
     ) -> Result<()> {
         sqlx::query(
             r#"
-DELETE FROM [RecipeScheduled]
-WHERE [user_id] = $1 AND [recipe_id] = $2 AND [date] = $3
-            "#,
+    DELETE FROM [RecipeScheduled]
+    WHERE [user_id] = $1 AND [recipe_id] = $2 AND [date] = $3
+                "#,
         )
         .bind(user_id)
         .bind(recipe_id)
@@ -823,6 +836,7 @@ ORDER BY [date]
 #[cfg(test)]
 mod tests {
     use super::*;
+    use chrono::Days;
 
     #[tokio::test]
     async fn create_a_new_recipe_then_update_its_title() -> Result<()> {
@@ -1007,6 +1021,14 @@ VALUES
             ]
         );
 
+        // Recipe scheduled at the same date is forbidden.
+        let Ok(AddScheduledRecipeResult::RecipeAlreadyScheduledAtThisDate) = connection
+            .add_scheduled_recipe(user_id, recipe_id_1, today, 4)
+            .await
+        else {
+            panic!("DBError::RecipeAlreadyScheduledAtThisDate must be returned");
+        };
+
         connection
             .rm_scheduled_recipe(user_id, recipe_id_1, today)
             .await?;

backend/src/data/db/user.rs

@@ -945,6 +945,7 @@ VALUES
                 1,
                 Some("muaddib@fremen.com"),
                 Some("muaddib"),
+                None,
                 Some("Chani"),
             )
             .await?