Initial model + some various changes

backend/src/model.rs

@@ -1,10 +1,14 @@
 struct Recipe {
-   ingredients: Vec<Ingredient>,
-   process: Vec<Group>,
+    title: String,
+    estimate_time: Option<i32>, // [min].
+    difficulty: Option<Difficulty>,
+
+    //ingredients: Vec<Ingredient>, // For four people.
+    process: Vec<Group>,
 }
 
 struct Ingredient {
-    quantity: Quantity,
+    quantity: Option<Quantity>,
     name: String,
 }
 
@@ -12,15 +16,16 @@ struct Quantity {
     value: f32,
     unit: String,
 }
+
 struct Group {
-    name: String,
+    name: Option<String>,
     steps: Vec<Step>,
 }
 
 struct Step {
-   action: String,
-   input: Vec<StepInput>,
-   output: Vec<IntermediateSubstance>,
+    action: String,
+    input: Vec<StepInput>,
+    output: Vec<IntermediateSubstance>,
 }
 
 struct IntermediateSubstance {
@@ -30,5 +35,12 @@ struct IntermediateSubstance {
 
 enum StepInput {
     Ingredient(Ingredient),
-    IntermediateSubstance,
-}
+    IntermediateSubstance(IntermediateSubstance),
+}
+
+enum Difficulty {
+    Unknown,
+    Easy,
+    Medium,
+    Hard,
+}