Service for editing/creating recipe

Other stuff...

backend/src/model.rs

@@ -1,22 +1,41 @@
+use chrono::prelude::*;
+
+pub struct User {
+    pub id: i64,
+    pub email: String,
+}
+
+pub struct UserLoginInfo {
+    pub last_login_datetime: DateTime<Utc>,
+    pub ip: String,
+    pub user_agent: String,
+}
+
 pub struct Recipe {
     pub id: i64,
+    pub user_id: i64,
     pub title: String,
-    pub description: Option<String>,
+    pub description: String,
     pub estimate_time: Option<i32>, // [min].
-    pub difficulty: Option<Difficulty>,
+    pub difficulty: Difficulty,
 
     //ingredients: Vec<Ingredient>, // For four people.
     pub process: Vec<Group>,
 }
 
 impl Recipe {
-    pub fn new(id: i64, title: String, description: Option<String>) -> Recipe {
+    pub fn empty(id: i64, user_id: i64) -> Recipe {
+        Self::new(id, user_id, String::new(), String::new())
+    }
+
+    pub fn new(id: i64, user_id: i64, title: String, description: String) -> Recipe {
         Recipe {
             id,
+            user_id,
             title,
             description,
             estimate_time: None,
-            difficulty: None,
+            difficulty: Difficulty::Unknown,
             process: Vec::new(),
         }
     }
@@ -34,13 +53,13 @@ pub struct Quantity {
 
 pub struct Group {
     pub name: Option<String>,
+    pub input: Vec<StepInput>,
+    pub output: Vec<IntermediateSubstance>,
     pub steps: Vec<Step>,
 }
 
 pub struct Step {
     pub action: String,
-    pub input: Vec<StepInput>,
-    pub output: Vec<IntermediateSubstance>,
 }
 
 pub struct IntermediateSubstance {