builder update

src/model/historic.rs

@@ -3,7 +3,7 @@ use std::{collections::HashMap, ops::Deref};
 
 /// A struct to keep track of historical changes to a value.
 /// This struct represents a value that has a current state and a history of previous states.
-#[derive(Debug, Clone, Serialize, Deserialize)]
+#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq)]
 pub struct Historic<T> {
     /// The current value
     pub current: T,
@@ -24,6 +24,13 @@ impl<T: Clone> Historic<T> {
     }
 }
 
+impl<T: Default + Clone> Historic<T> {
+    /// Create a new tracked value initialized with Default
+    pub fn new_default() -> Historic<T> {
+        Self::new(T::default())
+    }
+}
+
 impl<T: Clone> Historic<T> {
     /// Update the value. The change will be recorded.
     /// Will record a change even if the value is the same as the current one.

src/model/mod.rs

@@ -18,8 +18,6 @@ pub mod reference;
 pub mod update;
 pub mod valid;
 
-// todo : use mongodb projection to only get fields you actually use, maybe PartialModel shadow struct?
-
 /// Error type when updating a model
 #[derive(Debug)]
 pub enum UpdateError {
@@ -35,6 +33,7 @@ pub trait Model:
     Sized + Referencable + Validate + serde::Serialize + for<'a> serde::Deserialize<'a>
 {
     type Partial: DeserializeOwned;
+    type ChangeBuilder;
 
     /// Insert the `Model` into the database
     fn insert(
@@ -293,6 +292,18 @@ pub trait Model:
         }
     }
 
+    fn change_builder(self) -> Self::ChangeBuilder;
+
+    /// Update values of `Model` using a builder pattern
+    fn change(self) -> Self::ChangeBuilder {
+        #[cfg(feature = "cache")]
+        {
+            mongod::cache_write!().invalidate(Self::collection_name(), self.id());
+        }
+
+        self.change_builder()
+    }
+
     /// Update values of `Model` into database
     fn update(
         &mut self,