ActiveModelBehavior

sea-orm-macros/src/derives/active_model.rs

@@ -31,11 +31,17 @@ pub fn expand_derive_active_model(ident: Ident, data: Data) -> syn::Result<Token
     let ty: Vec<Type> = fields.into_iter().map(|Field { ty, .. }| ty).collect();
 
     Ok(quote!(
-        #[derive(Clone, Debug, Default)]
+        #[derive(Clone, Debug)]
         pub struct ActiveModel {
             #(pub #field: sea_orm::ActiveValue<#ty>),*
         }
 
+        impl Default for ActiveModel {
+            fn default() -> Self {
+                <Self as sea_orm::ActiveModelBehavior>::new()
+            }
+        }
+
         impl From<#ident> for ActiveModel {
             fn from(m: #ident) -> Self {
                 Self {
@@ -70,6 +76,12 @@ pub fn expand_derive_active_model(ident: Ident, data: Data) -> syn::Result<Token
                     #(<Self::Entity as EntityTrait>::Column::#name => self.#field = sea_orm::ActiveValue::unset()),*
                 }
             }
+
+            fn default() -> Self {
+                Self {
+                    #(#field: sea_orm::ActiveValue::unset()),*
+                }
+            }
         }
     ))
 }

src/entity/active_model.rs

@@ -44,7 +44,7 @@ where
     ActiveValue::unchanged(value)
 }
 
-pub trait ActiveModelTrait: Clone + Debug + Default {
+pub trait ActiveModelTrait: Clone + Debug {
     type Entity: EntityTrait;
 
     fn take(&mut self, c: <Self::Entity as EntityTrait>::Column) -> ActiveValue<Value>;
@@ -54,6 +54,16 @@ pub trait ActiveModelTrait: Clone + Debug + Default {
     fn set(&mut self, c: <Self::Entity as EntityTrait>::Column, v: Value);
 
     fn unset(&mut self, c: <Self::Entity as EntityTrait>::Column);
+
+    fn default() -> Self;
+}
+
+pub trait ActiveModelBehavior: ActiveModelTrait {
+    type Entity: EntityTrait;
+
+    fn new() -> Self {
+        <Self as ActiveModelTrait>::default()
+    }
 }
 
 impl<V> ActiveValue<V>

src/entity/prelude.rs

@@ -1,6 +1,6 @@
 pub use crate::{
-    ActiveModelTrait, ColumnTrait, ColumnType, DeriveActiveModel, DeriveColumn, DeriveEntity,
+    ActiveModelBehavior, ActiveModelTrait, ColumnTrait, ColumnType, DeriveActiveModel,
-    DeriveModel, DerivePrimaryKey, EntityName, EntityTrait, EnumIter, Iden, IdenStatic, ModelTrait,
+    DeriveColumn, DeriveEntity, DeriveModel, DerivePrimaryKey, EntityName, EntityTrait, EnumIter,
-    PrimaryKeyToColumn, PrimaryKeyTrait, QueryFilter, QueryResult, Related, RelationDef,
+    Iden, IdenStatic, ModelTrait, PrimaryKeyToColumn, PrimaryKeyTrait, QueryFilter, QueryResult,
-    RelationTrait, Select, TypeErr, Value,
+    Related, RelationDef, RelationTrait, Select, TypeErr, Value,
 };

src/tests_cfg/cake.rs

@@ -74,3 +74,7 @@ impl Model {
         Entity::find_related().belongs_to::<Entity>(self)
     }
 }
+
+impl ActiveModelBehavior for ActiveModel {
+    type Entity = Entity;
+}

src/tests_cfg/cake_filling.rs

@@ -54,3 +54,7 @@ impl RelationTrait for Relation {
         }
     }
 }
+
+impl ActiveModelBehavior for ActiveModel {
+    type Entity = Entity;
+}

src/tests_cfg/filling.rs

@@ -57,3 +57,7 @@ impl Model {
         Entity::find_related().belongs_to::<Entity>(self)
     }
 }
+
+impl ActiveModelBehavior for ActiveModel {
+    type Entity = Entity;
+}

src/tests_cfg/fruit.rs

@@ -44,3 +44,7 @@ impl RelationTrait for Relation {
         panic!()
     }
 }
+
+impl ActiveModelBehavior for ActiveModel {
+    type Entity = Entity;
+}