feat(dojo-core): add support for making multiple model pointers

crates/dojo/core-cairo-test/src/tests/model/model.cairo

@@ -1,8 +1,8 @@
-use dojo::model::{Model, ModelValue, ModelStorage, ModelValueStorage};
+use dojo::model::{Model, ModelValue, ModelStorage, ModelValueStorage, ModelPtr};
 use dojo::world::WorldStorage;
 use dojo_cairo_test::{spawn_test_world, NamespaceDef, TestResource};
 
-#[derive(Copy, Drop, Serde, Debug)]
+#[derive(Copy, Drop, Serde, Debug, PartialEq)]
 #[dojo::model]
 struct Foo {
     #[key]
@@ -194,3 +194,28 @@ fn test_model_ptr_from_entity_id() {
     let v1 = world.read_member(ptr, selector!("v1"));
     assert!(foo.v1 == v1);
 }
+
+#[test]
+fn test_ptr_from() {
+    let foo = Foo { k1: 1, k2: 2, v1: 3, v2: 4 };
+    let ptr_a = ModelPtr::<Foo> { id: foo.entity_id() };
+    let ptr_b = Model::<Foo>::ptr_from_keys(foo.keys());
+    let ptr_c = Model::<Foo>::ptr_from_serialized_keys([foo.k1.into(), foo.k2].span());
+    let ptr_d = Model::<Foo>::ptr_from_id(foo.entity_id());
+    assert!(ptr_a == ptr_b && ptr_a == ptr_c && ptr_a == ptr_d);
+}
+
+fn test_ptrs_from() {
+    let foo = Foo { k1: 1, k2: 2, v1: 3, v2: 4 };
+    let foo2 = Foo { k1: 3, k2: 4, v1: 5, v2: 6 };
+    let ptrs_a = [ModelPtr::<Foo> { id: foo.entity_id() }, ModelPtr::<Foo> { id: foo2.entity_id() }]
+        .span();
+    let ptrs_b = Model::<Foo>::ptrs_from_keys([foo.keys(), foo2.keys()].span());
+    let ptrs_c = Model::<
+        Foo,
+    >::ptrs_from_serialized_keys(
+        [[foo.k1.into(), foo.k2].span(), [foo2.k1.into(), foo2.k2].span()].span(),
+    );
+    let ptrs_d = Model::<Foo>::ptrs_from_ids([foo.entity_id(), foo2.entity_id()].span());
+    assert!(ptrs_a == ptrs_b && ptrs_a == ptrs_c && ptrs_a == ptrs_d);
+}

crates/dojo/core/src/model/model.cairo

@@ -58,17 +58,23 @@ pub trait Model<M> {
     fn definition() -> ModelDef;
     /// Returns the selector of the model computed for the given namespace hash.
     fn selector(namespace_hash: felt252) -> felt252;
-    /// Returns the pointer to the model from the key.
-    fn ptr_from_keys<K, +Serde<K>, +Drop<K>>(keys: K) -> ModelPtr<M>;
     /// Returns the pointer to the model from the keys.
+    fn ptr_from_keys<K, +Serde<K>, +Drop<K>>(keys: K) -> ModelPtr<M>;
+    /// Returns the pointer to the model from the serialised keys.
     fn ptr_from_serialized_keys(keys: Span<felt252>) -> ModelPtr<M>;
     /// Returns the pointer to the model from the entity id.
     fn ptr_from_id(entity_id: felt252) -> ModelPtr<M>;
+    /// Returns the pointers to models from the keys.
+    fn ptrs_from_keys<K, +Serde<K>, +Drop<K>>(keys: Span<K>) -> Span<ModelPtr<M>>;
+    /// Returns the pointers to models from the serialised keys.
+    fn ptrs_from_serialized_keys(keys: Span<Span<felt252>>) -> Span<ModelPtr<M>>;
+    /// Returns the pointers to models from the entity ids.
+    fn ptrs_from_ids(entity_ids: Span<felt252>) -> Span<ModelPtr<M>>;
     /// Returns the ptr of the model.
     fn ptr(self: @M) -> ModelPtr<M>;
 }
 
-pub impl ModelImpl<M, +ModelParser<M>, +ModelDefinition<M>, +Serde<M>> of Model<M> {
+pub impl ModelImpl<M, +ModelParser<M>, +ModelDefinition<M>, +Serde<M>, +Drop<M>> of Model<M> {
     fn keys<K, +KeyParser<M, K>>(self: @M) -> K {
         KeyParser::<M, K>::parse_key(self)
     }
@@ -147,6 +153,30 @@ pub impl ModelImpl<M, +ModelParser<M>, +ModelDefinition<M>, +Serde<M>> of Model<
         ModelPtr::<M> { id: entity_id }
     }
 
+    fn ptrs_from_keys<K, +Serde<K>, +Drop<K>>(keys: Span<K>) -> Span<ModelPtr<M>> {
+        let mut ptrs = ArrayTrait::<ModelPtr<M>>::new();
+        for key in keys {
+            ptrs.append(ModelPtr { id: entity_id_from_keys(key) });
+        };
+        ptrs.span()
+    }
+
+    fn ptrs_from_serialized_keys(keys: Span<Span<felt252>>) -> Span<ModelPtr<M>> {
+        let mut ptrs = ArrayTrait::<ModelPtr<M>>::new();
+        for key in keys {
+            ptrs.append(Self::ptr_from_serialized_keys(*key));
+        };
+        ptrs.span()
+    }
+
+    fn ptrs_from_ids(entity_ids: Span<felt252>) -> Span<ModelPtr<M>> {
+        let mut ptrs = ArrayTrait::<ModelPtr<M>>::new();
+        for entity_id in entity_ids {
+            ptrs.append(Self::ptr_from_id(*entity_id));
+        };
+        ptrs.span()
+    }
+
     fn ptr(self: @M) -> ModelPtr<M> {
         ModelPtr::<M> { id: self.entity_id() }
     }