Fix/eager loading with after select and orderby

src/Eloquent/Model.php

@@ -863,8 +863,12 @@ public static function __callStatic(string $name, array $parameters): mixed
             return $instance->$scope($query, ...$parameters);
         }
 
-        // Forward to Builder (where, orderBy, limit, etc.)
-        return $instance->newQuery()->$name(...$parameters);
+        // Forward to ModelBuilder (select, where, orderBy, limit, etc.) so
+        // every static entry point — not just the hand-written where() —
+        // returns a model-aware builder. Without this, calls like
+        // Model::select(...) leaked the raw Query\Builder, which knows
+        // nothing about relations and breaks with() being chained after it.
+        return static::query()->$name(...$parameters);
     }
 
     // -----------------------------------------------------------------------

src/Eloquent/ModelBuilder.php

@@ -196,6 +196,29 @@ public function getBindings(): array
         return $this->builder->getBindings();
     }
 
+    /**
+     * Eager-load the given relations on this query.
+     *
+     * Unlike Model::with(), which must be the first call in a chain,
+     * this allows with() to be added at any point after select(),
+     * where(), or any other Builder method — matching the behaviour
+     * Eloquent users expect from frameworks like Laravel, where with()
+     * is order-independent:
+     *
+     *   Page::select('id', 'slug')->with('translations')->where(...)->first();
+     *   Page::where(...)->with('translations')->select('id', 'slug')->first();
+     *
+     * Returns an EagerBuilder seeded with the current underlying Builder,
+     * so all constraints already applied (select, where, etc.) are kept.
+     *
+     * @param  string|array<string|int, string|callable> ...$relations
+     * @return EagerBuilder
+     */
+    public function with(string|array ...$relations): EagerBuilder
+    {
+        return (new EagerBuilder($this->builder, $this->modelClass, []))->with(...$relations);
+    }
+
     // -----------------------------------------------------------------------
     // Forward all other Builder methods transparently
     // -----------------------------------------------------------------------
@@ -221,4 +244,4 @@ public function __call(string $name, array $arguments): mixed
 
         return $result;
     }
-}
+}

tests/Integration/RelationsTest.php

@@ -216,6 +216,93 @@ public function test_to_array_includes_eager_loaded_relations(): void
         $this->assertIsArray($alice['posts']);
         $this->assertCount(2, $alice['posts']);
     }
+
+    // -----------------------------------------------------------------------
+    // with() is order-independent when chained after select() / where()
+    //
+    // Regression coverage for: Model::select(...)->with(...) throwing
+    // "Call to unknown method: Foxdb\Query\Builder::with()".
+    //
+    // Root cause: Model::__callStatic() forwarded unmatched static calls
+    // (select, orderBy, limit, ...) straight to the raw Query\Builder
+    // instead of through ModelBuilder, so the result of select() had no
+    // knowledge of with() at all — only Model::with() (the entry point)
+    // returned something that understood eager loading. These tests pin
+    // down that with() now works no matter where it appears in the chain,
+    // matching the order-independent behaviour Eloquent users expect from
+    // frameworks like Laravel.
+    // -----------------------------------------------------------------------
+
+    public function test_with_after_select_eager_loads_relation(): void
+    {
+        $this->seedAll();
+
+        // This exact chain — select() first, with() second — is what
+        // originally raised "Call to unknown method: Builder::with()".
+        $users = RelUser::select('id', 'name')->with('posts')->get();
+
+        $alice = $users->first(fn($u) => $u->name === 'Alice');
+        $this->assertInstanceOf(Collection::class, $alice->posts);
+        $this->assertCount(2, $alice->posts);
+    }
+
+    public function test_with_after_select_and_where_returns_single_model(): void
+    {
+        $this->seedAll();
+
+        // Mirrors the real-world case: select(...)->with([...])->where(...)->first()
+        $user = RelUser::select('id', 'name')
+            ->with('posts')
+            ->where('name', 'Alice')
+            ->first();
+
+        $this->assertInstanceOf(RelUser::class, $user);
+        $this->assertSame('Alice', $user->name);
+        $this->assertInstanceOf(Collection::class, $user->posts);
+        $this->assertCount(2, $user->posts);
+    }
+
+    public function test_with_after_where_before_select_still_works(): void
+    {
+        $this->seedAll();
+
+        $user = RelUser::where('name', 'Alice')
+            ->with('posts')
+            ->select('id', 'name')
+            ->first();
+
+        $this->assertInstanceOf(RelUser::class, $user);
+        $this->assertCount(2, $user->posts);
+    }
+
+    public function test_with_constraint_closure_applies_after_select(): void
+    {
+        $this->seedAll();
+
+        // The reported scenario also relied on a constraint closure
+        // (filtering the eager-loaded relation), not just a bare relation
+        // name — make sure that keeps working through select() too.
+        $alice = RelUser::select('id', 'name')
+            ->with(['posts' => fn($q) => $q->where('title', 'Post 1')])
+            ->where('name', 'Alice')
+            ->first();
+
+        $this->assertCount(1, $alice->posts);
+        $this->assertSame('Post 1', $alice->posts->first()->title);
+    }
+
+    public function test_select_without_with_is_unaffected(): void
+    {
+        // Regression guard: plain select() with no with() in the chain
+        // must keep returning normal model instances, not break or
+        // silently turn into an EagerBuilder/Collection of relations.
+        $this->seedAll();
+
+        $user = RelUser::select('id', 'name')->where('name', 'Alice')->first();
+
+        $this->assertInstanceOf(RelUser::class, $user);
+        $this->assertSame('Alice', $user->name);
+    }
 }
 
 // -----------------------------------------------------------------------
@@ -268,4 +355,4 @@ class RelComment extends Model
     protected string $table    = 'rel_comments';
     protected array  $fillable = ['post_id', 'body'];
     protected bool   $timestamps = false;
-}
+}