orm: cgen bug fix (fixes #25847)

Author: medvednikov

vlib/orm/orm_func.v

@@ -363,7 +363,9 @@ pub fn (qb_ &QueryBuilder[T]) set(assign string, values ...Primitive) !&QueryBui
 		fields << field
 	}
 	qb.data.fields << fields
-	qb.data.data << values
+	for v in values {
+		qb.data.data << v
+	}
 	return qb
 }
 

vlib/v/gen/c/infix.v

@@ -1055,8 +1055,8 @@ fn (mut g Gen) infix_expr_left_shift_op(node ast.InfixExpr) {
 		if (right.unaliased_sym.kind == .array
 			|| (right.unaliased_sym.kind == .struct && right.unaliased_sym.name == 'array'))
 			&& left.sym.nr_dims() == right.sym.nr_dims() && array_info.elem_type != right.typ
-			&& !elem_is_option && !(right.sym.kind == .alias
-			&& g.table.sumtype_has_variant(array_info.elem_type, node.right_type, false)) {
+			&& !elem_is_option
+			&& !g.table.sumtype_has_variant(array_info.elem_type, node.right_type, false) {
 			// push an array => PUSH_MANY, but not if pushing an array to 2d array (`[][]int << []int`)
 			g.write('_PUSH_MANY${noscan}(')
 			mut expected_push_many_atype := left.typ

vlib/v/tests/sumtype_array_push_array_variant_test.v

@@ -0,0 +1,52 @@
+// vtest flance: -d MOREINFO
+// Test for issue #25847: C error with sumtype arrays
+// Bug: When pushing an array to []SumType where SumType has []SumType as a variant,
+// the compiler incorrectly used PUSH_MANY instead of pushing as a single element.
+
+type Prim = int | string | []Prim
+
+fn test_push_array_literal_to_sumtype_array() {
+	mut args := []Prim{}
+	// Push an array literal as a single element (it should become a Prim variant)
+	args << [Prim(1), Prim(2)]
+	assert args.len == 1
+
+	inner := args[0] as []Prim
+	assert inner.len == 2
+	assert (inner[0] as int) == 1
+	assert (inner[1] as int) == 2
+}
+
+fn test_push_array_variable_to_sumtype_array() {
+	mut args := []Prim{}
+	// Push an array variable as a single Prim element
+	nested := []Prim{len: 2, init: Prim(index)}
+	args << nested
+	assert args.len == 1
+
+	inner := args[0] as []Prim
+	assert inner.len == 2
+}
+
+fn test_push_single_elements_still_works() {
+	mut args := []Prim{}
+	// Push single elements (not arrays)
+	args << 42
+	args << 'hello'
+	args << 123
+	assert args.len == 3
+
+	assert (args[0] as int) == 42
+	assert (args[1] as string) == 'hello'
+	assert (args[2] as int) == 123
+}
+
+fn test_empty_sumtype_array_init() {
+	mut args := []Prim{}
+	assert args.len == 0
+
+	for i in 0 .. 3 {
+		args << i
+	}
+	assert args.len == 3
+}