From 0dc4e3edb3f9021b02ed6f80d54cb88d2ef9b025 Mon Sep 17 00:00:00 2001
From: Robert Farr <robert.farr@procore.com>
Date: Wed, 29 Jan 2025 11:33:52 -0600
Subject: [PATCH] fix(pgdialect): handle nill array on jsonb column

---
 dialect/pgdialect/array_parser.go | 5 +++++
 internal/dbtest/pg_test.go        | 7 +++++++
 2 files changed, 12 insertions(+)

diff --git a/dialect/pgdialect/array_parser.go b/dialect/pgdialect/array_parser.go
index b0eba379b..56db9fd07 100644
--- a/dialect/pgdialect/array_parser.go
+++ b/dialect/pgdialect/array_parser.go
@@ -18,6 +18,11 @@ type arrayParser struct {
 func newArrayParser(b []byte) *arrayParser {
 	p := new(arrayParser)
 
+	if b[0] == 'n' {
+		p.p.Reset(nil)
+		return p
+	}
+
 	if len(b) < 2 || (b[0] != '{' && b[0] != '[') || (b[len(b)-1] != '}' && b[len(b)-1] != ']') {
 		p.err = fmt.Errorf("pgdialect: can't parse array: %q", b)
 		return p
diff --git a/internal/dbtest/pg_test.go b/internal/dbtest/pg_test.go
index 53be846cc..3228ea92f 100644
--- a/internal/dbtest/pg_test.go
+++ b/internal/dbtest/pg_test.go
@@ -922,6 +922,7 @@ func TestPostgresJSONB(t *testing.T) {
 		ItemPtr   *Item    `bun:",type:jsonb"`
 		Items     []Item   `bun:",type:jsonb"`
 		ItemsP    []*Item  `bun:",type:jsonb"`
+		ItemsNull []*Item  `bun:",type:jsonb"`
 		TextItemA []UserID `bun:"type:text[]"`
 	}
 
@@ -939,6 +940,7 @@ func TestPostgresJSONB(t *testing.T) {
 		ItemPtr:   &item2,
 		Items:     []Item{item1, item2},
 		ItemsP:    []*Item{&item1, &item2},
+		ItemsNull: nil,
 		TextItemA: []UserID{uid1, uid2},
 	}
 	_, err := db.NewInsert().Model(model1).Exec(ctx)
@@ -962,4 +964,9 @@ func TestPostgresJSONB(t *testing.T) {
 	require.NoError(t, err)
 	require.Equal(t, []Item{item1, item2}, items)
 
+	err = db.NewSelect().Model((*Model)(nil)).
+		Column("items_null").
+		Scan(ctx, pgdialect.Array(&items))
+	require.NoError(t, err)
+	require.Equal(t, []Item{}, items)
 }