fix(contrib/drivers/pgsql): fix insert error when data struct field has nil in PgSQL (#3679)

contrib/drivers/pgsql/pgsql_convert.go

@@ -12,6 +12,7 @@ import (
 	"strings"
 
 	"github.com/gogf/gf/v2/database/gdb"
+	"github.com/gogf/gf/v2/frame/g"
 	"github.com/gogf/gf/v2/text/gregex"
 	"github.com/gogf/gf/v2/text/gstr"
 	"github.com/gogf/gf/v2/util/gconv"
@@ -19,9 +20,11 @@ import (
 
 // ConvertValueForField converts value to database acceptable value.
 func (d *Driver) ConvertValueForField(ctx context.Context, fieldType string, fieldValue interface{}) (interface{}, error) {
-	var (
-		fieldValueKind = reflect.TypeOf(fieldValue).Kind()
-	)
+	if g.IsNil(fieldValue) {
+		return d.Core.ConvertValueForField(ctx, fieldType, fieldValue)
+	}
+
+	var fieldValueKind = reflect.TypeOf(fieldValue).Kind()
 
 	if fieldValueKind == reflect.Slice {
 		// For pgsql, json or jsonb require '[]'

contrib/drivers/pgsql/pgsql_z_unit_issue_test.go

@@ -142,3 +142,33 @@ func Test_Issue3671(t *testing.T) {
 		t.AssertNil(err)
 	})
 }
+
+// https://github.com/gogf/gf/issues/3668
+func Test_Issue3668(t *testing.T) {
+	type Issue3668 struct {
+		Text   interface{}
+		Number interface{}
+	}
+	var (
+		sqlText = gtest.DataContent("issues", "issue3668.sql")
+		table   = fmt.Sprintf(`%s_%d`, TablePrefix+"issue3668", gtime.TimestampNano())
+	)
+	if _, err := db.Exec(ctx, fmt.Sprintf(sqlText, table)); err != nil {
+		gtest.Fatal(err)
+	}
+	defer dropTable(table)
+
+	gtest.C(t, func(t *gtest.T) {
+		var (
+			dao  = db.Model(table)
+			data = Issue3668{
+				Text:   "我们都是自然的婴儿，卧在宇宙的摇篮里",
+				Number: nil,
+			}
+		)
+		_, err := dao.Ctx(ctx).
+			Data(data).
+			Insert()
+		t.AssertNil(err)
+	})
+}

contrib/drivers/pgsql/testdata/issues/issue3668.sql

@@ -0,0 +1,4 @@
+CREATE TABLE "public"."%s" (
+  "text" varchar(255) COLLATE "pg_catalog"."default",
+  "number" int4
+);