Reproduce boolean default value bug

go.mod

@@ -5,17 +5,17 @@ go 1.23.0
 toolchain go1.24.3
 
 require (
-	gorm.io/driver/mysql v1.5.7
-	gorm.io/driver/postgres v1.5.11
-	gorm.io/driver/sqlite v1.5.7
-	gorm.io/driver/sqlserver v1.6.0
+	gorm.io/driver/mysql v1.6.0
+	gorm.io/driver/postgres v1.6.0
+	gorm.io/driver/sqlite v1.6.0
+	gorm.io/driver/sqlserver v1.6.1
 	gorm.io/gen v0.3.27
-	gorm.io/gorm v1.30.0
+	gorm.io/gorm v1.30.1
 )
 
 require (
 	filippo.io/edwards25519 v1.1.0 // indirect
-	github.com/go-sql-driver/mysql v1.9.2 // indirect
+	github.com/go-sql-driver/mysql v1.9.3 // indirect
 	github.com/golang-sql/civil v0.0.0-20220223132316-b832511892a9 // indirect
 	github.com/golang-sql/sqlexp v0.1.0 // indirect
 	github.com/google/uuid v1.6.0 // indirect
@@ -25,16 +25,16 @@ require (
 	github.com/jackc/puddle/v2 v2.2.2 // indirect
 	github.com/jinzhu/inflection v1.0.0 // indirect
 	github.com/jinzhu/now v1.1.5 // indirect
-	github.com/mattn/go-sqlite3 v1.14.28 // indirect
-	github.com/microsoft/go-mssqldb v1.8.1 // indirect
-	golang.org/x/crypto v0.38.0 // indirect
-	golang.org/x/mod v0.24.0 // indirect
-	golang.org/x/sync v0.14.0 // indirect
-	golang.org/x/text v0.25.0 // indirect
-	golang.org/x/tools v0.33.0 // indirect
-	gorm.io/datatypes v1.2.5 // indirect
+	github.com/mattn/go-sqlite3 v1.14.32 // indirect
+	github.com/microsoft/go-mssqldb v1.9.2 // indirect
+	golang.org/x/crypto v0.41.0 // indirect
+	golang.org/x/mod v0.27.0 // indirect
+	golang.org/x/sync v0.16.0 // indirect
+	golang.org/x/text v0.28.0 // indirect
+	golang.org/x/tools v0.36.0 // indirect
+	gorm.io/datatypes v1.2.6 // indirect
 	gorm.io/hints v1.1.2 // indirect
-	gorm.io/plugin/dbresolver v1.6.0 // indirect
+	gorm.io/plugin/dbresolver v1.6.2 // indirect
 )
 
 replace gorm.io/gorm => ./gorm

main_test.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"fmt"
 	"testing"
 )
 
@@ -18,3 +19,53 @@ func TestGORM(t *testing.T) {
 		t.Errorf("Failed, got error: %v", err)
 	}
 }
+
+func TestBooleanDefaultBug(t *testing.T) {
+	// Auto migrate the Tree model
+	if err := DB.AutoMigrate(&Tree{}); err != nil {
+		t.Fatalf("Failed to migrate Tree model: %v", err)
+	}
+
+	// Clean up any existing data
+	DB.Where("1 = 1").Delete(&Tree{})
+
+	// Create a tree with IsAlive explicitly set to false
+	tree := Tree{
+		IsAlive: false,
+		Height:  10.0,
+	}
+
+	if err := DB.Create(&tree).Error; err != nil {
+		t.Fatalf("Failed to create tree: %v", err)
+	}
+
+	// Query the database to check the actual stored values
+	var debugCount struct {
+		IsAliveTrue  int64 `json:"is_alive_true"`
+		IsAliveFalse int64 `json:"is_alive_false"`
+	}
+
+	DB.Model(&Tree{}).Where("is_alive = ?", true).Count(&debugCount.IsAliveTrue)
+	DB.Model(&Tree{}).Where("is_alive = ?", false).Count(&debugCount.IsAliveFalse)
+
+	fmt.Printf("DEBUG: After insert - has %d trees with is_alive=true, %d with is_alive=false\n",
+		debugCount.IsAliveTrue, debugCount.IsAliveFalse)
+
+	// The bug: even though we set IsAlive to false, it might be stored as true due to the default value
+	if debugCount.IsAliveFalse == 0 {
+		t.Errorf("BUG REPRODUCED: Expected 1 tree with is_alive=false, but found %d. The boolean field with default:true cannot be set to false", debugCount.IsAliveFalse)
+	}
+
+	// Verify by reading the record back
+	var retrievedTree Tree
+	if err := DB.First(&retrievedTree, tree.ID).Error; err != nil {
+		t.Fatalf("Failed to retrieve tree: %v", err)
+	}
+
+	t.Logf("Original tree.IsAlive: %v", tree.IsAlive)
+	t.Logf("Retrieved tree.IsAlive: %v", retrievedTree.IsAlive)
+
+	if retrievedTree.IsAlive != false {
+		t.Errorf("BUG REPRODUCED: Expected tree.IsAlive to be false, but got %v", retrievedTree.IsAlive)
+	}
+}

models.go

@@ -58,3 +58,10 @@ type Language struct {
 	Code string `gorm:"primarykey"`
 	Name string
 }
+
+// Tree model to reproduce boolean default value bug
+type Tree struct {
+	ID        uint    `json:"id" gorm:"primaryKey"`
+	IsAlive   bool    `json:"is_alive" gorm:"default:true"`
+	Height    float64 `json:"height" gorm:"type:FLOAT"`
+}