Added support for default fields on create. Unified logics of default values between update and create

callback.go

@@ -2,6 +2,9 @@ package gorm
 
 import (
 	"fmt"
+	"reflect"
+	"strconv"
+	"strings"
 )
 
 type callback struct {
@@ -203,4 +206,54 @@ func ForceReload(scope *Scope) {
 	}
 }
 
+func escapeIfNeeded(scope *Scope, value string) string {
+	trimmed := strings.TrimSpace(value)
+	// default:'string value' OR
+	if (strings.HasPrefix(trimmed, "'") && strings.HasSuffix(trimmed, "'")) ||
+		strings.HasSuffix(trimmed, ")") { //sql expression, like: default:"(now() at timezone 'utc') or now() or user_defined_function(parameters.. )
+		return trimmed
+	}
+
+	lowered := strings.ToLower(trimmed)
+	if lowered == "null" || strings.HasPrefix(lowered, "current_") { // null and other sql reserved keyworks (used a default values) can't be placed between apices
+		return lowered
+	}
+	return scope.AddToVars(trimmed) // default:'something'  like:default:'false' should be between quotes (what AddToVars do)
+}
+
+func handleDefaultValue(scope *Scope, field *Field) string {
+	if field.IsBlank {
+		defaultValue := strings.TrimSpace(parseTagSetting(field.Tag.Get("sql"))["DEFAULT"])
+		switch field.Field.Kind() {
+		case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
+			if numericValue, err := strconv.ParseInt(defaultValue, 10, 64); err == nil {
+				if numericValue != field.Field.Int() {
+					return escapeIfNeeded(scope, fmt.Sprintf("%d", field.Field.Int()))
+				} else {
+					return escapeIfNeeded(scope, defaultValue)
+				}
+			}
+		case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
+			if numericValue, err := strconv.ParseUint(defaultValue, 10, 64); err == nil {
+				if numericValue != field.Field.Uint() {
+					return escapeIfNeeded(scope, escapeIfNeeded(scope, fmt.Sprintf("%d", field.Field.Int())))
+				} else {
+					return escapeIfNeeded(scope, defaultValue)
+				}
+			}
+		case reflect.Bool:
+			if boolValue, err := strconv.ParseBool(defaultValue); err == nil {
+				if boolValue != field.Field.Bool() {
+					return escapeIfNeeded(scope, fmt.Sprintf("%t", field.Field.Bool()))
+				} else {
+					return escapeIfNeeded(scope, defaultValue)
+				}
+			}
+		default:
+			return escapeIfNeeded(scope, defaultValue)
+		}
+	}
+	return scope.AddToVars(field.Field.Interface())
+}
+
 var DefaultCallback = &callback{processors: []*callbackProcessor{}}

callback_create.go

@@ -29,12 +29,15 @@ func Create(scope *Scope) {
 			if scope.changeableField(field) {
 				if field.IsNormal {
 					if !field.IsPrimaryKey || (field.IsPrimaryKey && !field.IsBlank) {
-						if !field.IsBlank || !field.HasDefaultValue {
+						if !field.HasDefaultValue {
 							columns = append(columns, scope.Quote(field.DBName))
 							sqls = append(sqls, scope.AddToVars(field.Field.Interface()))
-						} else if field.HasDefaultValue {
+						} else {
+							columns = append(columns, scope.Quote(field.DBName))
+							sqls = append(sqls, handleDefaultValue(scope, field))
 							scope.InstanceSet("gorm:force_reload", true)
 						}
+
 					}
 				} else if relationship := field.Relationship; relationship != nil && relationship.Kind == "belongs_to" {
 					for _, dbName := range relationship.ForeignDBNames {

callback_update.go

@@ -37,14 +37,6 @@ func UpdateTimeStampWhenUpdate(scope *Scope) {
 	}
 }
 
-func escapeIfNeeded(scope *Scope, value string) string {
-	// default:'string value' OR  sql expression, like: default:"(now() at timezone 'utc')"
-	if (strings.HasPrefix(value, "'") && strings.HasSuffix(value, "'")) || (strings.HasPrefix(value, "(") && strings.HasSuffix(value, ")")) {
-		return value
-	}
-	return scope.AddToVars(value) // default:'something'  like:default:'false' should be between quotes (what AddToVars do)
-}
-
 func Update(scope *Scope) {
 	if !scope.HasError() {
 		var sqls []string
@@ -60,12 +52,7 @@ func Update(scope *Scope) {
 			for _, field := range fields {
 				if scope.changeableField(field) && !field.IsPrimaryKey && field.IsNormal {
 					if field.HasDefaultValue {
-						if field.IsBlank {
-							defaultValue := parseTagSetting(field.Tag.Get("sql"))["DEFAULT"]
-							sqls = append(sqls, fmt.Sprintf("%v = %v", scope.Quote(field.DBName), escapeIfNeeded(scope, defaultValue)))
-						} else {
-							sqls = append(sqls, fmt.Sprintf("%v = %v", scope.Quote(field.DBName), scope.AddToVars(field.Field.Interface())))
-						}
+						sqls = append(sqls, fmt.Sprintf("%v = %v", scope.Quote(field.DBName), handleDefaultValue(scope, field)))
 						scope.InstanceSet("gorm:force_reload", true)
 					} else {
 						sqls = append(sqls, fmt.Sprintf("%v = %v", scope.Quote(field.DBName), scope.AddToVars(field.Field.Interface())))

create_test.go

@@ -157,3 +157,25 @@ func TestOmitWithCreate(t *testing.T) {
 		t.Errorf("Should not create omited relationships")
 	}
 }
+
+// Test from: https://github.com/jinzhu/gorm/issues/689
+func TestCreateWithBoolDefaultValue(t *testing.T) {
+	type Data struct {
+		ID            int    `gorm:"column:id;primary_key" json:"id"`
+		Name          string `sql:"type:varchar(100);not null;unique" json:"name"`
+		DeleteAllowed bool   `sql:"not null;DEFAULT:true" json:"delete_allowed"`
+	}
+
+	DB.AutoMigrate(&Data{})
+
+	data := Data{
+		Name:          "test",
+		DeleteAllowed: false,
+	}
+
+	DB.Create(&data)
+
+	if data.DeleteAllowed {
+		t.Error("Test failed")
+	}
+}