diff --git a/database/gdb/gdb_model.go b/database/gdb/gdb_model.go
index 7ce229346..70429a339 100644
--- a/database/gdb/gdb_model.go
+++ b/database/gdb/gdb_model.go
@@ -136,9 +136,7 @@ func (c *Core) Model(tableNameQueryOrStruct ...interface{}) *Model {
 		extraArgs:  extraArgs,
 	}
 	m.whereBuilder = m.Builder()
-	// Assign the safe attribute of WhereBuilder to nil,
-	// to make it use the safe attribute of its bound model.
-	m.whereBuilder.safe = nil
+	m.whereBuilder.safe = &m.safe
 	if defaultModelSafe {
 		m.safe = true
 	}
@@ -253,8 +251,8 @@ func (m *Model) Schema(schema string) *Model {
 	return model
 }
 
-// Clone creates and returns a new model which is a clone of current model.
-// Note that it uses deep-copy for the clone.
+// Clone creates and returns a new model which is a Clone of current model.
+// Note that it uses deep-copy for the Clone.
 func (m *Model) Clone() *Model {
 	newModel := (*Model)(nil)
 	if m.tx != nil {
@@ -265,7 +263,7 @@ func (m *Model) Clone() *Model {
 	// Basic attributes copy.
 	*newModel = *m
 	// WhereBuilder copy, note the attribute pointer.
-	newModel.whereBuilder = m.whereBuilder.clone()
+	newModel.whereBuilder = m.whereBuilder.Clone()
 	newModel.whereBuilder.model = newModel
 	// Shallow copy slice attributes.
 	if n := len(m.extraArgs); n > 0 {
diff --git a/database/gdb/gdb_model_builder.go b/database/gdb/gdb_model_builder.go
index 7687da675..a271e33f5 100644
--- a/database/gdb/gdb_model_builder.go
+++ b/database/gdb/gdb_model_builder.go
@@ -48,11 +48,11 @@ func (b *WhereBuilder) getBuilder() *WhereBuilder {
 	if !isSafe {
 		return b
 	} else {
-		return b.clone()
+		return b.Clone()
 	}
 }
 
-func (b *WhereBuilder) clone() *WhereBuilder {
+func (b *WhereBuilder) Clone() *WhereBuilder {
 	newBuilder := b.model.Builder()
 	newBuilder.safe = b.safe
 	newBuilder.whereHolder = make([]WhereHolder, len(b.whereHolder))
@@ -114,3 +114,21 @@ func (b *WhereBuilder) Build() (conditionWhere string, conditionArgs []interface
 	}
 	return
 }
+
+func (b *WhereBuilder) convertWrappedBuilder(where interface{}, args []interface{}) (newWhere interface{}, newArgs []interface{}) {
+	var builder *WhereBuilder
+	switch v := where.(type) {
+	case WhereBuilder:
+		builder = &v
+	case *WhereBuilder:
+		builder = v
+	}
+	if builder != nil {
+		conditionWhere, conditionArgs := builder.Build()
+		if len(b.whereHolder) == 0 {
+			conditionWhere = "(" + conditionWhere + ")"
+		}
+		return conditionWhere, conditionArgs
+	}
+	return where, args
+}
diff --git a/database/gdb/gdb_model_builder_where.go b/database/gdb/gdb_model_builder_where.go
index 0a4e45de7..4980175c0 100644
--- a/database/gdb/gdb_model_builder_where.go
+++ b/database/gdb/gdb_model_builder_where.go
@@ -16,6 +16,8 @@ import (
 // string/map/gmap/slice/struct/*struct, etc. Note that, if it's called more than one times,
 // multiple conditions will be joined into where statement using "AND".
 func (b *WhereBuilder) doWhereType(whereType string, where interface{}, args ...interface{}) *WhereBuilder {
+	where, args = b.convertWrappedBuilder(where, args)
+
 	builder := b.getBuilder()
 	if builder.whereHolder == nil {
 		builder.whereHolder = make([]WhereHolder, 0)
@@ -59,20 +61,6 @@ func (b *WhereBuilder) doWherefType(t string, format string, args ...interface{}
 // Where("age IN(?,?)", 18, 50)
 // Where(User{ Id : 1, UserName : "john"}).
 func (b *WhereBuilder) Where(where interface{}, args ...interface{}) *WhereBuilder {
-	var builder *WhereBuilder
-	switch v := where.(type) {
-	case WhereBuilder:
-		builder = &v
-	case *WhereBuilder:
-		builder = v
-	}
-	if builder != nil {
-		conditionWhere, conditionArgs := builder.Build()
-		if len(b.whereHolder) == 0 {
-			conditionWhere = "(" + conditionWhere + ")"
-		}
-		return b.doWhereType(``, conditionWhere, conditionArgs...)
-	}
 	return b.doWhereType(``, where, args...)
 }
 
diff --git a/database/gdb/gdb_model_builder_where_prefix.go b/database/gdb/gdb_model_builder_where_prefix.go
index 7cc189901..5fbebb6a0 100644
--- a/database/gdb/gdb_model_builder_where_prefix.go
+++ b/database/gdb/gdb_model_builder_where_prefix.go
@@ -11,6 +11,8 @@ package gdb
 // WherePrefix("order", "status", "paid")                        => WHERE `order`.`status`='paid'
 // WherePrefix("order", struct{Status:"paid", "channel":"bank"}) => WHERE `order`.`status`='paid' AND `order`.`channel`='bank'
 func (b *WhereBuilder) WherePrefix(prefix string, where interface{}, args ...interface{}) *WhereBuilder {
+	where, args = b.convertWrappedBuilder(where, args)
+
 	builder := b.getBuilder()
 	if builder.whereHolder == nil {
 		builder.whereHolder = make([]WhereHolder, 0)
diff --git a/database/gdb/gdb_model_builder_whereor.go b/database/gdb/gdb_model_builder_whereor.go
index 993c4def3..ebd5157b3 100644
--- a/database/gdb/gdb_model_builder_whereor.go
+++ b/database/gdb/gdb_model_builder_whereor.go
@@ -14,6 +14,8 @@ import (
 
 // WhereOr adds "OR" condition to the where statement.
 func (b *WhereBuilder) doWhereOrType(t string, where interface{}, args ...interface{}) *WhereBuilder {
+	where, args = b.convertWrappedBuilder(where, args)
+
 	builder := b.getBuilder()
 	if builder.whereHolder == nil {
 		builder.whereHolder = make([]WhereHolder, 0)
diff --git a/database/gdb/gdb_model_builder_whereor_prefix.go b/database/gdb/gdb_model_builder_whereor_prefix.go
index c720b7c3f..102c4936a 100644
--- a/database/gdb/gdb_model_builder_whereor_prefix.go
+++ b/database/gdb/gdb_model_builder_whereor_prefix.go
@@ -11,6 +11,8 @@ package gdb
 // WhereOrPrefix("order", "status", "paid")                        => WHERE xxx OR (`order`.`status`='paid')
 // WhereOrPrefix("order", struct{Status:"paid", "channel":"bank"}) => WHERE xxx OR (`order`.`status`='paid' AND `order`.`channel`='bank')
 func (b *WhereBuilder) WhereOrPrefix(prefix string, where interface{}, args ...interface{}) *WhereBuilder {
+	where, args = b.convertWrappedBuilder(where, args)
+
 	builder := b.getBuilder()
 	builder.whereHolder = append(builder.whereHolder, WhereHolder{
 		Type:     whereHolderTypeDefault,