From 8fd8604a70a4503d5e2a4f35bf93810749e92917 Mon Sep 17 00:00:00 2001
From: Jinzhu <wosmvp@gmail.com>
Date: Sat, 16 Nov 2013 22:42:00 +0800
Subject: [PATCH] Support use variable to keep query chain

---
 README.md    |  6 ++++++
 gorm_test.go | 11 +++++++----
 2 files changed, 13 insertions(+), 4 deletions(-)

diff --git a/README.md b/README.md
index d87b5715..27a5f3e0 100644
--- a/README.md
+++ b/README.md
@@ -710,6 +710,12 @@ db.Where("created_at > ?", "2013-10-10").Find(&cancelled_orders, "state = ?", "c
 //// SELECT * FROM orders WHERE created_at > '2013/10/10' AND state = 'shipped'; (shipped_orders)
 
 
+// Use variable to keep query chain
+todays_orders := db.Where("created_at > ?", "2013-10-29")
+cancelled_orders := todays_orders.Where("state = ?", "cancelled")
+shipped_orders := todays_orders.Where("state = ?", "shipped")
+
+
 // Search with shared conditions from different tables
 db.Where("product_name = ?", "fancy_product").Find(&orders).Find(&shopping_carts)
 //// SELECT * FROM orders WHERE product_name = 'fancy_product'; (orders)
diff --git a/gorm_test.go b/gorm_test.go
index db0e2fd7..38ec2b54 100644
--- a/gorm_test.go
+++ b/gorm_test.go
@@ -1354,11 +1354,14 @@ func TestTransaction(t *testing.T) {
 	}
 }
 
-func (s *CreditCard) BeforeSave() (err error) {
-	if s.Number == "0000" {
-		err = errors.New("invalid credit card")
+func TestQueryChain(t *testing.T) {
+	var user_count1, user_count2 int64
+	d := db.Model(User{}).Where("age > ?", 20)
+	d.Where("name = ?", "3").Count(&user_count1)
+	d.Count(&user_count2)
+	if user_count2 == user_count1 {
+		t.Error("DB object should be cloned when search")
 	}
-	return
 }
 
 func BenchmarkGorm(b *testing.B) {