Add Joins support

README.md

@@ -886,6 +886,23 @@ rows, err := db.Table("orders").Select("date(created_at) as date, sum(amount) as
 for rows.Next() {
   ...
 }
+
+type Result struct {
+	Date  time.Time
+	Total int64
+}
+db.Table("orders").Select("date(created_at) as date, sum(amount) as total").Group("date(created_at)").Having("sum(amount) > ?", 100).Scan(&results)
+```
+
+## Joins
+
+```go
+rows, err := db.Table("users").Select("users.name, emails.email").Joins("left join emails on emails.user_id = users.id").Rows()
+for rows.Next() {
+  ...
+}
+
+db.Table("users").Select("users.name, emails.email").Joins("left join emails on emails.user_id = users.id").Scan(&results)
 ```
 
 ## Run Raw SQL
@@ -970,7 +987,6 @@ db.Where("email = ?", "x@example.org").Attrs(User{RegisteredIp: "111.111.111.111
 ```
 
 ## TODO
-* Scan
 * Support plugin
   BeforeQuery
   BeforeSave
@@ -998,7 +1014,6 @@ db.Where("email = ?", "x@example.org").Attrs(User{RegisteredIp: "111.111.111.111
 * Getter/Setter
   share or not? transaction?
 * Github Pages
-* Joins
 * Includes
 * AlertColumn, DropColumn, AddIndex, RemoveIndex
 

do.go

@@ -707,11 +707,11 @@ func (s *Do) havingSql() string {
 }
 
 func (s *Do) joinsSql() string {
-	return ""
+	return s.search.joinsStr + " "
 }
 
 func (s *Do) combinedSql() string {
-	return s.whereSql() + s.groupSql() + s.havingSql() + s.orderSql() + s.limitSql() + s.offsetSql()
+	return s.joinsSql() + s.whereSql() + s.groupSql() + s.havingSql() + s.orderSql() + s.limitSql() + s.offsetSql()
 }
 
 func (s *Do) createTable() *Do {

gorm_test.go

@@ -1591,6 +1591,25 @@ func TestGroup(t *testing.T) {
 	}
 }
 
+func TestJoins(t *testing.T) {
+	type result struct {
+		Name  string
+		Email string
+	}
+
+	user := User{
+		Name:   "joins",
+		Emails: []Email{{Email: "join1@example.com"}, {Email: "join2@example.com"}},
+	}
+	db.Save(&user)
+
+	var results []result
+	db.Table("users").Select("name, email").Joins("left join emails on emails.user_id = users.id").Where("name = ?", "joins").Scan(&results)
+	if len(results) != 2 || results[0].Email != "join1@example.com" || results[1].Email != "join2@example.com" {
+		t.Errorf("Should find all two emails with Join")
+	}
+}
+
 func NameIn1And2(d *DB) *DB {
 	return d.Where("name in (?)", []string{"1", "2"})
 }