在Laravel5中的SQL查询中实现IF语句eloquent

Question

I want to use this query into my laravel application, but I don't know how to write the IF part!

SELECT    
`users`.* ,    
IF(`friends`.`user_id` = '2' , TRUE , FALSE) AS `user_friend`         
FROM `users`    
LEFT JOIN `friends` ON `friends`.`friend_id` = `users`.`id`  AND `friends`.`user_id` = '2'    
WHERE `users`.`id` != '2'

Answer 1

You can use DB::raw.

User::select(DB::raw('users.* , IF(friends.user_id = '2' , TRUE , FALSE) AS user_friend'))
->join('friends', 'friends.friend_id', '=', 'user.user_id')
->where('friends.user_id, 2)
->where('user.id', '!=', 2);

Updated:

You can have a look at Advanced Join Clauses

->join('friends', function ($join) {
        $join->on('friends', 'friends.friend_id', '=', 'user.user_id')
             ->where('friends.user_id', 2);


    })