How to prevent insert email if already exist with specific id in laravel?

问题

I have table in which i'm trying to store email addresses. These email addresses will be save with user_id.

For example in email_list table

|ID | user_id | email          |
...............................
| 1 | 101     | john@gmail.com |
...............................
| 2 | 102     | john@gmail.com |

In above table you can see same email addresses save with different user_id, that's it what i'm trying to do.

Currently i'm trying simple laravel validation like this.

'email' => 'required|unique:email_list|email',

So is there any way to check already exist email addresses if row has same user_id? I'm using laravel 5.2. I would like to appreciate if someone guide me. Thank you

Edited After 3 Hours

I also add same question in the github as issue. A person is saying that i have to create own validation rule.

回答1:

Forcing A Unique Rule To Ignore A Given ID

You can specify an ID to be ignored as the optional third parameter. Furthermore, if your table uses a primary key column name other than id, you may specify it as the optional fourth parameter

'email' => "unique:{$table},{$field},{$user->id},{$idField}"

So in your case, it'd be as follows

'email' => "unique:email_list,email,{$user->id},user_id'

回答2:

It is against of exist rule.
First of all, the exist rule check based on the condition the fields is avail or not.
I think, if we used it as opposite then it is useful for you.

Ex:-

     'email' => 'exists:email_list,email,user_id,!102'

i.e.,

     'email' => 'exists:email_list,email,user_id,!'. $user_id        

otherwise,

     'email' => 'exists:email_list,email,user_id,!'. Input::get(user_id)

while using Input & import the

    use Illuminate\Support\Facades\Input;        

and change message content
Please try these and reply what happened.. or is it work for you..?

来源：https://stackoverflow.com/questions/39591620/how-to-prevent-insert-email-if-already-exist-with-specific-id-in-laravel