Laravel 4：如何以一对多的关系检索数据？

Question

(See codes below)

I have two models User and Messages. I want to take 10 messages-with their associated sender name-based on each of the inputted conversation id and reverse the data. I have already succeeded in getting the messages but couldn't scale it down to 10 messages each conversation/with their associated sender name.

1. I have tried this to return the messages data with the users data but either I don't know how to access the sender's name or it doesn't return the associated user :

   $allMessages = Messages::with('User')->whereIn('conv_id',$conv_id);
   

2. I have also tried this to return 10 messages but it returns 10 messages based on all the messages it got instead of based on each conversation.

   $allMessages = Messages::whereIn('conv_id',$conv_id)->take(10);
   

How do I get 10 messages based on the id of each conversation together with the messages' associated sender name? Bonus points for improvement of code. Thank you in advance!

---

User model

public function messages(){
    return $this->hasMany('Messages');
}

Messages model

public function user(){
    return $this->belongsTo('User');
}

Controller

public function index()
    {
        $timestamps = Input::get('from'); //timestamp of latest message
        $conv_id = Input::get('conv_id'); //array of conversation ids
        $allMessages = Messages::whereIn('conv_id',$conv_id);
        if(is_null($timestamps)){
           $messages = $allMessages->orderBy('created_at','desc');
        }else{
           asort($timestamps);
           $messages = $allMessages->where('created_at','>',end($timestamps));
        }
        return $messages->get()->reverse();
    }

---

Migrations

Messages table

Schema::create('messages', function(Blueprint $table)
        {
            $table->increments('id');
            $table->integer('user_id');
            $table->integer('conv_id');
            $table->text('body');
            $table->timestamps();
        });

User table

Schema::create('users',function($table)
        {
            $table->increments('id');
            $table->string('email')->unique();
            $table->string('password',100);
            $table->string('name',150);
            $table->string('usertype',50);
            $table->boolean('block');
            $table->string('remember_token',100);
            $table->timestamp('lastlogin_at');
            $table->timestamps();
            $table->softDeletes();
        });

---

EDIT : var_dump preview result of WereWolf's answer in chrome

0: {id:37, user_id:1, conv_id:2, body:damn mate, created_at:2014-06-20 00:55:32,…}
1: {id:38, user_id:1, conv_id:2, body:hello, created_at:2014-06-20 02:18:21,…}
2: {id:39, user_id:1, conv_id:2, body:dude, created_at:2014-06-20 02:20:10,…}
3: {id:40, user_id:1, conv_id:2, body:test, created_at:2014-06-20 06:52:37,…}
4: {id:67, user_id:1, conv_id:2, body:haha, created_at:2014-06-21 01:25:56,…}
5: {id:68, user_id:1, conv_id:2, body:hey, created_at:2014-06-21 01:26:14, updated_at:2014-06-21 01:26:14,…}
6: {id:69, user_id:1, conv_id:1, body:testa, created_at:2014-06-21 01:27:02,…}
7: {id:70, user_id:1, conv_id:1, body:testser, created_at:2014-06-21 01:27:32,…}
8: {id:115, user_id:1, conv_id:2, body:haha, created_at:2014-06-21 02:45:06,…}
9: {id:116, user_id:1, conv_id:2, body:test, created_at:2014-06-21 02:57:03,…}

Answer 1

You may try this:

$allMessages = Messages::with('user')
                       ->where('conv_id', $conv_id)
                       ->take(10)
                       ->get();

This will return a collection of Messages model so you need to loop like:

@foreach($allMessages as $message)
    {{ $message->user->name }}
    {{ $message->body }}
@endforeach

Also, you may use:

// Get the first message and then user->name
$allMessages->first()->user->name;

// Get the second message and then user->name
$allMessages->get(1)->user->name;