laravel query returns weird order

问题

So I came across a bug in my 'bugoverview' page. (how ironic).. this weird way of order came to my knowledge after an bug was deleted out of the database (id : 7 was deleted)

Anyways the problem is as seen in the picture :

I get all the rows in a simple blade foreach.

my query codes are :

$bugs_all = Bug::with('klant','user')->orderBy('id','asc')->get();

and

$projects_all = Project::all();

my foreach code :

@foreach($projects_all as $project)
    @foreach($bugs_all as $bug)
        @if(count($bugs_all) > 0)
            @if($bug->project_id == $project->id)
                <tr>
                    <td>{{$bug->id}}</td>
                    <td>{{substr($bug->titel,0,15)}}...</td>
                    <td>{{$bug->status}}</td>
                    <td>{{$bug->soort}}</td>
                    <td>
                        @if($bug->prioriteit == 'laag')
                            <span class="label label-success">Laag</span>
                        @elseif($bug->prioriteit == 'gemiddeld')
                            <span class="label label-warning">Gemmideld</span>
                        @elseif($bug->prioriteit == 'hoog')
                            <span class="label label-danger">Hoog</span>
                        @elseif($bug->prioriteit == 'kritisch')
                            <span class="label label-purple">Kritisch</span>
                        @else
                            <span class="label label-info">Geen prioriteit</span>
                        @endif
                    </td>
                    <td>{{date('d-m-y - H:i',strtotime($bug->eind_datum))}}</td>
                    @if($bug->klant)
                        <td>{{$bug->klant->voornaam .' '.$bug->klant->tussenvoegsel.' '. $bug->klant->achternaam}}</td>
                    @endif
                    <td>{{$project->projectnaam}}</td>
                    @if($bug->user)
                        <td>{{$bug->user->voornaam .' '.$bug->user->tussenvoegsel.' '. $bug->user->achternaam}}</td>
                    @else
                        <td>Geen</td>
                    @endif
                    <td>
                        <a href="/bugchat/{{$bug->id}}" class="">
                            <button type="submit" class="btn btn-success btn-xs">
                                <i class="glyphicon glyphicon-search"></i>
                            </button>
                        </a>
                    </td>
                </tr>
            @endif

        @endif
    @endforeach
@endforeach

回答1:

This question contains some ambiguity, without seeing an ERD or your table/relationship structure it's hard to truely help.

However, I assume you are using InnoDB and you are not ordering your relationships correctly.

First of all InnoDB is an engine that will re-uses deleted space. For example: You create records 1, 2 and 3. Then you delete record 2 and create record 4. The default order is auto_increment in ascending order (this is not explicitly order by id ASC).

With that said the order of your bugs are as follows: 1, 4, 3 - this is simply because record 4 replaced the space of record 2 (which was previously deleted).

Secondly I would simply advise you set-up your relationships correctly. I assume your Projects are related to Bugs somehow? Something along the following lines would suffice:

// Inside your Project model.
public function bugs()
{
    return $this->hasMany('App\Bug', 'bug_id', 'id')
                ->orderBy('id', 'ASC');
}

// Inside your Bug model.
public function project()
{
    return $this->belongsTo('App\Project', 'bug_id', 'id');
}

To get all bugs for all projects:

$projects = Project::with('bug.klant', 'bug.user')->all();

Inside your blade template, you can do:

@foreach ($project->bugs as $bug)

    {{ $bug->user }}
    {{ $bug->klant }}

@endforeach

回答2:

The problem in your case ist, that you have an outer loop that walks through the different projects. As each bug is associated with a different project, your check for the project id 'destroys' the ordering of the bugs. In your code the bugs are ordered per project....

But you don't even need that outer loop. If you define a belongsTo relationship in you bugs model you could simply access the bugs like:

@foreach($bugs_all as $bug) 
   $bug->project->projectnaam;
   .... 
@endforeach

So you have all information about the bug's project and keep your defined order.

来源：https://stackoverflow.com/questions/34315840/laravel-query-returns-weird-order