无法显示Laravel 5.2中多对多关系的元素

Question

im trying to query data from a Many to Many relationship in Laravel 5.2 But when I want to retrieve the data im getting blank information. I have some doubts because the data I received only detect quick_tags but theres is no data in there and it should be quickTags.

I'm doing this in my controller

<?php

namespace Knotion\Http\Controllers;

use Illuminate\Http\Request;
use Knotion\Http\Requests;
use Knotion\Http\Requests\ResourcesRequest;

use Knotion\CTL_Resource;
use Knotion\CTL_Tag;
use Knotion\CTL_QuickTag;
use Knotion\CTL_RelatedTo;
use Knotion\CTL_ResourceType;


class ResourcesController extends Controller  {

    public function index(Request $request)    {

        $resources = CTL_Resource::paginate(10);



        $resources->each(function($resources) {
          $resources->tags;
          $resources->quickTags;
          $resources->relatedTo;

        });

        return response()->json(
          $resources->toArray()
      );
    }

and I have this code in my Model

<?php

namespace Knotion;

use Illuminate\Database\Eloquent\Model;

class CTL_Resource extends Model  {
    public $timestamps = false;

    protected $table = "CTL_Resource";
    protected $primaryKey = "idResource";

    protected $hidden = [
      'coachVisibility', 'thumbnail', 'tags', 'relatedTo',
      'studentVisibility', 'isHTML','studentIndex', 'coachIndex',
      'isURL', 'source', 'path', 'status', 'updateTime', 'isfolder',
      'parentResource', 'idModifierUser'
    ];

    protected $fillable = ['idResourceType','productionKey', 'tags', 'idCreatorUser', 'idModifierUser', 'idCreationCountry', 'title', 'description', 'URL', 'fileName', 'extension', 'minimumAge', 'maximumAge', 'productionKey'];

    public function creatorUser() {
      return $this->belongsTo('Knotion\OPR_User', 'idCreatorUser');
    }
    public function creationCountry() {
      return $this->belongsTo('Knotion\CTL_Country', 'idCreationCountry');
    }
    public function resourceType()  {
      return $this->belongsTo('Knotion\CTL_ResourceType', 'idResourceType');
    }
    public function quickTags() {
      return $this->belongsToMany('Knotion\CTL_QuickTag', 'CTL_Resource_has_QuickTags', 'idResource','idQuickTag');
    }
    public function tags() {
      return $this->belongsToMany('Knotion\CTL_Tag','CTL_Resource_has_Tags', 'idResource', 'idTag');
    }
    public function relatedTo() {
      return $this->belongsToMany('Knotion\CTL_RelatedTo', 'CTL_Resource_has_RelatedTo', 'idResource', 'idRelatedTo');
    }

}

This is the result. As you see there is quick_tags and its empty

{
  "total": 2,
  "per_page": 10,
  "current_page": 1,
  "last_page": 1,
  "next_page_url": null,
  "prev_page_url": null,
  "from": 1,
  "to": 2,
  "data": [
    {
      "idResource": 0,
      "idResourceType": "49ee39d6-eecd-11e5-b044-4914876a7f3d",
      "idCreatorUser": "04664624-eecd-11e5-b044-4914876a7f3d",
      "idCreationCountry": "b4afa9ae-eecc-11e5-b044-4914876a7f3d",
      "productionKey": "1234567890",
      "title": "ElTitle1",
      "description": "ElDescription1",
      "minimumAge": "5",
      "maximumAge": "10",
      "fileName": "ElFileName1",
      "extension": ".png",
      "URL": "ElURL1",
      "createTime": "2016-03-28 14:07:21",
      "quick_tags": []
    },
    {
      "idResource": 0,
      "idResourceType": "49ee39d6-eecd-11e5-b044-4914876a7f3d",
      "idCreatorUser": "04664624-eecd-11e5-b044-4914876a7f3d",
      "idCreationCountry": "b4afa9ae-eecc-11e5-b044-4914876a7f3d",
      "productionKey": "0987654321",
      "title": "ElTitle2",
      "description": "ElDescription2",
      "minimumAge": "5",
      "maximumAge": "10",
      "fileName": "ElFileName2",
      "extension": ".png",
      "URL": "ElURL2",
      "createTime": "2016-03-28 14:44:37",
      "quick_tags": []
    }
  ]
}

I don't know if its necessary but this is the sql code of the relationship. I just posting this one but others are very similar

DROP TABLE IF EXISTS `CTL_Resource_has_QuickTags`;
CREATE TABLE `CTL_Resource_has_QuickTags` (
  `idResource` varchar(40) NOT NULL COMMENT 'Foreign key to the CTL_Resource table ',
  `idQuickTag` varchar(40) NOT NULL COMMENT 'foreign key to the CTL_QuickTags table.',
  PRIMARY KEY (`idResource`,`idQuickTag`),
  KEY `fk_CTL_Resource_has_QuickTag_QuickTag1_idx` (`idQuickTag`),
  KEY `fk_CTL_Resource_has_QuickTag_CTL_Resource1_idx` (`idResource`),
  CONSTRAINT `fk_CTL_Resource_has_QuickTag_CTL_Resource1_idx` FOREIGN KEY (`idResource`) REFERENCES `CTL_Resource` (`idResource`) ON DELETE NO ACTION ON UPDATE NO ACTION,
  CONSTRAINT `fk_CTL_Resource_has_QuickTag_QuickTag1_idx` FOREIGN KEY (`idQuickTag`) REFERENCES `CTL_QuickTags` (`idQuickTag`) ON DELETE NO ACTION ON UPDATE NO ACTION
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COMMENT='this table establishes the amount of quicktags that a given tag';

Answer 1

Considering your idResource is displaying as 0, as well as some similar fields look like GUIDs and your foreign key fields are defined as varchar(40), I'm going to assume that your CTL_Resource.idResource field is also defined as varchar(40).

In this case, when the $primaryKey field is not an auto-incrementing integer, you need to tell the Model that. You do this by setting the $incrementing property on the Model:

public $incrementing = false;

Additionally, in relation to your quick_tags vs quickTags question, that has to do with the $snakeAttributes property on your Model. When set to true (which is default), your model will snake_case the keys of your relationship objects when converting to json (toJson()) or an array (toArray()). If you want to turn this off, you need to set the $snakeAttributes property on the Model:

public static $snakeAttributes = false;

So, your Model should end up looking something like:

class CTL_Resource extends Model  {

    // set the table name since it is not ctl_resources
    protected $table = "CTL_Resource";

    // set the primary key field since it is not id
    protected $primaryKey = "idResource";

    // primary key is not an auto-incrementing int
    public $incrementing = false;

    // no created_at, updated_at fields on this table
    public $timestamps = false;

    // don't snake case the relationship names on json/array conversion
    public static $snakeAttributes = false;

    // code ...
}