我有一个模型设置如下:
<?php namespace App'Models;
use Illuminate'Database'Eloquent'Model;
class Upload extends Model {
/**
* The database table used by the model.
*
* @var string
*/
protected $table = 'uploads';
/**
* The attributes excluded from the model's JSON form.
*
* @var array
*/
protected $hidden = array('id', 'user', 'created_at', 'updated_at');
public function mime() {
return $this->hasOne('App'Models'Mime', 'mime');
}
}
当调用JsonSerialize()时，它返回:
{
"serverPath": "upload/2015/06/06/21/filename.jpg",
"filename": "filename.jpg",
"mime": "92"
}
这个92引用另一个表(App'Models'Mime表示)中的id，并与一个字符串type相关联。我想用上述字符串替换此92。
{
"serverPath": "upload/2015/06/06/21/filename.jpg",
"filename": "filename.jpg",
"mime": "image/jpeg"
}
这怎么可能?我在Upload模型中尝试了一些protected $appends的东西，但我不确定我完全理解如何从模型内使用/访问关系。
说明表mimes包含id和type列，而表uploads包含一个名为mime的整数列，该列引用mimes
将关系命名为与表中的一个字段相同的名称并不是一个好主意。当尝试访问关系而不是访问字段时，这会导致问题(正如您所发现的)。
理想情况下，应该将mime字段重命名为mime_id。这符合Laravel的约定，是一个更准确的字段名称。
但是，如果您无法更改字段的名称，则应该更改关系的名称。
class Upload extends Model {
protected $hidden = array('id', 'user', 'created_at', 'updated_at');
public function uploadMime() {
return $this->belongsTo('App'Models'Mime', 'mime');
}
}
在上面的类中，关系名称现在是uploadMime。此外，关系从hasOne更改为belongsTo。由于上载表具有Mime表的外键，因此上载模型属于Mime模型(并且Mime模型具有one/hasMany上载模型)。
$data = 'App'Models'Upload::with('uploadMime')->findOrFail(1);
return new JsonResponse($data);
这应该会输出如下内容:
{
"serverPath": "upload/2015/06/06/21/filename.jpg",
"filename": "filename.jpg",
"mime": "92",
"uploadMime": {
"id": 92,
"type": "image/jpeg"
}
}
使用$appends和属性访问器修改JSON
如果您想更接近您在问题中提供的JSON输出，您可以创建mimeType访问器并将其添加到$appends属性:
class Upload extends Model {
// hide the mime field and uploadMime data
protected $hidden = array('id', 'user', 'created_at', 'updated_at', 'mime', 'uploadMime');
// add the mimeType attribute to the array
protected $appends = array('mimeType');
// code for $this->mimeType attribute
public function getMimeTypeAttribute($value) {
$mimeType = null;
if ($this->uploadMime) {
$mimeType = $this->uploadMime->type;
}
return $mimeType;
}
public function uploadMime() {
return $this->belongsTo('App'Models'Mime', 'mime');
}
}
这应该会输出如下内容:
{
"serverPath": "upload/2015/06/06/21/filename.jpg",
"filename": "filename.jpg",
"mimeType": "image/jpeg"
}
通过重写toArray()函数修改JSON
或者，如果你真的想让JSON使用mime键，你可以直接修改toArray()方法:
class Upload extends Model {
// hide uploadMime data, but not the mime field
protected $hidden = array('id', 'user', 'created_at', 'updated_at', 'uploadMime');
public function uploadMime() {
return $this->belongsTo('App'Models'Mime', 'mime');
}
// override the toArray function (called by toJson)
public function toArray() {
// get the original array to be displayed
$data = parent::toArray();
// change the value of the 'mime' key
if ($this->uploadMime) {
$data['mime'] = $this->uploadMime->type;
} else {
$data['mime'] = null;
}
return $data;
}
}
这应该会输出如下内容:
{
"serverPath": "upload/2015/06/06/21/filename.jpg",
"filename": "filename.jpg",
"mime": "image/jpeg"
}
好的，我相信这就是你要找的…
Upload.php(此处无修改)
<?php namespace App'Models;
use Illuminate'Database'Eloquent'Model;
class Upload extends Model {
/**
* The database table used by the model.
*
* @var string
*/
protected $table = 'uploads';
/**
* The attributes excluded from the model's JSON form.
*
* @var array
*/
protected $hidden = array('id', 'user', 'created_at', 'updated_at');
public function mime() {
return $this->hasOne('App'Models'Mime', 'mime');
}
}
然后是Mime模型
Mime.php
<?php namespace App'Models;
use Illuminate'Database'Eloquent'Model;
class Mime extends Model {
/**
* The database table used by the model.
*
* @var string
*/
protected $table = 'mimes';
}
如果你这样做，我相信你应该看到类型
routes.php
Route::get('test', function() {
$upload = 'Upload::with('mime')->first();
// return $upload //here would return it as JSON I'm pretty sure!
return $upload->mime->type;
});
查看文档获取更多关于动态加载的详细信息:http://laravel.com/docs/5.0/eloquent#eager-loading