我没有太多的运气来解决这个问题.所以我提出两个问题.
考虑到我有一辆车,而且这辆车可以有很多功能,但功能也是由功能类型分隔的,我如何返回所有功能,分隔功能类型,用于上述汽车?
我有四个表,其中列表和功能是透视表:
- 房源(id)
- list _功能( list _id,功能_id)
- list _功能_类型(id、类型)
- list _功能_值(id、 list _功能_类型_id、值)
我有下面的代码,它产生了我需要的东西,但是当我使用它时,我得到了一个Laravel错误..."调用字符串上的成员函数AddagerConstraints()"...因为我这样调用它:
Listing::with(
'features',
)->get();
我用来以我想要的格式生成数据的代码是
public function features()
{
$out = array();
$features = $this->hasMany('App\Models\ListingFeature', 'listing_id', 'id')->select('feature_id')->get();
$types = ListingFeatureType::all();
foreach($types as $key => $obj){
$out[$key]['listing_feature_type_id'] = $obj->id;
$out[$key]['name'] = $obj->listing_feature_type;
$out[$key]['features'] = ListingFeatureValue::whereIn('id', $features->toArray())->where('listing_feature_type_id', '=', $obj->id)->get()->toArray();
}
return json_encode($out);
}
返回:
[
{
"listing_feature_type_id": "0f40888c-3b09-40ed-aef6-0fddc1a155b6",
"name": "Safety",
"features": [
{
"id": "0ed0ad63-a6ed-4818-8c6f-ee048694dcd9",
"listing_feature_type_id": "0f40888c-3b09-40ed-aef6-0fddc1a155b6",
"listing_feature_text": "Anti-Lock Brakes"
},
{
"id": "37abeef2-dc22-4995-8503-f89962242ea6",
"listing_feature_type_id": "0f40888c-3b09-40ed-aef6-0fddc1a155b6",
"listing_feature_text": "Collision Detection"
},
{
"id": "3c0728e1-91f7-4f44-ac0b-429eda816692",
"listing_feature_type_id": "0f40888c-3b09-40ed-aef6-0fddc1a155b6",
"listing_feature_text": "Dual Airbags"
},
{
"id": "4255b8b4-e71c-4059-8a22-1b9894512564",
"listing_feature_type_id": "0f40888c-3b09-40ed-aef6-0fddc1a155b6",
"listing_feature_text": "Side Airbags"
}
]
},
{
"listing_feature_type_id": "84dcce5c-34b9-4c8b-9066-5b20a42cf4cd",
"name": "Interior",
"features": [
{
"id": "1b89581e-1a30-4dce-9455-ab0ad4c49bcf",
"listing_feature_type_id": "84dcce5c-34b9-4c8b-9066-5b20a42cf4cd",
"listing_feature_text": "Privacy Glass"
},
{
"id": "59e3628f-3cef-4447-9cb2-71be4a3046a4",
"listing_feature_type_id": "84dcce5c-34b9-4c8b-9066-5b20a42cf4cd",
"listing_feature_text": "Onboard GPS"
},
{
"id": "66fe416b-98dc-45c8-979d-78f2ea7fe876",
"listing_feature_type_id": "84dcce5c-34b9-4c8b-9066-5b20a42cf4cd",
"listing_feature_text": "In-dash Navigation"
},
{
"id": "8fe836a3-5596-4306-aac1-bae4cb596e20",
"listing_feature_type_id": "84dcce5c-34b9-4c8b-9066-5b20a42cf4cd",
"listing_feature_text": "Power Windows"
},
{
"id": "e4addb5a-1b26-4ae3-b0ee-3b8bce892fb9",
"listing_feature_type_id": "84dcce5c-34b9-4c8b-9066-5b20a42cf4cd",
"listing_feature_text": "Tinted Windows"
},
{
"id": "f95b8253-a2b8-4bfc-90c0-0fc656c3f200",
"listing_feature_type_id": "84dcce5c-34b9-4c8b-9066-5b20a42cf4cd",
"listing_feature_text": "CD Player"
}
]
},
{
"listing_feature_type_id": "8d16e8ea-3d38-48dc-8e56-00d1cc736f0d",
"name": "Exterior",
"features": [
{
"id": "3aa6dd05-dd3a-4e93-ad06-295687a8dda1",
"listing_feature_type_id": "8d16e8ea-3d38-48dc-8e56-00d1cc736f0d",
"listing_feature_text": "Spoiler"
}
]
}
]
以下是模型(非常基本,刚刚开始):
<?php
namespace App\Models;
use Illuminate\Database\Eloquent\Model;
class ListingFeatureValue extends Model
{
protected $table = 'listings_features_values';
public $timestamps = false;
public $incrementing = false;
public function type() {
return $this->belongsTo('App\Models\ListingFeatureType', 'listing_feature_type_id', 'id');
}
}
<?php
namespace App\Models;
use Illuminate\Database\Eloquent\Model;
class ListingFeatureType extends Model
{
protected $table = 'listings_features_types';
public $timestamps = false;
public $incrementing = false;
public function values() {
return $this->hasMany('App\Models\ListingFeatureValue', 'listing_feature_type_id', 'id');
}
}
<?php
namespace App\Models;
use Illuminate\Database\Eloquent\Model;
class ListingFeature extends Model
{
protected $table = 'listings_features';
public $timestamps = false;
public $incrementing = false;
}
我如何创建Laravel模型关系,以实现相同的结果集,但如上所述调用它?或者,我怎样才能像上面那样调用它,但阻止错误发生?
如果你能做到这一点,谢谢!
Update:
我无法让它按原样工作,我遇到了一个SQL错误,这让我觉得我需要一个belongToManyThrough,以便指定表名:
SQLSTATE[42S02]: Base table or view not found: 1146 Table 'ad_l5.listing_listing_feature' doesn't exist (SQL: select `listings_features`.*, `listing_listing_feature`.`listing_id` as `pivot_listing_id`, `listing_listing_feature`.`listing_feature_id` as `pivot_listing_feature_id` from `listings_features` inner join `listing_listing_feature` on `listings_features`.`id` = `listing_listing_feature`.`listing_feature_id` where `listing_listing_feature`.`listing_id` in (b266c874-1cef-4f49-b65f-f91ddaaf6aee, e93674ca-3f82-45d8-9961-e8569cac164b))
但是使用@Carter Fort发布的答案,并将features()方法更改为
return $this->belongsToMany(ListingFeatureValue::class, 'listings_features', 'listing_id', 'feature_id');
还将添加到模型列表FeatureValue
public function type()
{
return $this->belongsTo(ListingFeatureType::class, 'listing_feature_type_id', 'id');
}
我得到以下结果:
"featuresByType": {
"": [
{
"id": "3aa6dd05-dd3a-4e93-ad06-295687a8dda1",
"listing_feature_type_id": "8d16e8ea-3d38-48dc-8e56-00d1cc736f0d",
"listing_feature_text": "Spoiler",
"pivot": {
"listing_id": "e93674ca-3f82-45d8-9961-e8569cac164b",
"feature_id": "3aa6dd05-dd3a-4e93-ad06-295687a8dda1"
},
"type": {
"id": "8d16e8ea-3d38-48dc-8e56-00d1cc736f0d",
"listing_feature_type": "Exterior"
}
},
{
"id": "f95b8253-a2b8-4bfc-90c0-0fc656c3f200",
"listing_feature_type_id": "84dcce5c-34b9-4c8b-9066-5b20a42cf4cd",
"listing_feature_text": "CD Player",
"pivot": {
"listing_id": "e93674ca-3f82-45d8-9961-e8569cac164b",
"feature_id": "f95b8253-a2b8-4bfc-90c0-0fc656c3f200"
},
"type": {
"id": "84dcce5c-34b9-4c8b-9066-5b20a42cf4cd",
"listing_feature_type": "Interior"
}
},
{
"id": "66fe416b-98dc-45c8-979d-78f2ea7fe876",
"listing_feature_type_id": "84dcce5c-34b9-4c8b-9066-5b20a42cf4cd",
"listing_feature_text": "In-dash Navigation",
"pivot": {
"listing_id": "e93674ca-3f82-45d8-9961-e8569cac164b",
"feature_id": "66fe416b-98dc-45c8-979d-78f2ea7fe876"
},
"type": {
"id": "84dcce5c-34b9-4c8b-9066-5b20a42cf4cd",
"listing_feature_type": "Interior"
}
},
{
"id": "0ed0ad63-a6ed-4818-8c6f-ee048694dcd9",
"listing_feature_type_id": "0f40888c-3b09-40ed-aef6-0fddc1a155b6",
"listing_feature_text": "Anti-Lock Brakes",
"pivot": {
"listing_id": "e93674ca-3f82-45d8-9961-e8569cac164b",
"feature_id": "0ed0ad63-a6ed-4818-8c6f-ee048694dcd9"
},
"type": {
"id": "0f40888c-3b09-40ed-aef6-0fddc1a155b6",
"listing_feature_type": "Safety"
}
},
...
这比我当时做的要好,但如果结果是按类型分组,然后按其中的特征分组,而不是按每个特征附加类型分组,那就更好了.使解析以便显示变得更加困难.谢谢你迄今为止的帮助!
Update 2
这些将是我的模式文件:
// listings
Schema::create('listings', function (Blueprint $table) {
$table->string('id');
$table->string('title');
});
// listings to features pivot
Schema::create('listings_features', function (Blueprint $table) {
$table->string('listing_id');
$table->string('feature_id');
});
// feature types (i.e. Safety)
Schema::create('listings_features_types', function(Blueprint $table){
$table->string('id');
$table->string('listing_feature_type');
});
// feature values (i.e. Anti-Lock Brakes)
Schema::create('listings_features_values', function(Blueprint $table){
$table->string('id');
$table->string('listing_feature_type_id'); // links to listings_features_types
$table->string('listing_feature_text');
});
Update 3
"features": [
{
"id": "3aa6dd05-dd3a-4e93-ad06-295687a8dda1",
"listing_feature_type_id": "8d16e8ea-3d38-48dc-8e56-00d1cc736f0d",
"listing_feature_text": "Spoiler",
"pivot": {
"listing_id": "e93674ca-3f82-45d8-9961-e8569cac164b",
"feature_id": "3aa6dd05-dd3a-4e93-ad06-295687a8dda1"
},
"type": {
"id": "8d16e8ea-3d38-48dc-8e56-00d1cc736f0d",
"listing_feature_type": "Exterior"
}
},
{
"id": "f95b8253-a2b8-4bfc-90c0-0fc656c3f200",
"listing_feature_type_id": "84dcce5c-34b9-4c8b-9066-5b20a42cf4cd",
"listing_feature_text": "CD Player",
"pivot": {
"listing_id": "e93674ca-3f82-45d8-9961-e8569cac164b",
"feature_id": "f95b8253-a2b8-4bfc-90c0-0fc656c3f200"
},
"type": {
"id": "84dcce5c-34b9-4c8b-9066-5b20a42cf4cd",
"listing_feature_type": "Interior"
}
},
{
"id": "66fe416b-98dc-45c8-979d-78f2ea7fe876",
"listing_feature_type_id": "84dcce5c-34b9-4c8b-9066-5b20a42cf4cd",
"listing_feature_text": "In-dash Navigation",
"pivot": {
"listing_id": "e93674ca-3f82-45d8-9961-e8569cac164b",
"feature_id": "66fe416b-98dc-45c8-979d-78f2ea7fe876"
},
"type": {
"id": "84dcce5c-34b9-4c8b-9066-5b20a42cf4cd",
"listing_feature_type": "Interior"
}
// ....
我想要的是:
{
"feature_types":[
{
"type":{
"id":"8d16e8ea-3d38-48dc-8e56-00d1cc736f0d",
"listing_feature_type":"Interior",
"features":[
{
"id":"3aa6dd05-dd3a-4e93-ad06-295687a8dda1",
"listing_feature_type_id":"8d16e8ea-3d38-48dc-8e56-00d1cc736f0d",
"listing_feature_text":"GPS"
},
{
"id":"66fe416b-98dc-45c8-979d-78f2ea7fe876",
"listing_feature_type_id":"84dcce5c-34b9-4c8b-9066-5b20a42cf4cd",
"listing_feature_text":"In-dash Navigation"
},
] "pivot":{
"listing_id":"e93674ca-3f82-45d8-9961-e8569cac164b",
"feature_id":"f95b8253-a2b8-4bfc-90c0-0fc656c3f200"
}
}
}
]
}