問題描述
一旦我將我的 Laravel 應(yīng)用程序從 MySQL 移動到 pSQL.我一直收到這個錯誤.
<塊引用>響應(yīng)內(nèi)容必須是一個字符串或?qū)ο螅瑢崿F(xiàn)了 __toString()，給出了boolean".
我有一個 API 可以返回我的促銷
__對此的任何提示/建議都將是一個巨大的幫助！
TL;DR
僅返回 response()->json($promotion) 并不能解決此問題中的問題.$promotion 是一個 Eloquent 對象，Laravel 會自動為響應(yīng)進行 json_encode.json 編碼失敗，因為 img 屬性是 PHP 流資源，無法編碼.
詳情
無論你從控制器返回什么，Laravel 都會嘗試轉(zhuǎn)換為字符串.當(dāng)您返回一個對象時，將調(diào)用該對象的 __toString() 魔術(shù)方法進行轉(zhuǎn)換.
因此，當(dāng)您從控制器操作中返回 $promotion 時，Laravel 將對其調(diào)用 __toString() 以將其轉(zhuǎn)換為要顯示的字符串.
在Model上，__toString()調(diào)用toJson()，返回json_encode的結(jié)果.因此，json_encode 返回 false，這意味著它遇到了錯誤.
您的 dd 表明您的 img 屬性是一個 stream 資源.json_encode 無法對 resource 進行編碼，因此這可能是導(dǎo)致失敗的原因.您應(yīng)該將 img 屬性添加到 $hidden 屬性以將其從 json_encode 中刪除.
class Promotion 擴展模型{受保護的 $hidden = ['img'];//其余課程}As soon as I move my Laravel App from MySQL to pSQL. I kept getting this error.
The Response content must be a string or object implementing __toString(), "boolean" given.
I have an API that suppose to return my promotion
http://localhost:8888/api/promotion/1
public function id($id){
$promotion = Promotion::find($id);
dd($promotion); //I got something here
return $promotion;
}
It used to return my promotion, now it return an error.
dd($promotion);
I got
Promotion {#410 ▼
#table: "promotions"
#connection: null
#primaryKey: "id"
#perPage: 15
+incrementing: true
+timestamps: true
#attributes: array:16 [▼
"id" => 1
"cpe_mac" => "000D6721A5EE"
"name" => "qwrqwer"
"type" => "img_path"
"status" => "Active"
"heading_text" => "qwerq"
"body_text" => "werqwerqw"
"img" => stream resource @244 ?}
"img_path" => "/images/promotion/1/promotion.png"
"video_url" => ""
"video_path" => ""
"account_id" => 1001
"img_url" => ""
"footer_text" => "qwerqwerre"
"created_at" => "2016-08-04 10:53:57"
"updated_at" => "2016-08-04 10:53:59"
]
#original: array:16 [?]
#relations: []
#hidden: []
#visible: []
#appends: []
#fillable: []
#guarded: array:1 [?]
#dates: []
#dateFormat: null
#casts: []
#touches: []
#observables: []
#with: []
#morphClass: null
+exists: true
+wasRecentlyCreated: false
}
Content
__ Any hints / suggestions on this will be a huge help!
TL;DR
Just returning response()->json($promotion) won't solve the issue in this question. $promotion is an Eloquent object, which Laravel will automatically json_encode for the response. The json encoding is failing because of the img property, which is a PHP stream resource, and cannot be encoded.
Details
Whatever you return from your controller, Laravel is going to attempt to convert to a string. When you return an object, the object's __toString() magic method will be invoked to make the conversion.
Therefore, when you just return $promotion from your controller action, Laravel is going to call __toString() on it to convert it to a string to display.
On the Model, __toString() calls toJson(), which returns the result of json_encode. Therefore, json_encode is returning false, meaning it is running into an error.
Your dd shows that your img attribute is a stream resource. json_encode cannot encode a resource, so this is probably causing the failure. You should add your img attribute to the $hidden property to remove it from the json_encode.
class Promotion extends Model
{
protected $hidden = ['img'];
// rest of class
}
這篇關(guān)于響應(yīng)內(nèi)容必須是實現(xiàn) __toString()、“boolean"和“boolean"的字符串或?qū)ο?移動到 psql 后給出的文章就介紹到這了，希望我們推薦的答案對大家有所幫助，也希望大家多多支持html5模板網(wǎng)！