問題描述

一旦我將我的 Laravel 應用程序從 MySQL 移動到 pSQL.我一直收到這個錯誤.

響應內容必須是一個字符串或對象，實現了 __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 都會嘗試轉換為字符串.當您返回一個對象時，將調用該對象的 __toString() 魔術方法進行轉換.

因此，當您從控制器操作中返回 $promotion 時，Laravel 將對其調用 __toString() 以將其轉換為要顯示的字符串.

在Model上，__toString()調用toJson()，返回json_encode的結果.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，因此這可能是導致失敗的原因.您應該將 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
}

這篇關于響應內容必須是實現 __toString()、“boolean"和“boolean"的字符串或對象.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！