在 Laravel 6、Lighthouse 中，debugMessage”: “Expected a value of type \”String\” but received: [\”en-US\”,\”zh-CN\”,\”sp-ES\”,\”fr-FR\”,\”de-DE\”,\”pt-PT\”,\”it-IT\”]

1、在 Laravel 6、Lighthouse 中，debugMessage”: “Expected a value of type \”String\” but received: [\”en-US\”,\”zh-CN\”,\”sp-ES\”,\”fr-FR\”,\”de-DE\”,\”pt-PT\”,\”it-IT\”]。如图1

{
  "errors": [
    {
      "debugMessage": "Expected a value of type \"String\" but received: [\"en-US\",\"zh-CN\",\"sp-ES\",\"fr-FR\",\"de-DE\",\"pt-PT\",\"it-IT\"]",
      "message": "Internal server error",
      "extensions": {
        "category": "internal"
      },
      "locations": [
        {
          "line": 34,
          "column": 9
        }
      ],
      "path": [
        "onlineStoreTheme",
        "current",
        "settings",
        31,
        "value"
      ],
      "trace": ...
    },
    {
      "debugMessage": "Cannot return null for non-nullable field \"ThemePreset.sections\".",
      "message": "Internal server error",
      "extensions": {
        "category": "internal"
      },
      "locations": [
        {
          "line": 139,
          "column": 3
        }
      ],
      "path": [
        "onlineStoreTheme",
        "current",
        "sections",
        0
      ],
      "trace": ...
    }
  ],
  "data": {
    "onlineStoreTheme": null
  }
}

2、打印 dd($resolvedData[‘current’][‘settings’][31]); ，结果如下。第 31 个元素的 value ，为数组格式。如图2

Illuminate\Support\Collection {#11225
  #items: array:33 [
    "available_languages" => array:4 [
      "id" => Modules\ThemeStore\Resolver\Id {#11223
        #prefixes: array:3 [
          0 => "theme"
          1 => "current"
          2 => "available_languages"
        ]
      }
      "settingId" => "available_languages"
      "value" => array:7 [
        0 => "en-US"
        1 => "zh-CN"
        2 => "sp-ES"
        3 => "fr-FR"
        4 => "de-DE"
        5 => "pt-PT"
        6 => "it-IT"
      ]
      "type" => "select"
    ]
  ]
}

3、编辑解析器方法，var_dump($value);，打印出值的列表

int(0)
int(0)
string(7) "#ff0000"
string(7) "#000000"
string(7) "#990000"
string(7) "#212529"
string(7) "#999999"
string(7) "#c90d0d"
string(40) "linear-gradient(90deg, #c90d0d, #c90d0d)"
string(7) "#c90d0d"
string(40) "linear-gradient(90deg, #c90d0d, #c90d0d)"
string(7) "#ffffff"
string(40) "linear-gradient(90deg, #ffffff, #ffffff)"
string(7) "#f9f1e6"
string(40) "linear-gradient(90deg, #f9f1e6, #f9f1e6)"
string(9) "Open Sans"
string(9) "Open Sans"
string(9) "Open Sans"
NULL
NULL
NULL
NULL
NULL
NULL
NULL
NULL
NULL
NULL
bool(false)
string(5) "en-US"
bool(false)
array(7) {
  [0]=>
  string(5) "en-US"
  [1]=>
  string(5) "zh-CN"
  [2]=>
  string(5) "sp-ES"
  [3]=>
  string(5) "fr-FR"
  [4]=>
  string(5) "de-DE"
  [5]=>
  string(5) "pt-PT"
  [6]=>
  string(5) "it-IT"
}
string(6) "global"

4、由于 value 的类型设置为：String，因此，需要将数组转换为 String 格式。否则会验证响应格式失败。

'value' => is_array($value) ? json_encode($value) : $value,

5、”debugMessage”: “Expected a value of type \”String\” but received: [\”en-US\”,\”zh-CN\”,\”sp-ES\”,\”fr-FR\”,\”de-DE\”,\”pt-PT\”,\”it-IT\”]”, 已经消失。符合预期。仅剩下 “debugMessage”: “Cannot return null for non-nullable field \”ThemePreset.sections\”.”。如图3

6、打印 dd($this->resolveSectionSettings($preset, $themeSettingSchema, $id));。

Illuminate\Support\Collection {#11189
  #items: array:3 [
    "header" => null
    "footer" => null
    "announcement-bar" => null
  ]
}

7、最后找到原因，在于集合中的回调函数未 return 。如图4

    private function resolveSectionSettings(ThemeSettingSet $preset, Theme $themeSettingSchema, Id $id)
    {
        $themeId = $this->viewStorage->getThemeId();

        return collect($preset->getSections())
            ->map(function(SectionSetting $sectionSetting, $sectionId) use($themeSettingSchema, $id, $themeId) {
                $sectionSchema = $themeSettingSchema->getSection($sectionId);

                $globalSectionId = $id->with($sectionId);

                return $this->resolveSectionSetting($globalSectionId, $sectionId, $themeId, $sectionSetting, $sectionSchema);
        });
    }

8、请求响应 200。如图5