Schema Functions
Schema Functions辅助函数集合

辅助函数集合

Included in the “Power Extensions” bundle

GraphQL 模式中新增的字段集合,提供与 URL、日期格式化、文本操作等相关的实用功能。

辅助字段是全局字段,因此它们会被添加到 GraphQL 模式中的每一个类型:不仅包括 QueryRoot,还包括 PostUser 等。

辅助字段列表

以下是辅助字段的列表。

_generateRandomString

生成随机字符串。

例如,执行以下 Query:

{
  _generateRandomString(
    length: 24,
    characters: "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789",
  )
}

可能会产生:

{
  "data": {
    "_generateRandomString": "BPXV1T1UJLH2S7VG3IO33FUP"
  }
}

### `_htmlParseHTML5`

使用 HTML5 解析器解析 HTML 并返回解析后的 HTML。

### `_objectConvertToNameValueEntryList`

从 JSON 对象中获取属性,创建 JSON 条目列表。

此字段用于将某个字段的 `JSONObject` 输出转换为 `[JSONObject]`,以作为另一个字段的输入。

例如,`_httpRequestHeaders`(来自 **HTTP Request via Schema** 扩展)的响应为 `StringValueJSONObject`,而传入 `_sendHTTPRequest` 的请求头为 `[HTTPRequestOptionHeaderInput!]`,每个 `HTTPRequestOptionHeaderInput` 的结构如下:

```json
{
  "name": "...",
  "value": "..."
}

因此,可以使用以下 Query 在输出与输入之间进行桥接:

{
  headers: _httpRequestHeaders
  headersInput: _objectConvertToNameValueEntryList(
    object: $__headers
  )
  _sendHTTPRequest(
    input: {
      url: "...",
      options: {
        headers: $__headersInput
      }
    }
  ) {
    # ...
  }
}

_objectSpreadIDListValueAndFlip

给定一个以 ID 为键、以 ID 列表为值的 JSON 对象,将其翻转为另一个 JSON 对象,其中列表中的每个 ID 成为键,原始键成为值。

例如,如果提供以下 JSON 对象(将文章 ID 映射到其所有翻译文章):

{
  "originPostToTranslationPostIDs": {
    "1": [3, 4, 5],
    "8": [10, 11],
    "17": [19, 20, 21]
  }
}

...应用字段 _objectSpreadIDListValueAndFlip

query SpreadAndFlipJSONObjectIDs(
  $originPostToTranslationPostIDs: JSONObject!
) {
  translationPostToOriginPostID: _objectSpreadIDListValueAndFlip(object: $originPostToTranslationPostIDs)
}

响应将变为:

{
  "translationPostToOriginPostID": {
    "3": "1",
    "4": "1",
    "5": "1",
    "10": "8",
    "11": "8",
    "19": "17",
    "20": "17",
    "21": "17"
  }
}

_strConvertMarkdownToHTML

将 Markdown 转换为 HTML。

此方法有助于生成作为某个字段或 mutation 输入的 HTML 内容。Email Sender 扩展的 mutation _sendEmail 就是一个例子,它可以发送 HTML 格式的电子邮件。

例如,以下 Query 使用 Markdown 内容生成用于发送电子邮件的 HTML:

query GetPostData($postID: ID!) {
  post(by: {id: $postID}) {
    title @export(as: "postTitle")
    excerpt @export(as: "postExcerpt")
    url @export(as: "postLink")
    author {
      name @export(as: "postAuthorName")
      url @export(as: "postAuthorLink")
    }
  }
}
 
query GetEmailData @depends(on: "GetPostData") {
  emailMessageTemplate: _strConvertMarkdownToHTML(
    text: """
 
There is a new post by [{$postAuthorName}]({$postAuthorLink}):
 
**{$postTitle}**: {$postExcerpt}
 
[Read online]({$postLink})
 
    """
  )
  emailMessage: _strReplaceMultiple(
    search: ["{$postAuthorName}", "{$postAuthorLink}", "{$postTitle}", "{$postExcerpt}", "{$postLink}"],
    replaceWith: [$postAuthorName, $postAuthorLink, $postTitle, $postExcerpt, $postLink],
    in: $__emailMessageTemplate
  )
    @export(as: "emailMessage")
  subject: _sprintf(string: "New post created by %s", values: [$postAuthorName])
    @export(as: "emailSubject")
}
 
mutation SendEmail @depends(on: "GetEmailData") {
  _sendEmail(
    input: {
      to: "target@email.com"
      subject: $emailSubject
      messageAs: {
        html: $emailMessage
      }
    }
  ) {
    status
  }
}

_strDecodeXMLAsJSON

将 XML 字符串解码为 JSON。

此方法有助于处理 XML 字符串(如 RSS 订阅源),通过将其转换为 JSON 对象,使其可由 Gato GraphQL 中的多个字段进行操作。

以下 Query:

{
  _strDecodeXMLAsJSON(xml: """<?xml version="1.0" encoding="UTF-8"?>
<bookstore>  
  <book category="COOKING">  
    <title lang="en">Everyday Italian</title>  
    <author>Giada De Laurentiis</author>  
    <year>2005</year>  
    <price>30.00</price>  
  </book>  
  <book category="CHILDREN">  
    <title lang="en">Harry Potter</title>  
    <author>J K. Rowling</author>  
    <year>2005</year>  
    <price>29.99</price>  
  </book>  
  <book category="WEB">  
    <title lang="en">Learning XML</title>  
    <author>Erik T. Ray</author>  
    <year>2003</year>  
    <price>39.95</price>  
  </book>  
</bookstore>
  """)
}

...将产生:

{
  "data": {
    "_strDecodeXMLAsJSON": {
      "bookstore": {
        "book": [
          {
            "@category": "COOKING",
            "title": {
              "@lang": "en",
              "_": "Everyday Italian"
            },
            "author": "Giada De Laurentiis",
            "year": "2005",
            "price": "30.00"
          },
          {
            "@category": "CHILDREN",
            "title": {
              "@lang": "en",
              "_": "Harry Potter"
            },
            "author": "J K. Rowling",
            "year": "2005",
            "price": "29.99"
          },
          {
            "@category": "WEB",
            "title": {
              "@lang": "en",
              "_": "Learning XML"
            },
            "author": "Erik T. Ray",
            "year": "2003",
            "price": "39.95"
          }
        ]
      }
    }
  }
}

_strParseCSV

将 CSV 字符串解析为 JSON 对象列表。

此字段以 CSV 作为输入,将其转换为可通过其他函数字段进行提取、迭代和操作的格式。

例如,以下 Query:

{
  _strParseCSV(
    string: """Year,Make,Model,Description,Price
1997,Ford,E350,"ac, abs, moon",3000.00
1999,Chevy,"Venture ""Extended Edition"" (2008)","",4900.00
1999,Chevy,"Venture ""Extended Edition, Very Large"" (2008)","",5000.00
1996,Jeep,Grand Cherokee,"MUST SELL!
air, moon roof, loaded",4799.00"""
  )
}

...将产生:

{
  "data": {
    "_strParseCSV": [
      {
        "Year": "1997",
        "Make": "Ford",
        "Model": "E350",
        "Description": "ac, abs, moon",
        "Price": "3000.00"
      },
      {
        "Year": "1999",
        "Make": "Chevy",
        "Model": "Venture \"Extended Edition\" (2008)",
        "Description": "",
        "Price": "4900.00"
      },
      {
        "Year": "1999",
        "Make": "Chevy",
        "Model": "Venture \"Extended Edition, Very Large\" (2008)",
        "Description": "",
        "Price": "5000.00"
      },
      {
        "Year": "1996",
        "Make": "Jeep",
        "Model": "Grand Cherokee",
        "Description": "MUST SELL!\nair, moon roof, loaded",
        "Price": "4799.00"
      }
    ]
  }
}

_dataMatrixOutputAsCSV

将数据输出为 CSV。

此字段接受数据矩阵并生成 CSV 字符串。该字符串随后可上传至媒体库、S3 存储桶、FileStack 等。

例如,以下 Query:

csv: _dataMatrixOutputAsCSV(
  fields: 
    ["Name", "Surname", "Year"]
  data: [
    ["John", "Smith", 2003],
    ["Pedro", "Gonzales", 2012],
    ["Manuel", "Perez", 2008],
    ["Jose", "Pereyra", 1999],
    ["Jacinto", "Bloomberg", 1998],
    ["Jun-E", "Song", 1983],
    ["Juan David", "Santamaria", 1943],
    ["Luis Miguel", null, 1966],
  ]
)

...将产生:

{
  "data": {
    "csv": "Name,Surname,Year\nJohn,Smith,2003\nPedro,Gonzales,2012\nManuel,Perez,2008\nJose,Pereyra,1999\nJacinto,Bloomberg,1998\nJun-E,Song,1983\nJuan David,Santamaria,1943\nLuis Miguel,,1966\n"
  }
}

_urlAddParams

向 URL 添加参数。

参数输入为 JSONObject参数名 => 值),允许传递多种类型的值,包括 StringInt、列表(如 [String])以及 JSONObject

以下 Query:

{
  _urlAddParams(
    url: "https://gatographql.com",
    params: {
      stringParam: "someValue",
      intParam: 5,
      stringListParam: ["value1", "value2"],
      intListParam: [8, 9, 4],
      objectParam: {
        "1st": "1stValue",
        "2nd": 2,
        "3rd": ["uno", 2.5]
        "4th": {
          nestedIn: "nestedOut"
        }
      }
    }
  )
}

...将产生:

{
  "data": {
    "_urlAddParams": "https:\/\/gatographql.com?stringParam=someValue&intParam=5&stringListParam%5B0%5D=value1&stringListParam%5B1%5D=value2&intListParam%5B0%5D=8&intListParam%5B1%5D=9&intListParam%5B2%5D=4&objectParam%5B1st%5D=1stValue&objectParam%5B2nd%5D=2&objectParam%5B3rd%5D%5B0%5D=uno&objectParam%5B3rd%5D%5B1%5D=2.5&objectParam%5B4th%5D%5BnestedIn%5D=nestedOut"
  }
}

(解码后的 URL 为 https://gatographql.com?stringParam=someValue&intParam=5&stringListParam[0]=value1&stringListParam[1]=value2&intListParam[0]=8&intListParam[1]=9&intListParam[2]=4&objectParam[1st]=1stValue&objectParam[2nd]=2&objectParam[3rd][0]=uno&objectParam[3rd][1]=2.5&objectParam[4th][nestedIn]=nestedOut。)

请注意,null 值不会被添加到 URL 中。

以下 Query:

{
  _urlAddParams(
    url: "https://gatographql.com",
    params: {
      stringParam: null,
      listParam: [1, null, 3],
      objectParam: {
        uno: null,
        dos: 2
      }
    }
  )
}

...将产生:

{
  "data": {
    "_urlAddParams": "https:\/\/gatographql.com?listParam%5B0%5D=1&listParam%5B2%5D=3&objectParam%5Bdos%5D=2"
  }
}

(解码后的 URL 为 https://gatographql.com?listParam[0]=1&listParam[2]=3&objectParam[dos]=2。)

_urlRemoveParams

从 URL 中移除参数。

以下 Query:

{
  _urlRemoveParams(
    url: "https://gatographql.com/?existingParam=existingValue&stringParam=originalValue&stringListParam[]=firstVal&stringListParam[]=secondVal&stringListParam[]=thirdVal",
    names: [
      "existingParam"
      "stringParam"
      "stringListParam"
    ]
  )
}

...将产生:

{
  "data": {
    "_urlRemoveParams": "https:\/\/gatographql.com\/"
  }
}

_arrayDeepFlatten

从包含单个值、数组和对象的混合数组中提取所有值直至最深层,并以扁平数组的形式返回。

此字段与 _arrayFlatten 类似,但它能处理混合类型并递归地展平任意深度的嵌套结构。它可以处理:

  • 单个值(字符串、数字、布尔值、null)
  • 数组(递归展平)
  • 对象(转换为数组后展平)

以下 Query:

{
  _arrayDeepFlatten(array: [
    "single string",
    ["array", "of", "strings"],
    {
      key1: "value1",
      key2: "value2"
    },
    42,
    true,
    null,
    ["nested", ["deep", "array"]],
    {
      nested: {
        inner: "value"
      }
    }
  ])
}

...将产生:

{
  "data": {
    "_arrayDeepFlatten": [
      "single string",
      "array",
      "of",
      "strings",
      "value1",
      "value2",
      42,
      true,
      null,
      "nested",
      "deep",
      "array",
      "value"
    ]
  }
}

_arrayFlatten

将数组的数组展平为单个数组。

以下 Query:

{
  _arrayFlatten(array: [
    [
      {
        "id": 2302,
        "url": "https://mysite.com/media/143"
      }
    ],
    [
      {
        "id": 2303,
        "url": "https://mysite.com/media/146"
      },
      {
        "id": 2304,
        "url": "https://mysite.com/media/147"
      },
    ]
  ])
}

...将产生:

{
  "data": {
    "_arrayFlatten": [
      {
        "id": 2302,
        "url": "https://mysite.com/media/143"
      },
      {
        "id": 2303,
        "url": "https://mysite.com/media/146"
      },
      {
        "id": 2304,
        "url": "https://mysite.com/media/147"
      }
    ]
  }
}

_arrayGenerateAllCombinationsOfItems

将数组中的元素组合,从每个数组中取出一个元素,并与对应标签下的所有其他元素合并。

以下 Query:

{
  dataCombinations: _arrayGenerateAllCombinationsOfItems(labelItems: [
    {
      label: "person",
      items: ["Sam", "Eric"]
    },
    {
      label: "location",
      items: ["Paris", "Rome"]
    },
    {
      label: "meal",
      items: ["Pasta", "Bagel"]
    }
  ])
}

...将产生:

{
  "data": {
    "dataCombinations": [
      {
        "person": "Sam",
        "location": "Paris",
        "meal": "Pasta"
      },
      {
        "person": "Sam",
        "location": "Paris",
        "meal": "Bagel"
      },
      {
        "person": "Sam",
        "location": "Rome",
        "meal": "Pasta"
      },
      {
        "person": "Sam",
        "location": "Rome",
        "meal": "Bagel"
      },
      {
        "person": "Eric",
        "location": "Paris",
        "meal": "Pasta"
      },
      {
        "person": "Eric",
        "location": "Paris",
        "meal": "Bagel"
      },
      {
        "person": "Eric",
        "location": "Rome",
        "meal": "Pasta"
      },
      {
        "person": "Eric",
        "location": "Rome",
        "meal": "Bagel"
      }
    ]
  }
}

_arrayOfJSONObjectsExtractPropertiesAndConvertToObject

给定一个 JSON 对象数组,所有对象均包含两个共同属性(如 namevalue),提取这些属性的值并创建一个 JSON 对象,以其中一个属性作为键,另一个作为值。

以下 Query:

{
  arrayToObject: _arrayOfJSONObjectsExtractPropertiesAndConvertToObject(
    array: [
      {
        label: "person",
        items: ["Sam", "Eric"]
      },
      {
        label: "location",
        items: ["Paris", "Rome"]
      },
      {
        label: "meal",
        items: ["Pasta", "Bagel"]
      }
    ],
    key: "label",
    value: "items"
  )
}

...将产生:

{
  "data": {
    "arrayToObject": {
      "person": ["Sam", "Eric"],
      "location": ["Paris", "Rome"],
      "meal": ["Pasta", "Bagel"]
    }
  }
}

_arrayOfJSONObjectsExtractProperty

给定一个 JSON 对象数组,所有对象均包含一个共同属性,提取该属性的值并将其作为数组的元素返回。

以下 Query:

{
  arrayOfProperties: _arrayOfJSONObjectsExtractProperty(
    array: [
      {
        label: "person",
        items: ["Sam", "Eric"]
      },
      {
        label: "location",
        items: ["Paris", "Rome"]
      },
      {
        label: "meal",
        items: ["Pasta", "Bagel"]
      }
    ],
    key: "label"
  )
}

...将产生:

{
  "data": {
    "arrayOfProperties": ["person", "location", "meal"]
  }
}

示例

结合 HTTP Request via SchemaField to Input 扩展,我们可以在执行 GraphQL 自定义端点或持久化 Query 时获取当前请求的 URL,添加额外参数,并向新 URL 发送另一个 HTTP 请求。

例如,在以下 Query 中,我们获取网站上的用户 ID,并将其 ID 作为参数传递执行新的 GraphQL Query:

{
  users {
    userID: id
    url: _urlAddParams(
      url: "https://somewebsite/endpoint/user-data",
      params: {
        userID: $__userID
      }
    )
    headers: _httpRequestHeaders
    headerNameValueEntryList: _objectConvertToNameValueEntryList(
      object: $__headers
    )
    _sendHTTPRequest(input: {
      url: $__url
      options: {
        headers: $__headerNameValueEntryList
      }
    }) {
      statusCode
      contentType
      body
    }
  }
}