创建GraphQL突变

时间:2019-03-04 22:30:10

标签: c# .net graphql github-graphql

我有以下示例突变:

mutation {
  checkoutCreate(input: {
    lineItems: [{ variantId: "Z2lkOi8vc2hvcGlmeS9Qcm9kdWN0VmFyaWFudC80", quantity: 1 }]
  }) {
    checkout {
       id
       webUrl
       lineItems(first: 5) {
         edges {
           node {
             title
             quantity
           }
         }
       }
    }
  }
}

我正在使用.net GraphQL client。我想以某种方式将lineItems列表传递给此查询。我做了以下事情:

mutation {
  checkoutCreate(input: {
    $lineItems
  }) {
    checkout {
       id
       webUrl
       lineItems(first: 5) {
         edges {
           node {
             title
             quantity
           }
         }
       }
    }
  }
}

C#代码:

    dynamic lineItems = new List<dynamic>
    {
        new
        {
            variantId = "Z2lkOi8vc2hvcGlmeS9Qcm9kdWN0VmFyaWFudC80",
            quantity = 2
        }
    };

    var request = new GraphQLRequest
    {
        Query = m_resource.Resource.GetString("CheckoutCreate"), // Gets from resource file the above string
        Variables = lineItems 
    };

    var response = await m_client.PostAsync(request);

我不断得到:

  

GraphQLHttpException:意外的HttpResponseMessage,代码为:   BadRequest

有没有办法做到这一点?还是必须在字符串中替换?

编辑:

我已经尝试过此方法(以及其他20种方法,但仍然出现错误)。我要做的就是传递LineItems列表。

mutation CreateCheckout($input: LineItemsInput!) {
  checkoutCreate(input: $input) {
    checkout {
       id
       webUrl
       lineItems(first: 5) {
         edges {
           node {
             title
             quantity
           }
         }
       }
    }
  }
}

        var request = new GraphQLRequest
        {
            Query = m_resource.Resource.GetString("CheckoutCreate"),
            Variables = new
            {
                LineItemsInput = new List<dynamic>
                    {
                        new
                        {
                            variantId = "Z2lkOi8vc2hvcGlmeS9Qcm9kdWN0VmFyaWFudC80",
                            quantity = 2
                        }
                    }
            }
        };

Json请求看起来像这样:

{
  "Query": "mutation CreateCheckout($input: LineItemsInput!) {\r\n  checkoutCreate(input: $input) {\r\n    checkout {\r\n       id\r\n       webUrl\r\n       lineItems(first: 5) {\r\n         edges {\r\n           node {\r\n             title\r\n             quantity\r\n           }\r\n         }\r\n       }\r\n    }\r\n  }\r\n}",
  "OperationName": null,
  "Variables": {
    "LineItemsInput": [
      {
        "variantId": "Z2lkOi8vc2hvcGlmeS9Qcm9kdWN0VmFyaWFudC80",
        "quantity": 2
      }
    ]
  }
}

3 个答案:

答案 0 :(得分:1)

变量是一个对象,是一个值。

使用伪代码,您拥有variables = lineItems,但您需要variables = { lineItems: lineItems }

答案 1 :(得分:1)

在查询本身中,您需要declare the variable and its type。就您而言,这看起来像

mutation CreateCheckout($lineItems: [LineItem!]!) {
  checkoutCreate(input: {
    $lineItems
  }) { ... FieldsFromTheQuestion }

操作名称(CreateCheckout)可以是任何对您有意义的名称;在架构中未指定。

@galkin的答案也可能是相关的:发出请求时,您需要在键"input"下传递行项目列表,并与查询中的变量名匹配。 raw JSON request应该看起来像

{
  "query": "mutation CreateCheckout ...",
  "variables": {
    "input": [
      {
        "variantId": "Z2lkOi8vc2hvcGlmeS9Qcm9kdWN0VmFyaWFudC80",
        "quantity" 2
      }
    ]
  }
}

答案 2 :(得分:0)

感谢@galkin和@David Maze,我这样解决了它:

mutation checkoutCreate($input: CheckoutCreateInput!) {
  checkoutCreate(input: $input) {
    checkout {
      id
    }
    checkoutUserErrors {
      code
      field
      message
    }
  }
}

c#代码:

            var request = new GraphQLRequest
            {
                Query = m_resource.Resource.GetString("CheckoutCreate"),
                Variables = new
                {
                    input = new
                    {
                        LineItems = lineItems // List<LineItem>
                    }
            };