如何在 OpenAPI-to-GraphQL 服务器中将 "where" 小句与 graphQL 一起使用？

Question

我将 LoopBack 4 与 oasgraph（重命名为 OpenAPI-to-GraphQL）一起使用。 我的 OpenAPI 端点之一有一个具有以下架构的 filter 参数：

"parameters": [
          {
            "name": "filter",
            "in": "query",
            "style": "deepObject",
            "explode": true,
            "schema": {
              "properties": {
                "where": {
                  "type": "object"
                },
                "fields": {
                  "type": "object",
                  "properties": {
                    "id": {
                      "type": "boolean"
                    },
                    "idOwner": {
                      "type": "boolean"
                    },
                    "createdTimestamp": {
                      "type": "boolean"
                    },
                    "modifiedTimestamp": {
                      "type": "boolean"
                    },
                    "idUserCreated": {
                      "type": "boolean"
                    },
                    "idUserModified": {
                      "type": "boolean"
                    },
                    "value": {
                      "type": "boolean"
                    },
                    "dicContactId": {
                      "type": "boolean"
                    },
                    "counterpartyId": {
                      "type": "boolean"
                    }
                  }
                },
                "offset": {
                  "type": "integer",
                  "minimum": 0
                },
                "limit": {
                  "type": "integer",
                  "minimum": 0
                },
                "skip": {
                  "type": "integer",
                  "minimum": 0
                },
                "order": {
                  "type": "array",
                  "items": {
                    "type": "string"
                  }
                },
                "include": {
                  "type": "array",
                  "items": {
                    "type": "object",
                    "properties": {
                      "relation": {
                        "type": "string"
                      },
                      "scope": {
                        "properties": {
                          "where": {
                            "type": "object"
                          },
                          "fields": {
                            "type": "object",
                            "properties": {}
                          },
                          "offset": {
                            "type": "integer",
                            "minimum": 0
                          },
                          "limit": {
                            "type": "integer",
                            "minimum": 0
                          },
                          "skip": {
                            "type": "integer",
                            "minimum": 0
                          },
                          "order": {
                            "type": "array",
                            "items": {
                              "type": "string"
                            }
                          }
                        }
                      }
                    }
                  }
                }
              },
              "type": "object"
            }
          }
        ],

如您所见，where 属性属于 "object" 类型。但是在 graphQL 编辑器中它需要一个 String:

graphql editor - expected type string

问题是当我 运行 查询时字符串产生错误：

graphql editor - where clause is not an object

因此，我无法使用 where 子句执行查询。

Answer 1

您可以使用 npm qs 节点模块来字符串化您的 where 子句对象。因为 Loopback 在后台使用 qs 来解析查询字符串。

import * as qs from 'qs';

let query = {
  // where condition
}

qs.stringify(query, { addQueryPrefix: true });

您可以找到有关 qs here

的更多信息

Loopback4 查询字符串问题讨论：- https://github.com/strongloop/loopback-next/issues/2468