如何在WireMock中根据请求IDS生成JSON动态响应

问题背景 #

需要基于请求Body中的ids数组（支持单个/多个元素），动态生成result节点下对应每个id的键值对，已编写响应模板但mappings配置未生效。

原响应模板 #

{  
  "result": {    
    {{#each (jsonPath request.body '$.ids') as |id|}}
    "{{id}}": {      
      "favorite_0": 1,      
      "search_0": 1,      
      "visit_0": 1,      
      "order_0": 1,      
      "basket_0": 1,      
      "jfyimpression_0": 1    
    }{{#unless @last}},{{/unless}}
    {{/each}}  
  },  
  "messages": [    
    {      
      "type": "success",      
      "position": "top",      
      "content": "Request processed successfully.",      
      "title": "All is well!",      
      "code": "SUCCESS_1001"    
    }  
  ]
}

原无效Mappings配置 #

{
  "mappings": [
    {
      "request": {
        "method": "POST",
        "url": "/api/v1/feature-store/features",
        "bodyPatterns": [
          {
            "matchesJsonPath": "$.feature_name",
            "equalTo": "customer-product_clickstream_activities_precomputed"
          },
          {
            "matchesJsonPath": "$.identifier",
            "equalTo": "123972627"
          },
          {
            "matchesJsonPath": "$.features",
            "contains": "visit_0"
          },
          {
            "matchesJsonPath": "$.features",
            "contains": "search_0"
          },
          {
            "matchesJsonPath": "$.features",
            "contains": "favorite_0"
          },
          {
            "matchesJsonPath": "$.ids",
            "contains": "\\d{9}"
          }
        ]
      },
      "response": {
        "status": 200,
        "headers": {
          "Content-Type": "application/json"
        },
        "jsonBody": {
          "result": "{{{#each (jsonPath request.body ',$.ids') as |id index|}}  {{id}}: {\n    \"favorite_{{index}}\": 1,\n    \"search_{{index}}\": 1,\n    \"visit_{{index}}\": 1,\n    \"order_{{index}}\": 1,\n    \"basket_{{index}}\": 1,\n    \"jfyimpression_{{index}}\": 1\n  }{{#unless @last}},{{/unless}}{{/each}}}",
          "messages": [
            {
              "type": "success",
              "position": "top",
              "content": "Request processed successfully.",
              "title": "All is well!",
              "code": "SUCCESS_1001"
            }
          ]
        }
      }
    }
  ]
}

原配置问题分析 #

1. JSONPath表达式错误：',$.ids多了前置逗号，正确路径应为$.ids`
2. jsonBody使用错误：jsonBody要求值是合法JSON对象，但模板拼接的是字符串，直接赋值会导致响应格式失效
3. 键名格式不规范：id作为JSON键未用双引号包裹，生成的JSON会语法错误

正确配置方案 #

前提：启用响应模板功能 #

启动WireMock时必须添加--global-response-templating参数，否则模板语法不会被解析。

方式一：使用外部模板文件（推荐，易维护） #

1. 在WireMock的__files目录下创建dynamic-response.json，内容为你编写的响应模板（无需修改）
2. 修改Mappings配置：

{
  "mappings": [
    {
      "request": {
        "method": "POST",
        "url": "/api/v1/feature-store/features",
        "bodyPatterns": [
          {
            "matchesJsonPath": "$.feature_name",
            "equalTo": "customer-product_clickstream_activities_precomputed"
          },
          {
            "matchesJsonPath": "$.identifier",
            "equalTo": "123972627"
          },
          {
            "matchesJsonPath": "$.features",
            "contains": "visit_0"
          },
          {
            "matchesJsonPath": "$.features",
            "contains": "search_0"
          },
          {
            "matchesJsonPath": "$.features",
            "contains": "favorite_0"
          },
          {
            "matchesJsonPath": "$.ids[*]",
            "matches": "\\d{9}"
          }
        ]
      },
      "response": {
        "status": 200,
        "headers": {
          "Content-Type": "application/json"
        },
        "bodyFileName": "dynamic-response.json",
        "transformers": ["response-template"]
      }
    }
  ]
}

方式二：内联模板（直接写在Mappings中） #

如果不想使用外部文件，可将模板直接写入body字段：

{
  "mappings": [
    {
      "request": {
        "method": "POST",
        "url": "/api/v1/feature-store/features",
        "bodyPatterns": [
          {
            "matchesJsonPath": "$.feature_name",
            "equalTo": "customer-product_clickstream_activities_precomputed"
          },
          {
            "matchesJsonPath": "$.identifier",
            "equalTo": "123972627"
          },
          {
            "matchesJsonPath": "$.features",
            "contains": "visit_0"
          },
          {
            "matchesJsonPath": "$.features",
            "contains": "search_0"
          },
          {
            "matchesJsonPath": "$.features",
            "contains": "favorite_0"
          },
          {
            "matchesJsonPath": "$.ids[*]",
            "matches": "\\d{9}"
          }
        ]
      },
      "response": {
        "status": 200,
        "headers": {
          "Content-Type": "application/json"
        },
        "body": "{  \"result\": {    {{#each (jsonPath request.body '$.ids') as |id|}}\"{{id}}\": {      \"favorite_0\": 1,      \"search_0\": 1,      \"visit_0\": 1,      \"order_0\": 1,      \"basket_0\": 1,      \"jfyimpression_0\": 1    }{{#unless @last}},{{/unless}}{{/each}}  },  \"messages\": [    {      \"type\": \"success\",      \"position\": \"top\",      \"content\": \"Request processed successfully.\",      \"title\": \"All is well!\",      \"code\": \"SUCCESS_1001\"    }  ]}",
        "transformers": ["response-template"]
      }
    }
  ]
}

额外优化 #

• 请求匹配规则中，ids的校验可改为"matchesJsonPath": "$.ids[*]", "matches": "\\d{9}"，确保数组每个元素都是9位数字
• 若需根据循环索引动态生成favorite_{index}，将模板中的favorite_0改为favorite_{{@index}}即可（@index是Handlebars内置循环索引变量，从0开始）

内容的提问来源于stack exchange，提问作者Mustafa Selim Güneydın