如何将数组转换为 ARM 模板中一个对象的属性? [英] How to convert an array into properties of one object in an ARM template?

问题描述

我正在寻找一种将数组(例如字符串)转换为一个对象的方法，其中的属性是从数组值生成的.

用例:我想根据资源名称列表生成一个带有资源链接的 tags 对象.我需要这样做，

I am looking for a way to convert an array (e.g. of strings) into one object, where the properties are generated from the array values.

Use case: I want to generate a tags object with links to resources, based on a list of resource names. I need to do this, to link App Service resources to an Application Insights resource.

The list of resources could be supplied using a parameter:

"parameters": {
  "appServices": {
    "type": "array",
    "metadata": {
      "description": "Names of app services to link this application insights resource to via hidden tags"
    }
  }
}

Sample input:

['appName1', 'appName2', 'appName3']

Sample output:

"tags":
{
  "[concat('hidden-link:', resourceId('Microsoft.Web/sites/', 'appName1'))]": "Resource",
  "[concat('hidden-link:', resourceId('Microsoft.Web/sites/', 'appName2'))]": "Resource",
  "[concat('hidden-link:', resourceId('Microsoft.Web/sites/', 'appName3'))]": "Resource"
}

I know you can use copy to loop over arrays but that will create an array of objects and not a single object (which is required for tags), for example:

[
{
  "[concat('hidden-link:', resourceId('Microsoft.Web/sites/', 'appName1'))]": "Resource"
},
{
  "[concat('hidden-link:', resourceId('Microsoft.Web/sites/', 'appName2'))]": "Resource"
},
{
  "[concat('hidden-link:', resourceId('Microsoft.Web/sites/', 'appName3'))]": "Resource"
}
]

It would be possible to use union to merge those objects again, but that function requires you to hardcode the objects you want to merge, so it does not work when you have an input with variable length.

What I am looking for is a way to do this in a dynamic way.

解决方案

There is no direct option to convert array to object. But here's a hack to achieve what you need. This will work for array of any length.

Steps:

1. append hidden-link text to service names
2. convert array to string
3. replace necessary symbols and make it a valid json string.
4. use json() to convert string to object

{
  "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
  "contentVersion": "1.0.0.0",
  "parameters": {
    "appServices": {
      "type": "array",
      "metadata": {
        "description": "Names of app services to link this application insights resource to via hidden tags"
      },
      "defaultValue": [ "appName1", "appName2", "appName3" ]
    }
  },
  "functions": [],
  "variables": {
    "copy": [
      {
        "name": "as",
        "count": "[length(parameters('appServices'))]",
        "input": "[concat('hidden-link:', resourceId('Microsoft.Web/sites/', parameters('appServices')[copyIndex('as')]))]"
      }
    ],
    "0": "[string(variables('as'))]",
    "1": "[replace(variables('0'), '[', '{')]",
    "2": "[replace(variables('1'), '\",', '\":\"Resource\",')]",
    "3": "[replace(variables('2'), '\"]', '\":\"Resource\"}')]"
  },
  "resources": [],
  "outputs": {
    "op1": {
      "type": "object",
      "value": "[json(variables('3'))]"
    }
  }
}

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