Azure Resource Manager template chained functions

问题

I am trying to remove / from the URL using azure function before assigning to output variable value

"webappStorageUri":{
      "type": "string",
      "value": "[take(reference(resourceId('Microsoft.Storage/storageAccounts', variables('webappStorageName'))).primaryEndpoints.web, length(reference(resourceId('Microsoft.Storage/storageAccounts', variables('webappStorageName'))).primaryEndpoints.web)-1]"
 }

Returned value from length function should be the value for take function. This is not working. I get following error on deployment. I don't get anything out of this error message. Does Azure support chained function execution? Is this is right approach to remove / from the URL?

Error message

[error]Deployment template language expression evaluation failed: 'Unable to parse language expression 'take(reference(resourceId('Microsoft.Storage/storageAccounts', variables('webappStorageName'))).primaryEndpoints.web, length(reference(resourceId('Microsoft.Storage/storageAccounts', variables('webappStorageName'))).primaryEndpoints.web)-1': expected token 'RightParenthesis' and actual 'Integer'.'. Please see https://aka.ms/arm-template-expressions for usage details.

回答1:

I'm not sure what you are trying to achieve, but your function has issues with brackets, and you cannot really substract by appending -1 in a random place.

"[take(reference(variables('webappStorageName')).primaryEndpoints.web,
    sub(length(reference(variables('webappStorageName')).primaryEndpoints.web), 1))]"

line breaks for readability only

来源：https://stackoverflow.com/questions/60273263/azure-resource-manager-template-chained-functions