Product Api - Check Entity Exists

[scrocquesel-ml150]

I'm trying to check that an API entity is associated with a Product entity.

resource apim 'Microsoft.ApiManagement/service@2022-08-01' existing = {
  name: 'myapim'

  resource product 'products' existing = {
    name: 'myproduct'
  }

resource productApi 'Microsoft.ApiManagement/service/products/apis@2022-08-01' existing ={
  parent: apim::product
  name: 'apiName'
}

// other resource with dependsOn productApi

At deployment time, it fails with

{
    "status": "Failed",
    "error": {
        "message": "The requested resource does not support http method 'GET'."
    }
}

Looking at the rest API, the method to check entity exists should be HEAD and not GET (https://learn.microsoft.com/en-us/rest/api/apimanagement/product-api/check-entity-exists?view=rest-apimanagement-2022-08-01&tabs=HTTP). There is no property on this entity.

Is this an issue in bicep/ARM ?

[ahelland]

Not sure what you're trying to achieve here - are you trying to build conditionals like if-then-else after initial provisioning or does this fail even before you actually have deployed anything?

Since Bicep is a compile time language some issues will only occur deploy time with no option to branch off in other directions.

[scrocquesel-ml150]

resource productApi 'Microsoft.ApiManagement/service/products/apis@2022-08-01' existing ={

Produces a read operation at deployment time, this is fine because I want it to. The issue is that the read operation is done with a GET while it should be a HEAD.

If it's not possible to generate a HEAD, then bicep should not allow to write existing on api type that do not have a GET operation. And, I guess, this can be check at compile time with the appropriate type definition.

[ahelland]

Quirky behavior to rely on http HEAD - don't see that very often.

I haven't tried running this through the debugger but it doesn't sound like Bicep as a DSL fails. Could be something in the Microsoft.ApiManagement resource provider in the Bicep Type layer. (Someone needs to maintain a translation layer backend.)

I would recommend filing an issue here to get it triaged: https://github.com/Azure/bicep-types-az