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Rajesh
Advocate II
Advocate II

Custom connector - Adding sample response data throws error Unable to convert array of different types into schema

Hi

 

I'm consuming a cost management API from Azure through a custom connector.  

https://management.azure.com/{scope}/providers/Microsoft.CostManagement/query?api-version=2019-11-01

 

The sample response from the above API is as shown below

{
  "id": "subscriptions/232a4132-b936-1212-8967-2aba520a753d/resourcegroups/rg-demo/providers/Microsoft.CostManagement/query/f528025f-6f3a-4ec2-92c8-aa2ede1c5401",
  "name": "f528025f-6f3a-4ec2-92c8-aa2ede1c5401",
  "type": "Microsoft.CostManagement/query",
  "properties": {
    "nextLink": null,
    "columns": [
      {
        "name": "PreTaxCost",
        "type": "Number"
      },
      {
        "name": "ResourceGroup",
        "type": "String"
      },
      {
        "name": "Currency",
        "type": "String"
      }
    ],
    "rows": [
      [
        5.874761431565889,
        "rg-demo",
        "GBP"
      ]
    ]
  }
}

 In the custom connector definition step, I've added an action and in the Response section, when I'm trying to add a default response and import the above sample response data, it is throwing an error that "Unable to convert array of different types into schema". I think it is caused by the rows section in the above response. Any idea how this can be fixed?

 

What I noticed is that if I don't specify a sample response, connector simply returns 200 ok response and within PowerApps I don't get the result set back as shown in sample response. That's why I'm trying to add default response hoping I would be able to display the actual resultset within PowerApp. Is there any other way to return the data from connector than just a 200 response?

 

Thanks

7 REPLIES 7
v-xida-msft
Community Support
Community Support

Hi @Rajesh ,

Based on the issue that you mentioned, I have made a test, and the issue is confirmed on my side. I agree with your thought almost, I think this issue is related to the "rows" section in your Response Body JSON Schema.

 

Actually, it is an known issue within custom connector in PowerApps. The Reponse Body JSON Schema for a custom connector action is required to provide a valid JSON Object value. If you want to specify an array value for a key in your JSON schema, you should provide JSON Object Array value as below:

{
 "Key": [
         {
           "Column1": "xxx",
           "Column2": "xxxx"
         }
    ]
}

rather than a primitive array value as beow:

{
 "Key": [
         "Value1",
         "Value2"
    ]
}

In addition, the nested Array type is not supported within the Response Body JSON Schema of a custom connector action. If you would specify a nested Array type for a key in your Response Body JSON Schema of a custom connector action, I afraid that there is no way to achieve your needs.

 

As an fixed solution, please remove the "rows" section from the Response Body JSON Schema of your custom connector action. Type the following JSON Object within the Response Body JSON Schema of your custom connector action:

{
  "id": "subscriptions/232a4132-b936-1212-8967-2aba520a753d/resourcegroups/rg-demo/providers/Microsoft.CostManagement/query/f528025f-6f3a-4ec2-92c8-aa2ede1c5401",
  "name": "f528025f-6f3a-4ec2-92c8-aa2ede1c5401",
  "type": "Microsoft.CostManagement/query",
  "properties": {
    "nextLink": null,
    "columns": [
      {
        "name": "PreTaxCost",
        "type": "Number"
      },
      {
        "name": "ResourceGroup",
        "type": "String"
      },
      {
        "name": "Currency",
        "type": "String"
      }
    ]
  }
}

 

If you still want to include the "rows" section in the Response Body JSON Schema, you need to modify your cost management API, to make the "rows" section contain a JSON Object Array or JSON Object in this action response. After that, you could include the “rows” section in the Response Body JSON Schema of your custom connector action.

 

Best regards,

Community Support Team _ Kris Dai
If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.

Hi @v-xida-msft Thanks for your quick reply. Removing the "rows" section is not an option as I get an empty result set with only the columns when I call the connector from PowerApps. Also this is not my custom API, I'm calling the Azure cost management API and that is how the response is returned from API -https://management.azure.com/{scope}/providers/Microsoft.CostManagement/query?api-version=2019-11-01

 

The issue is if I don't provide a default response body in the connector definition, then I only get a 200 response when I call the custom connector from within PowerApps and not the result set. Is there any other way of getting the result set without providing a response body within connector? Is there any other workaround to specify the default response?

 

This appears like a bug and needs resolving 

 

Thanks

Hi @Rajesh ,

For removing "rows" action from the Response Body JSON Schema, I mean thay just remove the "rows" section from the JSON schema you provided, and remain the other rest of column sections, as below:

{
  "id": "subscriptions/232a4132-b936-1212-8967-2aba520a753d/resourcegroups/rg-demo/providers/Microsoft.CostManagement/query/f528025f-6f3a-4ec2-92c8-aa2ede1c5401",
  "name": "f528025f-6f3a-4ec2-92c8-aa2ede1c5401",
  "type": "Microsoft.CostManagement/query",
  "properties": {
    "nextLink": null,
    "columns": [
      {
        "name": "PreTaxCost",
        "type": "Number"
      },
      {
        "name": "ResourceGroup",
        "type": "String"
      },
      {
        "name": "Currency",
        "type": "String"
      }
    ]
  }
}

After that, within the Response Body of your custom connector action, it would not contain the "rows" section, but other rest of column sections would be populated properly.

 

According to the issue that you mentioned, I afraid that there is no way to achieve your needs in PowerApps Custom connector, it is an known limit with the Response Body in Custom connector.

If you would like this feature to be added in PowerApps, please feel free to submit an idea to PowerApps Ideas Forum:

https://powerusers.microsoft.com/t5/Power-Apps-Ideas/idb-p/PowerAppsIdeas

 

Best regards,

Community Support Team _ Kris Dai
If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.

Hi @v-xida-msft , I've already tried removing the rows section and passing only the columns. This returns me only the schema and not the actual value i.e. when I call the connector from PowerApps button and put the response into a collection, collection contains only the schema and not actual values. The workaround I've at the moment is to call connector from flow, parse the response and call flow from PowerApps

Hi @Rajesh ,

It's my bad. I found that you have split the columns and values into different sections in your Response Body JSON Schema. According to the needs that you want to achieve your needs, I afraid that there is no way to achieve your needs in Custom connector in PowerApps.

 

As an alternative solution, you could consider fire a Power Automate flow from your canvas app, within the flow, you could send a HTTP Request to the cost management API directly, then handle the result in your flow, and then return the result back to your app.

The flow's configuration as below:

8.JPG

 

More details about firing a flow from a canvas app, please check the following video:

https://www.youtube.com/watch?v=1wl9AtxWdkg

 

Please also check and see if the following blog would help in your scenario:

https://powerapps.microsoft.com/en-us/blog/return-an-array-from-flow-to-powerapps-response-method/

 

Best regards,

Community Support Team _ Kris Dai
If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.

@v-xida-msft  This is a workaround and not an acceptable solution. I hope Microsoft would fix this issue. One thing that is strange is how Flow is able to get the response body when the same custom connector is called, but PowerApps can't. 

Hi @Rajesh ,

Sure. If you would like to get further help in this issue, please consider submit an assisted support ticket through the following link:

https://powerapps.microsoft.com/en-us/support/pro

 

 

Best regards,

Community Support Team _ Kris Dai
If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.

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