Dynamic schema in custom connector

[joerio]

I've created a custom connector which I initially only used in Power Automate. This custom connector uses dynamic schemas to determine the result object based on the input parameters. This is done in the swagger definition of the custom connector as described here https://docs.microsoft.com/en-us/connectors/custom-connectors/openapi-extensions#use-dynamic-values

This works fine in Power Automate. When I select some input data I can see a call in the network tab in developer tools in the browser, and i'm able to use my schema in the next steps in my flow.

However, when I use this same connector in PowerApps, I never get a result object. I'm unable to select any fields or use anything of the result of my calls. When I put the output directly in a variable or collection, I see something is in there, but i'm not able to use it. It doesn't have any named fields.

When I monitor this using developer tools in my browser, I see the actual data call with data returned. But never a schema call.

My question is, is dynamic schemas supported in PowerApps for a custom connector? And if so, is there anything specific I need to do to make this work?

[v-yutliu-msft · Accepted solution]

Hi @joerio ,

Yes, this is not supported in powerapps.

X-ms-dynamic-schema  is a kind of OpenAPI extension only supported for Logic Apps and Power Automate.

Here's a doc about the OpenAPI extensions that only supported for Logic Apps and Power Automate in details for your reference:

https://docs.microsoft.com/en-us/connectors/custom-connectors/openapi-extensions#x-ms-url-encoding

In powerapps, you could only provide an OpenAPI definition file without  including those OpenAPI extensions to create custom connectors.

Here's a doc about this solution for your reference:

https://docs.microsoft.com/en-us/connectors/custom-connectors/define-openapi-definition

Best regards,

[DavidMeu]

I also having issues with creating a dynamic schema based on my dynamic values.
Note that I need both params x-ms-dynamic-values and x-ms-dynamic-schema to be in my body request eventually.
(dynamic values are working as expected)
Can someone please assist?
This is my swagger (openapi 2.0):

paths:
  /api/v1/actions:
    get:
      description: Get lists
      summary: Get's action list you have access to
      operationId: GetActionsList
      parameters:
      - {in: query, name: include_attributes, default: ref, type: string, description: The
          number of items to skip before starting to collect the result set}
      responses:
        '200':
          description: OK
          schema: {$ref: '#/definitions/GetLists'}
  /api/v1/executions:
    post:
      description: Executing ST action - Uses Dynamic values and dynamic schema to
        draw form
      summary: Executing ST action
      operationId: ExecuteSTAction
      parameters:
      - in: body
        name: actionreq
        description: Action request execution.
        schema: {$ref: '#/definitions/ActionReq'}
      responses:
        '201': {description: Executed}
  /api/v1/actions/{actionId}:
    get:
      description: Gets the schema of the selected action
      summary: Get's the schema of the selected action
      operationId: GetActionSchema
      parameters:
      - {name: actionId, in: path, required: true, type: string, x-ms-summary: Select
          Action}
      responses:
        '200':
          description: OK
          schema: {type: object}
definitions:
  GetLists:
    type: array
    items:
      type: object
      properties:
        ref: {type: string}
      required: [ref]
  ActionReq:
    type: object
    properties:
      action:
        type: string
        description: ST action
        title: Select Action
        x-ms-summary: Select Action
        x-ms-dynamic-values: {operationId: GetActionsList, value-path: ref}
        x-ms-visibility: important
      actionschema:
        description: Dynamic Schema of items in selected action
        type: object
        x-ms-dynamic-schema:
          operationId: GetActionSchema
          parameters:
            actionId: {parameter: action}
          value-path: body/parameters
    required: [action, actionschema]
security:
- API Key: []

After selecting a value from the dynamic values no schema gets populated:

But my dynamic schema doesn't seems to work + my endpoint doesn't recognize actionschema as a body param in the custom connector UI.