**FastAPI** will do the automatic conversion from the request, so that the parameter `item` receives its specific content and the same for `user`.

It will perform the validation of the compound data, and will document it like that for the OpenAPI schema and automatic docs.

## Singular values in body

          Size of each xDS push.
        |||
      ),
    ]),
  ], panelHeight=10, startY=3)
  + grid.makeGrid([
    row.new('Webhooks')
    + row.withPanels([
      panels.timeSeries.simple(
        'Validation', queries.validateWebhook, |||
          Rate of XDS push operations, by type. This is incremented on a per-proxy basis.
        |||
      ),
      panels.timeSeries.simple(

    /**
     * Prepares to load or create a model. Does nothing if the cached model is available or else prepares to capture
     * configuration fingerprints and validation problems and then runs the given function.
     */
    fun maybePrepareModel(action: () -> Unit)

    /**

    ```

## Recap

With `Query`, `Path` (and others you haven't seen yet) you can declare metadata and string validations in the same ways as with [Query Parameters and String Validations](query-params-str-validations.md){.internal-link target=_blank}.

And you can also declare numeric validations:

* `gt`: `g`reater `t`han
* `ge`: `g`reater than or `e`qual
* `lt`: `l`ess `t`han
* `le`: `l`ess than or `e`qual