add additional properties support to powershell client generator (#6528)

samples/client/petstore/powershell/src/PSPetstore/Model/Tag.ps1

@@ -77,12 +77,14 @@ function ConvertFrom-PSJsonToTag {
         $PSBoundParameters | Out-DebugParameter | Write-Debug
 
         $JsonParameters = ConvertFrom-Json -InputObject $Json
+        $PSTagAdditionalProperties = @{}
 
         # check if Json contains properties not defined in PSTag
         $AllProperties = ("id", "name")
         foreach ($name in $JsonParameters.PsObject.Properties.Name) {
+            # store undefined properties in additionalProperties
             if (!($AllProperties.Contains($name))) {
-                throw "Error! JSON key '$name' not found in the properties: $($AllProperties)"
+                $PSTagAdditionalProperties[$name] = $JsonParameters.PSobject.Properties[$name].value
             }
         }
 
@@ -101,6 +103,7 @@ function ConvertFrom-PSJsonToTag {
         $PSO = [PSCustomObject]@{
             "id" = ${Id}
             "name" = ${Name}
+            "AdditionalProperties" = $PSTagAdditionalProperties
         }
 
         return $PSO

samples/client/petstore/powershell/src/PSPetstore/PSPetstore.psd1

@@ -3,7 +3,7 @@
 #
 # Generated by: OpenAPI Generator Team
 #
-# Generated on: 5/19/20
+# Generated on: 6/3/20
 #
 
 @{
@@ -87,7 +87,8 @@ FunctionsToExport = 'Add-PSPet', 'Remove-Pet', 'Find-PSPetsByStatus', 'Find-PSPe
                'Set-PSConfiguration', 'Set-PSConfigurationApiKey', 
                'Set-PSConfigurationApiKeyPrefix', 
                'Set-PSConfigurationDefaultHeader', 'Get-PSHostSetting', 
-               'Get-PSUrlFromHostSetting'
+               'Get-PSUrlFromHostSetting', 'Set-PSConfigurationHttpSigning', 
+               'Get-PSConfigurationHttpSigning'
 
 # Cmdlets to export from this module, for best performance, do not use wildcards and do not delete the entry, use an empty array if there are no cmdlets to export.
 CmdletsToExport = @()