Append parameters to an existing PSCustomObject 'op_Addition' error in powershell - powershell

Question

Trying to parse through an Azure parameters template from gihub and update some parameters to the file in Powershell then commit it back to github for automation purposes. I seem to be erroring out on adding the new parameters back in to the file pulled from github. I've checked and made sure the objects are both the same.
I pull the JSON file down from github fine, convert it from JSON, compile my new parameter object and when i go to add the new parameters back into the original i receive the below error:
Method invocation failed because [System.Management.Automation.PSObject] does not contain a method named 'op_Addition'.
At line:1 char:1
+ $paramTemplate.parameters += $newparam
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : InvalidOperation: (op_Addition:String) [], RuntimeException
+ FullyQualifiedErrorId : MethodNotFound
Powerhell code:
#Get Content
$paramContent = (Invoke-WebRequest -Uri $parameterUri -Headers $headers -UseBasicParsing).content
$paramTemplate = $paramContent | ConvertFrom-Json
#define parameters in JSON Format
$addnewparam = #"
{
"parameters": {
"virtualMachineRG": {
"value": "$virtualMachineRG"
},
"virtualMachineName": {
"value": "$virtualMachineName"
},
"virtualMachineSize" : {
"value": "$virtualMachineSize"
},
"diagnosticsStorageAccountName": {
"value": "$diagnosticsStorageAccountName"
}
}
}
"#
$newparam = $addnewparam | ConvertFrom-JSON
$paramTemplate.parameters += $newparam
Any insight is greatly appreciated!
PS C:\GitHub\Azure> $paramtemplate.GetType()
>>
IsPublic IsSerial Name BaseType
-------- -------- ---- --------
True False PSCustomObject System.Object
PS C:\GitHub\Azure> $newparam.GetType()
IsPublic IsSerial Name BaseType
-------- -------- ---- --------
True False PSCustomObject System.Object
I've also tried matching the NoteProperty the same for both to no avail. I'm on PSVersion 5.1.17763.771
PS C:\GitHub\Azure> $paramtemplate | get-member
TypeName: System.Management.Automation.PSCustomObject
Name MemberType Definition
---- ---------- ----------
Equals Method bool Equals(System.Object obj)
GetHashCode Method int GetHashCode()
GetType Method type GetType()
ToString Method string ToString()
$schema NoteProperty string $schema=https://schema.management.azure.com/schemas/2015-01-01/deploymentParameters.json#
contentVersion NoteProperty string contentVersion=1.0.0.0
parameters NoteProperty System.Management.Automation.PSCustomObject parameters=#{subnetName=; virtualNetworkId=; virtualMachineName=; virtualMachineRG=; osDiskType=; virtualMachineSize=; admi...
PS C:\GitHub\Azure> $newparam | Get-Member
TypeName: System.Management.Automation.PSCustomObject
Name MemberType Definition
---- ---------- ----------
Equals Method bool Equals(System.Object obj)
GetHashCode Method int GetHashCode()
GetType Method type GetType()
ToString Method string ToString()
parameters NoteProperty System.Management.Automation.PSCustomObject parameters=#{virtualMachineRG=; virtualMachineName=; virtualMachineSize=; diagnosticsStorageAccountName=}

Answer 1

You can do the following if you want to update $paramtemplate.parameters property values with values from $newparam.parameters properties.
$newparam.parameters.PSObject.Properties.Name | Foreach-Object {
$paramtemplate.parameters.$_ = $newparam.parameters.$_
}
Since you are dealing with a PSCustomObject type in .parameters, .PSObject.Properties will return all of its properties. The .Name property returns the string name of the properties. $_ is the current object being processed within Foreach-Object { } script block.
You could do this slightly differently, which is uglier (IMO) but could be negligibly more performant.
$newparam.parameters.PSObject.Properties | Foreach-Object {
$paramtemplate.parameters.$($_.Name) = $_.Value
}
Note: If $newparam contains properties that $paramtemplate does not have, then we will have to add more logic to handle that case.
$newparam.parameters.PSObject.Properties | Foreach-Object {
if ($paramtemplate.parameters.PSObject.Properties.Name -contains $_.Name) {
$paramtemplate.parameters.$($_.Name) = $_.Value
}
else {
$paramtemplate.parameters | Add-Member -Type NoteProperty -Name $_.Name -Value $_.Value
}
}
Regarding the error message you received, this happened because you were attempting to add a PSCustomObject to another PSCustomObject. That type of operation requires your first object to be a collection. You can convert an object to a collection using the unary operator , just before you add the next object. The syntax is as follows:
$object1 = ,$object1 + $object2
EDIT
Looking more closely at these objects, it appears that all of the properties contain another PSCustomObject with a property called Value with some value that you will have supplied. In that case, the following will work for updating the template.
$newparam.parameters.PSObject.Properties | Foreach-Object {
if ($paramtemplate.parameters.PSObject.Properties.Name -contains $_.Name) {
$paramtemplate.parameters.$($_.Name).Value = $_.Value.Value
}
else {
$paramtemplate.parameters | Add-Member -Type NoteProperty -Name $_.Name -Value ([pscustomobject]#{Value = $_.Value.Value})
}
}

Answer 2

Try this:
$newparam | ForEach {
$paramtemplate.parameters | Add-Member -MemberType NoteProperty -Name $_.Name -Value $_.Value
}
This iterates over the psobject to add and adds properties one by one.