functions/public/Get-DataMartEntitiesMetadata.ps1

function Get-DatamartEntitiesMetadata {
    [CmdletBinding()]
    param (
        [Parameter(Mandatory = $true)] [string] $dataMartId,
        [Parameter(Mandatory = $true)] [string] $metadataUrl,
        [Parameter(Mandatory = $true)] [string] $accessToken
    )

    $url = "$($metadataUrl.TrimEnd("/"))/DataMarts($dataMartId)/Entities"

    $headers = @{"Accept" = "application/json"}
    if ($accessToken) {
        $headers.Add("Authorization", "Bearer $accessToken")
    }

    try {
        Write-DosMessage -Level "Information" -Message "Invoking Metadata Service for data mart entities. GET: $url"
        $output = @()
        do {
            $pageInfo = Invoke-RestMethod -Method Get -Uri $url -ContentType "application/json" -Headers $headers -UseBasicParsing;
            $output += if ($pageInfo.PSobject.Properties.Name -contains "value") { $pageInfo.value }
            else { $pageInfo };
            $url = $pageInfo.'@odata.nextLink';
        }
        while ($url);        
    }
    catch [System.Net.WebException] {
        Write-DosMessage -Level "Fatal" -Message "There was an error communicating with the Metadata Service.`n
        Request: $url`n
        Status Code: $($_.Exception.Response.StatusCode.value__)`n
        Message: $($_.Exception.Response.StatusDescription)"

    }
    return $output
}
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