Update content type in list not working

Question

My list content type is not getting updated.
I have a content type defined in a feature. I have created a new column and updated the feature definition and reactivated the feature.  I have also written powershell to check and update the content type with the new column.  The content type
gets updated but not at the list level.  The powershell looks like this:
Function UpdateContentType($contentType, $fieldLink)
if ($contentType.FieldLinks[$fieldLink.Name] -eq $null)
Write-Host Adding Field to content type
$contentType.FieldLinks.Add($fieldLink)
$contentType.Update($true)
I thought the Update method was supposed to push the changes down, but it doesn't seem to be working.  This code does work in a different environment so I'm not what is going on.
Caroline

Answer 1

You will need to updated the list also, after updating the content type
This is sample code how you update list which is using the Content Type.
IList<SPContentTypeUsage> usage = SPContentTypeUsage.GetUsages(newsCT);
foreach (SPContentTypeUsage item in usage)
if (item.IsUrlToList)
SPList list = rootWeb.GetList(item.Url);
if (!list.Fields.ContainsField(firstName.InternalName))
list.Fields.Add(firstName);
list.Update();
more information you can check at this link
get2pallav
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