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I stumbled across an Apex method in the documentation recently that would generate a URL for the download link for a standard Attachment, with a name something like getDownloadLink(). I don't remember the System class or what parameters it took, but I'd prefer using that in the backend to hardcoding

'/servlet/servlet.FileDownload?file='+myAttachmentId

Does anyone know where I can find this method? I made a mental, but not physical, note of its location in the docs... :(

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You're looking for getFileFieldUrl from the URL Class.

getFileFieldURL(entityId, fieldName)

Returns the download URL for a file attachment.

Signature

public static String getFileFieldURL(String entityId, String fieldName)

Parameters

entityId

Type: String

Specifies the ID of the entity that holds the file data.

fieldName

Type: String

Specifies the API name of a file field component, such as AttachmentBody.

Return Value

Type: String

Usage

Example:

Example

 String fileURL =
 URL.getFileFieldURL(
     '087000000000123' ,
     'AttachmentBody');
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  • It only works with Ideas as mentioned by Daniel here?
    – Raul
    Commented Oct 18, 2017 at 11:23
  • @RahulSharma it works on other types, too. It used to be limited, but had since had other types added. It's a pretty handy method.
    – sfdcfox ♦
    Commented Oct 18, 2017 at 14:00
  • This method doesn't work for Attachment. If we try to execute it System.debug( URL.getFileFieldURL( '00P1s000000diCg' , 'Body') ); it would fail with error System.HandledException: Invalid parameter value \"Body\" for parameter \"fieldName\" . Is there any other way rather than building URL explicitly with '/servlet/servlet.FileDownload?file=' + a.Id ? Which attachments does support this method if it doesn't support the standard Attachment object?
    – Patlatus
    Commented Jul 24, 2020 at 8:50

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