[SalesForce] Cannot update contentDocumentId in contentDocumentLink

I am sharing a file with a task by creating ContentDocumentLink.

The LinkedEntityId points to the task record.

Now, if a certain update happens to a parent record then i am trying to update only ContentDocumentId in the ContentDocumentLink that was previously inserted.

However, i am getting an exception,

execution of BeforeUpdate caused by: System.SObjectException: Field is
not writeable: ContentDocumentLink.ContentDocumentId

Do I need to delete previous ContentDocumentLink and insert a new ContentDocumentLink with updated ContentDocumentId?

Can't we update ContentDocumentId in ContentDocumentLink directly?

Best Answer

ContentDocumentId is of type reference and Properties are Create, Filter, Group, Sort. It is ID of the document which have been linked with any record.

Note:- Once you create a ContentDocumentLink, You can not update it.

If you are trying to change ContentDocumentId means you want to remove the current document shared with it and replace it with another document.

You must create another ContentDocumentLink with ContentDocumentId having your desired new document and LinkentityId with the record id of the record with which you want to share.

Side Note:- Inserting a new document needs to insert using ContentVersion Object as you cannot insert ContentDocument.

So, Your answer would be:-

Yes, you need to delete the previous ContentDocumentLink and insert a new ContentDocumentLink with updated ContentDocumentId
No, You can not update ContentDocumentId in ContentDocumentLink directly

Reference:-

Related Solutions

[SalesForce] ContentDocumentLink filter error on ContentDocumentID using IN clause

the solution is to add your keySet() from Map to a new Set() and use that in the query filter using IN:

Ex:

Set<Id> newSet = mapOfContentVersion.keySet();


[SELECT ContentDocumentID, LinkedEntity.type, LinkedEntityId 
                                    FROM ContentDocumentLink 
                                    WHERE ContentDocumentID IN: newSet ]

**This worked for me today

[SalesForce] Apex Trigger Error Before Updating SELF_REFERENCE_FROM_TRIGGER

First, you should not use queries or DML operations in a loop. Please read Best Practice: Bulkify Your Code for more details. Basically, for queries, you need to gather your inputs, query once, and use Maps afterwards. For DML operations, make a list, add all the items to the list, then perform the operation.

Second, you should use Checkpoints instead of spamming debug statements. You don't want those getting in to your production code, because it'll drastically reduce your code's performance (i.e. your users will notice it takes longer to save records, and will complain about slowness, and not want to adopt Salesforce).

Third, you don't need to check before you insert/update/delete an empty list; this is a vestige left over from when governor limits were consumed by empty lists, which is no longer true. Now, such checks just waste CPU time and clutter up code.

Fourth, as to the actual error, I suspect that since the line item's schedule is changing, it causes a recursive trigger call back to the line item. You should instead use if(Trigger.isUpdate && Trigger.isAfter) instead of Trigger.isBefore, which should limit the recursion, since the database will be in its post-updated state at that point.

Best Answer

Related Solutions

[SalesForce] ContentDocumentLink filter error on ContentDocumentID using IN clause

[SalesForce] Apex Trigger Error Before Updating SELF_REFERENCE_FROM_TRIGGER

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