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I want to set the Description field on Contact object same as the Industry field on the Account object. But when I am executing the below code I am getting error A non foreign key field cannot be referenced in a path expression: AccountId. Can someone please explain why I am getting this error and how to go to the Industry field on the Account object from Contact object.

for(Contact c : [Select Id,AccountID,Description from Contact])
     {
         c.description = c.AccountID.Industry;
     }
2

You need to use the parent relationship name when you pull fields from upstream in a field path. For AccountId, the proper relationship name is Account.

Incorrect

AccountId.Industry

Correct

Account.Industry

Please note this field path must also be included in the query itself.

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