Can I add a lookup relationship using an external id on a before insert/update trigger?

I would like to create a lookup relationship to a parent object using the parents external id from a before insert/update trigger. I am not receiving an error when I do this, but it is not creating the relationship. I have tested using anonymous apex with a dml and the code works fine. In the example, Tech1_ID__c is the external id of the Property__c object.

trigger CaseAddressHandler on Case (before insert, before update) {
for(Case c: trigger.new){
  c.Property__r = new Property__c(Tech1_ID__c =c.Property_Id__c); 
  }
}

December 2, 2019
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Best Answer chosen by Andrew McNamara 13

Timo Bierbrauer
Looks like it't not working in triggers. Never found an answer why, only "solutions" to use the classical way of getting parent record ids via soql and manually mapping them to external ids...

February 21, 2022
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This was selected as the best answer

Qais Baltii
Looks like it't not working in triggers.
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March 10, 2022
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Can I add a lookup relationship using an external id on a before insert/update trigger?

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