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newbie here,

I am trying to create an LWC for moving data existing in a custom (Dump) object to the standard Contact object. This LWC will have a button, which when clicked will upsert the data present in the dump object to the contact object, matching the external IDs. However, I am struggling with creating the controller class and the Javascript for the LWC. I have the basic pseudocode for it. I would appreciate it if someone could help me with the codes. TIA

Here is the pseudocode/ proposed method:

  • get data from contacts in the controller class and store it in a list
  • get data from the dump object in the controller class and store it in a list
  • create two lists named 'contacts to insert' and 'contacts to update'
  • loop over the dump objects records
  • in the loop, check if the external ID exists in the list of contacts created earlier, if it does, add the dump object record to the 'contacts to update' list
  • else add it to the 'contacts to insert' list
  • insert the 'contacts to insert' list
  • update the 'contacts to update' list

End

BTW I have created the HTML script for the LWC component (button).

Please let me know if this approach can be improved and/or the code for the LWC controller class.

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You can create a single List to Upsert the records by matching the External Id.

Please refer updating a records using external Id in Apex

In LWC Javascript, call the Apex method imperatively on HTML button click to perform the steps

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