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Our form is overwriting existing contacts when a new submission is made.

All of our dedup rules are related to same names and emails; I do not see any dedup rule that would overwrite a (seemingly random) contact record with a new contact's information.

How can I prevent this in the future?

This issue began with my question here.The suggestion was excellent, and helped me get to a better understanding of what happened. But I'm still missing precisely where the overwrite is happening. (To be fair, the full suggestion is to check the logs, but I lack the ability to write a query that pinpoints what I want to understand)

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  • for checking the logs try the log viewer extension: github.com/adixon/ca.civicrm.logviewer
    – petednz - fuzion ♦
    Commented Dec 5, 2019 at 9:01
  • Can you be more specific about the form? Is it a Drupal webform, a profile form, a contribution form? Each of those has it's own configuration for how to handle potential duplicates.
    – Alan Dixon
    Commented Dec 5, 2019 at 15:21
  • Are the forms being submitted by logged-in users, or 'anonymously'? If by logged-in users, see this extension - civicrm.org/extensions/no-overwrite
    – Joe McLaughlin
    Commented Dec 5, 2019 at 19:14
  • thanks to all. @petednz - I am checking the logs, thanks.
    – LaurynnLowe
    Commented Dec 5, 2019 at 23:35
  • @AlanDixon it's a drupal form with civi webform integration
    – LaurynnLowe
    Commented Dec 5, 2019 at 23:39

2 Answers 2

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Thanks for everyone's input. It was a very odd matching rule, one that matched on last name with length = 1, weight = 1. I will see when this was added to the site.

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    Ouch. Ouch. Ouch (x3 to get over the minimum 10 characters for a comment!)
    – petednz - fuzion ♦
    Commented Dec 6, 2019 at 2:53
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What is your Matching Rule in the Webform configured at? This is where you find that:

enter image description here

Next -> post a screenshot of that Rule (in your CiviCRM config) as well as a Screenshot of your Webform tab (showing all the elements on the form as well as their Form_keys

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