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max4904 Limiting or Forcing a 1:1 Relationship Between Objects
I want to create a new custom object that relates to the Opportunity object. I only want there to be one entry per Opportunity. I'd like to find a way to limit the relationship to be 1:1 only. I’ve created a Master-Detail relationship between the new object and the Opportunity object, but that doesn’t appear to limit the entries for the relationship. What settings or methods can I use to make this work?
Thanks.
You can have a trigger on the insert event of the child object, which willl check if the existing child count is less than 1 if yes the child will be inserted else an error will be raised.
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Hi,
You can achieve this using a workflow.
1) Create a custom field on the Custom object. Make the field unique. This field would be used to hold the ID of the associated Opportunity.
2) Create a Workflow rule on the Custom Object.
3) select the evaluation criteria to " Every time a record is created or edited"
4)Then rule criteria as OpportunityId "does not equal" (Leave the textbox empty)
5)In Workflow action, create a field update.
6) Select the custom field.
7) In the formula editor, select the field OpportunityId
8) click DONE and activate your worflow rule.
Hope this helps!
Thanks,
Sales4ce
I like this idea, but I am not familiar with Trigger syntax. What would the code look like/contain to make this work?