I have created a package and in it I have two custom objects foo__c and bar__c. My question is can I assume that their entity id (the first 3 digits of their id) is the same across all of the Orgs that use my package?
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Behavior of custom object prefix ID when using Change Sets
Knowledge Article Number: 000176809
Depending on the type of Sandbox you are using, a custom object prefix ID might change upon deploying it on a target organization. This article gives all the possible scenarios and their outcome.
Resolution
The list below assumes you are transferring a Change Set from a Sandbox to another Sandbox or a Production instance.
If you transfer a Change Set from
- Developer Sandbox to Full Sandbox
- Developer to Production.
- Configuration to Full Sandbox
- Configuration to Configuration Sandbox.
- Configuration To Production.
- Full Sandbox to Developer Sandbox
- Full Sandbox to Configuration Sandbox.
The custom object ID Prefix will be different. Salesforce will generate a new custom object ID.
If you transfer a Change Set from
- Full Sandbox to Production
- Configuration to Developer sandbox.
- Developer to Configuration Sandbox.
- Developer to Developer Sandbox
The custom object ID Prefix will remain the same.
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That is what I figured since a Production org can have multiple packages. – Louis Pujol Jun 17 '15 at 20:55
When a managed package is installed, the 3 digit prefix of a custom object will vary: the values are allocated perhaps on a "first custom object created" basis and so will vary from org to org.
So in your code you should not assume a fixed value but instead use e.g. DescribeSObjectResult.getKeyPrefix() or grab the first 3 characters of an ID that you know is of the correct type.
Yes! The package runs in your context.
The first 3 digit will be same across all the organisation where your package is installed.
