AtMostOneOf

[arxeiss]

SDK version

github.com/hashicorp/terraform-plugin-sdk/v2 v2.4.4

Use-cases

I have some optional attributes, but only one of them can be set. Something like ExactlyOneOf but accept also none of them.

Proposal

Maybe add something like AtMostOneOf similar to ExactlyOneOf.

References

I saw there was first attempt to create this in #225 but then it was changed to ExactlyOneOf

[arxeiss]

OK, I have found, that ConflictsWith is exactly what I want. So there is no need to add AtMostOneOf or something like that.

However I think, the documentation could be fixed a little bit. There is written this:

// ConflictsWith is a set of schema keys that conflict with this schema.
// This will only check that they're set in the _config_. This will not
// raise an error for a malfunctioning resource that sets a conflicting key.

Which I understood is just checking I have the correct schema. Ie raising error during this, because category_id conflicts with department_id, which does not exist in the schema.

return &schema.Resource{
	Schema: map[string]*schema.Schema{
		"category_id": &schema.Schema{
			Type:          schema.TypeString,
			ConflictsWith: []string{"department_id"}
		}
		// "department_id": &schema.Schema{
		//	Type:          schema.TypeString,
		//	ConflictsWith: []string{"category_id"}
		// }
	}
}

[github-actions]

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