Updated README.md to include information about conditionalCreateOnlyP… #148
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…roperties schema property
ammokhov
reviewed
May 9, 2024
| @@ -34,6 +34,7 @@ Certain properties of a resource are _semantic_ and have special meaning when us | |||
| * **`readOnlyProperties`**: A property in the `readOnlyProperties` list cannot be specified by the customer. | |||
| * **`writeOnlyProperties`**: A property in the `writeOnlyProperties` cannot be returned in a **READ** or **LIST** request, and can be used to express things like passwords, secrets or other sensitive data. | |||
| * **`createOnlyProperties`**: A property in the `createOnlyProperties` cannot be specified in an **UPDATE** request, and can only be specified in a **CREATE** request. Another way to think about this - these are properties which are 'write-once', such as the [`Engine`](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-properties-rds-database-instance.html#cfn-rds-dbinstance-engine) property for an [`AWS::RDS::DBInstance`](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-properties-rds-database-instance.html) and if you wish to change such a property on a live resource, you should replace that resource by creating a new instance of the resource and terminating the old one. This is the behaviour CloudFormation follows for all properties documented as _'Update Requires: Replacement'_. An attempt to supply these properties to an **UPDATE** request will produce a runtime error from the handler. | |||
| * **`conditionalCreateOnlyProperties`**: A property in the `conditionalCreateOnlyProperties` can only be updated under certain conditions. For example, you can upgrade the engine version of an RDS DBInstance but you cannot downgrade it. When updating this property for a resource in a CloudFormation stack, the resource will be replaced if it cannot be updated. | |||
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I think we need to mention that such properties behave like createOnlyProperties only when specific values are changed. Such scenarios MUST be handled by UpdateHandler throwing NotUpdatable exception
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Description of changes:
Added a section to the README.md about
conditionalCreateOnlyPropertiesBy submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.