# Readonly You can use `attr_readonly :title, :author` to prevent assign value to attribute after initialized. You can use `enable_readonly!` and `disable_readonly!` to control the behavior. **Important: It's no effect with embeds or array attributes !!!** #### enable\_attr\_readonly!, disable\_attr\_readonly! #### attr\_readonly\_enabled? #### without\_attr\_readonly(\&blk) #### readonly\_attribute?(attribute) #### readonly!, readonly? Mark the current model instance as `readonly`, which prevents any future attempts to save or update. The instance is still accessible, just frozen. The transition to `readonly`, is one-directional and cannot be reversed. If you need to write to this instance again, you'll have to `find` it again. This is different from marking an individual attribute as `readonly`, which can be reversed. ### Class methods #### readonly\_attributes Returns a Set of attributes that are marked with `attr_readonly` in your All Futures class. Attributes in the Set are presented as Strings. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://allfutures.leastbad.com/usage/readonly.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.