How to validate enum in rails?
In Rails 7.1, validating enums has become easier with the introduction of the validate method.
This method allows you to ensure that the value assigned to an enum attribute is valid, providing a cleaner and more maintainable approach compared to previous versions of Rails.
Syntax:
enum status: { draft: 0, published: 1, archived: 2 }, validate: true
Example:
class Post < ApplicationRecord
enum status: { draft: 0, published: 1, archived: 2 }, validate: true
end
post = Post.new
post.valid? # false
post.errors.full_messages # ["Status is not included in the list"]
post.status = :invalid
post.valid? # false
post.errors.full_messages # ["Status is not included in the list"]
post.status = :draft
post.valid? # true
Allow nil values
If you want to allow nil values for the enum attribute, you can use the allow_nil option.
Syntax:
enum status: { draft: 0, published: 1, archived: 2 }, validate: { allow_nil: true }
Example
class Post < ApplicationRecord
enum status: { draft: 0, published: 1, archived: 2 }, validate: { allow_nil: true }
end
post = Post.new
post.valid? # true
post.status = :draft
post.valid? # true
post.status = :invalid
post.valid? # false
post.errors.full_messages # ["Status is not included in the list"]
NOTE: If validate option is not provided rails will rails an ArgumentError.
post.status = :unknown # 'unknown' is not a valid status (ArgumentError)