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Make the value of Rails | validation available for external reference

2019/04/16に公開

Solution

It's a simple way. Write the validation value as a constant.

 class Book < ActiveRecord::Base TITLE_MAXIMUM_LENGTH = 100 validates :title, length: { maximum: TITLE_MAXIMUM_LENGTH } end

 Book::TITLE_MAXIMUM_LENGTH # => 20

It's redundant as it is. Write in one line using the return value of the constant declaration.

 class Book < ActiveRecord::Base validates :title, length: { maximum: TITLE_MAXIMUM_LENGTH = 100 } end

Book.validators_on(:title) method returns an array. It was troublesome to get the value of specific validation, so this method was used.

Please let me know if there is something else.

何か質問、悩み事、相談などあればLINEオープンチャットもご利用ください。

2019-04-16