diff options
Diffstat (limited to 'guides/source')
-rw-r--r-- | guides/source/active_record_callbacks.md | 16 | ||||
-rw-r--r-- | guides/source/active_record_validations.md | 2 |
2 files changed, 16 insertions, 2 deletions
diff --git a/guides/source/active_record_callbacks.md b/guides/source/active_record_callbacks.md index ebdee446f9..4568b467ef 100644 --- a/guides/source/active_record_callbacks.md +++ b/guides/source/active_record_callbacks.md @@ -310,7 +310,7 @@ end ### Using `:if` and `:unless` with a `Proc` -Finally, it is possible to associate `:if` and `:unless` with a `Proc` object. This option is best suited when writing short validation methods, usually one-liners: +It is possible to associate `:if` and `:unless` with a `Proc` object. This option is best suited when writing short validation methods, usually one-liners: ```ruby class Order < ApplicationRecord @@ -338,6 +338,20 @@ class Comment < ApplicationRecord end ``` +### Combining Callback Conditions + +When multiple conditions define whether or not a callback should happen, an `Array` can be used. Moreover, you can apply both `:if` and `:unless` to the same callback. + +```ruby +class Comment < ApplicationRecord + after_create :send_email_to_author, + if: [Proc.new { |c| c.user.allow_send_email? }, :author_wants_emails?], + unless: Proc.new { |c| c.article.ignore_comments? } +end +``` + +The callback only runs when all the `:if` conditions and none of the `:unless` conditions are evaluated to `true`. + Callback Classes ---------------- diff --git a/guides/source/active_record_validations.md b/guides/source/active_record_validations.md index 0fda7c5cfd..0c57802188 100644 --- a/guides/source/active_record_validations.md +++ b/guides/source/active_record_validations.md @@ -934,7 +934,7 @@ end ### Using a Proc with `:if` and `:unless` -Finally, it's possible to associate `:if` and `:unless` with a `Proc` object +It is possible to associate `:if` and `:unless` with a `Proc` object which will be called. Using a `Proc` object gives you the ability to write an inline condition instead of a separate method. This option is best suited for one-liners. |