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Diffstat (limited to 'guides/source/active_record_callbacks.md')
| -rw-r--r-- | guides/source/active_record_callbacks.md | 20 |
1 files changed, 4 insertions, 16 deletions
diff --git a/guides/source/active_record_callbacks.md b/guides/source/active_record_callbacks.md index 2a1c960887..77bd3c97e8 100644 --- a/guides/source/active_record_callbacks.md +++ b/guides/source/active_record_callbacks.md @@ -36,7 +36,7 @@ class User < ApplicationRecord before_validation :ensure_login_has_a_value - protected + private def ensure_login_has_a_value if login.nil? self.login = email unless email.blank? @@ -66,7 +66,7 @@ class User < ApplicationRecord # :on takes an array as well after_validation :set_location, on: [ :create, :update ] - protected + private def normalize_name self.name = name.downcase.titleize end @@ -77,7 +77,7 @@ class User < ApplicationRecord end ``` -It is considered good practice to declare callback methods as protected or private. If left public, they can be called from outside of the model and violate the principle of object encapsulation. +It is considered good practice to declare callback methods as private. If left public, they can be called from outside of the model and violate the principle of object encapsulation. Available Callbacks ------------------- @@ -202,11 +202,9 @@ The following methods trigger callbacks: * `create` * `create!` -* `decrement!` * `destroy` * `destroy!` * `destroy_all` -* `increment!` * `save` * `save!` * `save(validate: false)` @@ -290,7 +288,7 @@ Article destroyed Conditional Callbacks --------------------- -As with validations, we can also make the calling of a callback method conditional on the satisfaction of a given predicate. We can do this using the `:if` and `:unless` options, which can take a symbol, a string, a `Proc` or an `Array`. You may use the `:if` option when you want to specify under which conditions the callback **should** be called. If you want to specify the conditions under which the callback **should not** be called, then you may use the `:unless` option. +As with validations, we can also make the calling of a callback method conditional on the satisfaction of a given predicate. We can do this using the `:if` and `:unless` options, which can take a symbol, a `Proc` or an `Array`. You may use the `:if` option when you want to specify under which conditions the callback **should** be called. If you want to specify the conditions under which the callback **should not** be called, then you may use the `:unless` option. ### Using `:if` and `:unless` with a `Symbol` @@ -302,16 +300,6 @@ class Order < ApplicationRecord end ``` -### Using `:if` and `:unless` with a String - -You can also use a string that will be evaluated using `eval` and hence needs to contain valid Ruby code. You should use this option only when the string represents a really short condition: - -```ruby -class Order < ApplicationRecord - before_save :normalize_card_number, if: "paid_with_card?" -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: |