Conditional Validation
Conditional Validation allows controllers to communicate with models about whether or not certain validations should be run. This is great for multi-page wizards and context-dependent validations.
Compatibility
Tested with:
- Ruby: MRI 2.0.0
- Rails: 4.0.1
Installation
Add this line to your application's Gemfile:
gem "conditional_validation"
And then execute:
bundle
Usage
First, define a validation accessor:
# app/models/some_model.rb
class SomeModel
validation_accessor :some_grouping_name
end
Then, this model will receive the following methods for conditional validation:
enable_some_grouping_name_validation # Enables conditional validation
disable_some_grouping_name_validation # Disables conditional validation
validate_on_some_grouping_name? # Check if conditional validation is enabled
A "Real World" Example
# app/models/user.rb
User < ActiveRecord::Base
validation_accessor :address_attributes # Initialize conditional validation on address attributes
with_options if: :validate_on_address_attributes? do |obj|
obj.validates :street, presence: true
obj.validates :city, presence: true
# ...
end
end
# app/controllers/user_controller.rb
def update
current_user.enable_address_attributes_validation # Enable conditional validation on address attributes
if current_user.save
current_user.disable_address_attributes_validation # Not necessarily needed, but disables conditional validation on address attributes
# ...
end
end
Method Chaining
The enable and disable methods allow for method chaining so that multiple validation accessors may be enabled/disabled at once:
if current_user.enable_address_attributes_validation.enable_some_other_validation.save
# ...
end
Author
- Paul Dobbins