Provides a full validation framework to your objects.
A minimal implementation could be:
class Person include ActiveModel::Validations attr_accessor :first_name, :last_name validates_each :first_name, :last_name do |record, attr, value| record.errors.add attr, 'starts with z.' if value.to_s[0] == ?z end end
Which provides you with the full standard validation stack that you know from Active Record:
person = Person.new person.valid? # => true person.invalid? # => false person.first_name = 'zoolander' person.valid? # => false person.invalid? # => true person.errors # => #<OrderedHash {:first_name=>["starts with z."]}>
Note that ActiveModel::Validations automatically adds an errors method to your instances initialized with a new ActiveModel::Errors object, so there is no need for you to do this manually.
Returns the Errors object that holds all information about attribute error messages.
# File lib/active_model/validations.rb, line 169 169: def errors 170: @errors ||= Errors.new(self) 171: end
Performs the opposite of valid?. Returns true if errors were added, false otherwise.
# File lib/active_model/validations.rb, line 186 186: def invalid?(context = nil) 187: !valid?(context) 188: end
Runs all the specified validations and returns true if no errors were added otherwise false. Context can optionally be supplied to define which callbacks to test against (the context is defined on the validations using :on).
# File lib/active_model/validations.rb, line 176 176: def valid?(context = nil) 177: current_context, self.validation_context = validation_context, context 178: errors.clear 179: run_validations! 180: ensure 181: self.validation_context = current_context 182: end
Passes the record off to the class or classes specified and allows them to add errors based on more complex conditions.
class Person include ActiveModel::Validations validates :instance_validations def instance_validations validates_with MyValidator end end
Please consult the class method documentation for more information on creating your own validator.
You may also pass it multiple classes, like so:
class Person include ActiveModel::Validations validates :instance_validations, :on => :create def instance_validations validates_with MyValidator, MyOtherValidator end end
Standard configuration options (:on, :if and :unless), which are available on the class version of validates_with, should instead be placed on the validates method as these are applied and tested in the callback
If you pass any additional configuration options, they will be passed to the class and available as options, please refer to the class version of this method for more information
# File lib/active_model/validations/with.rb, line 123 123: def validates_with(*args, &block) 124: options = args.extract_options! 125: args.each do |klass| 126: validator = klass.new(options, &block) 127: validator.validate(self) 128: end 129: end
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