method

on

Ruby on Rails latest stable (v7.1.3.2) - 1 note - Class: ActiveRecord::Errors

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What's this?

Method deprecated or moved

This method is deprecated or moved on the latest stable version. The last existing version (v2.3.8) is shown here.

These similar methods exist in v7.1.3.2:

Arel::SelectManager#on

on(attribute) public

Returns nil, if no errors are associated with the specified attribute. Returns the error message, if one error is associated with the specified attribute. Returns an array of error messages, if more than one error is associated with the specified attribute.

  class Company < ActiveRecord::Base
    validates_presence_of :name, :address, :email
    validates_length_of :name, :in => 5..30
  end

  company = Company.create(:address => '123 First St.')
  company.errors.on(:name)      # => ["is too short (minimum is 5 characters)", "can't be blank"]
  company.errors.on(:email)     # => "can't be blank"
  company.errors.on(:address)   # => nil

Show source

# File activerecord/lib/active_record/validations.rb, line 212
    def on(attribute)
      attribute = attribute.to_s
      return nil unless @errors.has_key?(attribute)
      errors = @errors[attribute].map(&:to_s)
      errors.size == 1 ? errors.first : errors
    end

August 8, 2014 - (v3.0.0 - v4.0.2)

0 thanks

Deprecated in favour of []

In Rails 3+

company.errors[:name]

In Rails 2.3 and below:

company.errors.on(:name)

on

Related methods

Method deprecated or moved

Deprecated in favour of []