Question

Is there a way to validate an input field using just a few lines of code?

Right not I’ve to do this when using a custom validation.

Model

class Search < ActiveRecord::Base
  validates :email, :presence => true, :email => true
end

Validator

class EmailValidator < ActiveModel::EachValidator
  def validate_each(record, attribute, value)
    record.errors[attribute] << (options[:message] || "is not an email") unless
      value =~ /\A([^@\s]+)@((?:[-a-z0-9]+\.)+[a-z]{2,})\z/i
    end
  end
end

This is what I really want to do.

class Search < ActiveRecord::Base
  validates :email, :email => lambda  do |record, value|
    record.errors[:email] << "invalid field" unless value =~ /\A([^@\s]+)@((?:[-a-z0-9]+\.)+[a-z]{2,})\z/i
  end
end

Is that possible?

Answer 1

Here is my solution.

class Search < ActiveRecord::Base
  validate :my_custom_validator

  def my_custom_validator
    if @email.to_s.match(/hello/)
      self.errors[:email] << "Email can't contain the word 'hello'"
    end
  end
end