如何在rails中创建ActiveModel对象3

Question

我在ActiveRecord上有以下模型类。如何为这个类编写一个等效的ActiveModel？

class Recommendation < ActiveRecord::Base
  def self.columns() @columns ||= []; end
  def self.column(name, sql_type = nil, default = nil, null = true)
    columns << ActiveRecord::ConnectionAdapters::Column.new(name.to_s, default, sql_type.to_s, null)
  end
  column :from_email, :string
  column :to_email, :string
  column :article_id, :integer
  column :message, :text
  serialize :exception
  validates_format_of :from_email, :to_email, :with => /^[-a-z0-9_+.]+@([-a-z0-9]+.)+[a-z0-9]{2,4}$/i
  validates_length_of :message, :maximum => 500
  belongs_to :article
end

Answer 1

我建议您从一个普通类开始，然后开始添加ActiveModel模块。比如说，从验证开始。

http://api.rubyonrails.org/classes/ActiveModel/Validations.html

class Recommendation
  include ActiveModel::Validations
  attr_accessor :from_email, :to_email, :article_id, :message
  validates_format_of :from_email, :to_email, :with => /^[-a-z0-9_+.]+@([-a-z0-9]+.)+[a-z0-9]{2,4}$/i
  validates_length_of :message, :maximum => 500
end

其他ActiveModel文档可以在http://api.rubyonrails.org/