如何在Rails中按字母顺序对电影进行排序？

Question

如果您访问http://ccvideofinder.heroku.com/,这是我所指的一个很好的例子.

如何在Rails中完成？我在考虑使用case/ when语句,但是在与IRB搞砸了一段时间之后,我无法理解它.

---

在模型中:

class Movies < ActiveRecord::Base
  validates_presence_of :title

  def self.find_by_first_letter(letter)
    find(:all, :conditions => ['title LIKE ?', "#{letter}%"], :order => 'title ASC')
  end

end

在控制器中:

@result = Movie.find_by_first_letter(params[:letter])

Answer 1

# Simple Ordering    
@videos = Movie.order('title ASC')

# Implement the ordering outside of definition
@videos = Movie.find_by_first_letter('a').order('title ASC')

# Implement the order into your definition (as in example below)
@videos = Movie.find_by_first_letter('a')

可以找到ActiveRecord查询的文档:http: //guides.rubyonrails.org/active_record_querying.html#ordering

如果您希望将订单实施到您的find_by_first_letter定义中,那么您可以简单地将该.order()函数链接如下:

class Movie < ActiveRecord::Base
  validates_presence_of :title

  def self.find_by_first_letter(letter)
    where('title LIKE ?', "#{letter}%").order('title ASC')
  end
end