Ruby on rails 3 Rails中活动记录查询中查找器方法的顺序
我正在编写一个复杂的活动记录查询来从多个表中获取数据,该查询包含join、select、order、group和select whereRuby on rails 3 Rails中活动记录查询中查找器方法的顺序,ruby-on-rails-3,activerecord,Ruby On Rails 3,Activerecord,我正在编写一个复杂的活动记录查询来从多个表中获取数据,该查询包含join、select、order、group和select where @posts = Post.published.paginate(:order => 'popularity desc, id', :joins => [:comments, :images, :updates, :user],
@posts = Post.published.paginate(:order => 'popularity desc, id',
:joins => [:comments, :images, :updates, :user],
:conditions => conditions,
:group => "posts.id",
:select => "posts.id*,
:per_page => 10,
:page => params[:page])
我想知道根据标准,where、join等的顺序应该是什么,并最大限度地提高查询的性能。如果有人能写一个查询来解释序列,那将非常棒,就像
@posts = Post.published.joins(:comments, :images, :updates, :user).where(....
据我所知,顺序无关紧要 例如:
@posts = Post.published.select('posts.id').
joins(:comments, :images, :updates, :user).
where('users.email = ?', 'john@doe.com').
group('posts.id')