rails 4语法修改

Question

如何使用rails 4新语法重写下面的代码。

Tracker.find(:all, :joins => :projects, 
         :select => "DISTINCT #{Tracker.table_name}.*", 
         :conditions => ["#{Project.table_name}.lft >= ? AND #{Project.table_name}.rgt <= ? AND #{Project.table_name}.status <> #{STATUS_ARCHIVED}", lft, rgt], 
         :order => "#{Tracker.table_name}.position") 

Answer 1

下面是等价的方式：

Tracker.joins(:projects) 
     .where("#{Project.table_name}.lft >= ? AND #{Project.table_name}.rgt <= ? AND #{Project.table_name}.status <> #{STATUS_ARCHIVED}", lft, rgt) 
     .select("DISTINCT #{Tracker.table_name}.*") 
     .order("#{Tracker.table_name}.position")