add condition

先写一个方法。

 

class Array
  def add_condition(condition, conjunction = 'and')
    if condition.is_a? Array
      if self.empty?
        (self << condition).flatten!
      else
        self[0] += " #{conjunction} " + condition.shift
        (self << condition).flatten!
      end
    elsif condition.is_a? String
      self[0] += " #{conjunction} " + condition
    else
      raise "don't know how to handle this condition type"
    end
    self
  end
end

 

具体示例：

 

conditions = ['active = ? and type = ?', true, 2]
conditions.add_condition ['person_id = ?', 345]