Named_scope 与 lambda rails 4

Question

我需要将其重构为 rails 4 样式

型号名称Invoice

我有

 named_scope :with_name_like, lambda { |name|
     name.blank? ? {} : { :conditions => ['LOWER(name) LIKE ?', "%#{name.downcase}%"], :joins => :client }
   }

我做到了

  def self.with_name_like
    ->(name){where('LOWER(name) LIKE ?', "%#{name.downcase}%").joins(:client)}
  end

但得到

 Invoice.with_name_like
 => #<Proc:0x00000004f35d50@/home/stasyan/current/app/models/invoice.rb:23 (lambda)>

如何将三元运算符放入此方法？使用 lambda？

以及如何使用最新语法

named_scope :ordered, :order => "date DESC"

谢谢

Answer 1

您可以简单地使用 all:

scope :with_name_like, ->(name) {
  name.blank? ? all : where('LOWER(name) LIKE ?', "%#{name.downcase}%").joins(:client)
}

Answer 2

我建议

def self.with_name_like(name)
  if name
    where('LOWER(name) LIKE ?', "%#{name.downcase}%").joins(:client)
  else
    self
  end
end

我更喜欢 class 方法而不是参数化范围定义。

Named_scope 与 lambda rails 4

Named_scope with lambda rails 4

ruby

lambda

ruby-on-rails