使用 FriendlyID 在 Rails 中独立于标题编辑 slug

Question

我正在创建一个 Blog Rails webapp。我决定使用 FriendlyID gem，我想在编辑视图上添加自定义 slug 的功能）。但是，slug 似乎无法自行修改。目前，slug 仅在标题运行时更新，我希望有一个可以独立更新且不一定与标题绑定的 slug

博客.rb

class Blog < ApplicationRecord
  enum status: { draft: 0, published: 1 }

  extend FriendlyId
  friendly_id :title, :use => [:slugged, :history]

  def should_generate_new_friendly_id?
    slug.blank? || title_changed?
  end
end

blog_controller.rb

def set_blog
  @blog = Blog.friendly.find(params[:id])
end

Answer 1

看看friendly_id wiki page这个帖子

假设您希望您的 Blog 能够独立于标题（slug 的来源）编辑 slug，并且不默认为另一个字段：

class Blog < ActiveRecord::Base
  attr_accessor :temporary_slug
  extend FriendlyId
  friendly_id :slug, :use => [:slugged]

  def should_generate_new_friendly_id?
    temporary_slug_changed?
  end

 # track changes in non persisted attribute

  def temporary_slug=(value)
    attribute_will_change!('temporary_slug') if temporary_slug != value
    @temporary_slug = value
  end

  def temporary_slug_changed?
    changed.include?('temporary_slug')
  end

end

示例输出如下所示：

blog = Blog.create(title: "How Long is a Long Long Time")
blog.slug 
# nil
post = Blog.update_attributes(title: "Some other title", temporary_slug: "My favorite blog")
blog.slug 
# 'my-favorite-blog'

否则，如果您希望 slug 默认为标题的版本，您可以这样做：

class Blog < ActiveRecord::Base
  extend FriendlyId
  friendly_id :title, :use => [:slugged]
  validates_presence_of :title

  def should_generate_new_friendly_id?
    if !slug?
      name_changed?
    else
      false
    end
  end
end

blog = Blog.create(title: "How Long is a Long Long Time", slug: 'how-long')
blog.slug 
# 'how-long'
blog = Blog.create(title: "How Long is a Long Long Time")
blog.slug 
# 'how-long-is-a-long-long-time'