用户可编辑带有友好 ID 的 slugs

Case:

我的站点表单包含一个 slug 字段，如果输入了值，则应将其用作 slug。

编辑：一些澄清：

我想要的很像 slugs 在 WordPress 中的工作方式：

• 如果未提供 slug -> slug 名称
• 如果提供了 slug -> 使用用户输入的 slug
• 如果 slug 已更新 -> 将旧的 slug 推送到历史记录

我的问题：

无法弄清楚如何获取友好 ID 来使用用户提供的 slug。

class Station < ActiveRecord::Base
  extend FriendlyId
  belongs_to :user
  has_many  :measures
  validates_uniqueness_of :hw_id
  validates_presence_of :hw_id
  class_attribute :zone_class
  self.zone_class ||= Timezone::Zone
  friendly_id :name, :use => [:slugged, :history]

  before_save :set_timezone!

  ....

  def should_generate_new_friendly_id?
    name_changed? or slug_changed?
  end
end

edit:

<%= form_for(@station) do |f| %>

<%=
    f.div_field_with_label(:name) do |key|
      f.text_field(key)
    end
%>
<%=
    f.div_field_with_label(:slug) do |key|
      f.text_field(key)
    end
%>
<%=
    f.div_field_with_label(:hw_id, 'Hardware ID') do |key|
      f.text_field(key)
    end
%>
<%=
    f.div_field_with_label(:latitude) do |key|
      f.text_field(key)
    end
%>
<%=
    f.div_field_with_label(:longitude) do |key|
      f.text_field(key)
    end
%>
<%= f.div_field_with_label(:user_id, "Owner") do |key|
        f.select(:user_id, options_from_collection_for_select(User.all, :id, :email), { include_blank: true  })
    end
%>

  <div class="actions">
    <%= f.submit %>
  </div>
<% end %><%= form_for(@station) do |f| %>

<%=
    f.div_field_with_label(:name) do |key|
      f.text_field(key)
    end
%>
<%=
    f.div_field_with_label(:slug) do |key|
      f.text_field(key)
    end
%>
<%=
    f.div_field_with_label(:hw_id, 'Hardware ID') do |key|
      f.text_field(key)
    end
%>
<%=
    f.div_field_with_label(:latitude) do |key|
      f.text_field(key)
    end
%>
<%=
    f.div_field_with_label(:longitude) do |key|
      f.text_field(key)
    end
%>
<%= f.div_field_with_label(:user_id, "Owner") do |key|
        f.select(:user_id, options_from_collection_for_select(User.all, :id, :email), { include_blank: true  })
    end
%>

  <div class="actions">
    <%= f.submit %>
  </div>
<% end %>

这就是我解决它的方法：

class Station < ActiveRecord::Base
  extend FriendlyId
  belongs_to :user
  has_many  :measures
  validates_uniqueness_of :hw_id
  validates_presence_of :hw_id
  class_attribute :zone_class
  self.zone_class ||= Timezone::Zone
  friendly_id :name, :use => [:slugged, :history]
  before_save :evaluate_slug
  before_save :set_timezone!


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

end

和测试：

/spec/models/station_spec.rb

describe Station do
  ...   
  let(:station) { create(:station) }

  describe "slugging" do
    it "should slug name in absence of a slug" do
      station = create(:station, name: 'foo')
      expect(station.slug).to eq 'foo'
    end

    it "should use slug if provided" do
      station = create(:station, name: 'foo', slug: 'bar')
      expect(station.slug).to eq 'bar'
    end
  end
  ...
end

/spec/controllers/stations_controller.rb

describe StationsController do

    ...

    describe "POST create" do
        it "creates a station with a custom slug" do
          valid_attributes[:slug] = 'custom_slug'
          post :create, {:station => valid_attributes}
          get :show, id: 'custom_slug'
          expect(response).to be_success
        end

        ...
    end

    describe "PUT update" do
        it "updates the slug" do
          put :update, {:id => station.to_param, :station => { slug: 'custom_slug' }}
          get :show, id: 'custom_slug'
          expect(response).to be_success
        end

        ...
    end 

    ...
end