allow moderators to edit story urls if they ever had one

app/controllers/stories_controller.rb

@@ -187,7 +187,12 @@ def update
    @story.is_expired = false
    @story.editor_user_id = @user.id

    if @story.update_attributes(params[:story].except(:url))
    @story.attributes = params[:story].except(:url)
    if @story.url_is_editable_by_user?(@user)
      @story.url = params[:story][:url]
    end

    if @story.save
      return redirect_to @story.comments_url
    else
      return render :action => "edit"

app/models/story.rb

@@ -314,19 +314,6 @@ def tagging_changes
    end
  end

  def url=(u)
    # strip out stupid google analytics parameters
    if u && (m = u.match(/\A([^\?]+)\?(.+)\z/))
      params = m[2].split("&")
      params.reject!{|p|
        p.match(/^utm_(source|medium|campaign|term|content)=/) }

      u = m[1] << (params.any?? "?" << params.join("&") : "")
    end

    self[:url] = u
  end

  def title=(t)
    # change unicode whitespace characters into real spaces
    # TODO: remove remove_mb4 hack
@@ -341,10 +328,33 @@ def title_as_url
    u.gsub(/^_+/, "").gsub(/_+$/, "")
  end

  def url=(u)
    # strip out stupid google analytics parameters
    if u && (m = u.match(/\A([^\?]+)\?(.+)\z/))
      params = m[2].split("&")
      params.reject!{|p|
        p.match(/^utm_(source|medium|campaign|term|content)=/) }

      u = m[1] << (params.any?? "?" << params.join("&") : "")
    end

    self[:url] = u
  end

  def url_or_comments_url
    self.url.blank? ? self.comments_url : self.url
  end

  def url_is_editable_by_user?(user)
    if self.new_record?
      true
    elsif user && user.is_moderator? && self.url.present?
      true
    else
      false
    end
  end

  def is_editable_by_user?(user)
    if user && user.is_moderator?
      return true

app/views/stories/_form.html.erb

@@ -2,26 +2,26 @@

<div class="box">
  <div class="boxline">
	<% if !f.object.new_record? && !f.object.url.blank? %>
  <% if f.object.url_is_editable_by_user?(@user) %>
    <%= f.label :url, "URL:", :class => "required" %>
    <div class="d">
		<a href="<%= f.object.url %>"><%= f.object.url %></a>
    </div>
	<% elsif !f.object.id %>
    <%= f.label :url, "URL:", :class => "required" %>
		<%= f.text_field :url, :autocomplete => "off" %>
    <%= f.text_field :url, :autocomplete => "off" %>
    <%= button_tag "Fetch Title", :id => "story_fetch_title",
      :type => "button" %>
	<% end %>
  <% elsif !f.object.new_record? && !f.object.url.blank? %>
    <%= f.label :url, "URL:", :class => "required" %>
    <div class="d">
    <a href="<%= f.object.url %>"><%= f.object.url %></a>
    </div>
  <% end %>
  </div>

  <div class="boxline">
    <%= f.label :title, "Title:", :class => "required" %>
    <%= f.text_field :title, :maxlength => 100, :autocomplete => "off"  %>
	</div>
  </div>

  <div class="boxline" style="margin-bottom: 2px;">
	<%= f.label :tags_a, "Tags:", :class => "required",
  <%= f.label :tags_a, "Tags:", :class => "required",
    :style => "line-height: 2.3em;" %>
  <%= f.select "tags_a", options_for_select(
    Tag.all_with_filtered_counts_for(@user).map{|t|