238 lines
6.4 KiB
Ruby
238 lines
6.4 KiB
Ruby
class HomeController < ApplicationController
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STORIES_PER_PAGE = 25
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# for rss feeds, load the user's tag filters if a token is passed
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before_filter :find_user_from_rss_token, :only => [ :index, :newest ]
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def index
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@stories = find_stories_for_user_and_tag_and_newest_and_by_user(@user,
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nil, false, nil)
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@rss_link ||= "<link rel=\"alternate\" type=\"application/rss+xml\" " <<
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"title=\"RSS 2.0\" href=\"/rss" <<
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(@user ? "?token=#{@user.rss_token}" : "") << "\" />"
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@heading = @title = ""
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@cur_url = "/"
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respond_to do |format|
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format.html { render :action => "index" }
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format.rss {
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if @user && params[:token].present?
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@title = "Private feed for #{@user.username}"
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end
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render :action => "rss", :layout => false
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}
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format.json { render :json => @stories }
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end
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end
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def newest
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@stories = find_stories_for_user_and_tag_and_newest_and_by_user(@user,
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nil, true, nil)
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@heading = @title = "Newest Stories"
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@cur_url = "/newest"
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@rss_link = "<link rel=\"alternate\" type=\"application/rss+xml\" " <<
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"title=\"RSS 2.0 - Newest Items\" href=\"/newest.rss" <<
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(@user ? "?token=#{@user.rss_token}" : "") << "\" />"
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@newest = true
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respond_to do |format|
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format.html { render :action => "index" }
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format.rss {
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if @user && params[:token].present?
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@title += " - Private feed for #{@user.username}"
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end
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render :action => "rss", :layout => false
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}
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format.json { render :json => @stories }
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end
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end
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def newest_by_user
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for_user = User.where(:username => params[:user]).first!
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@stories = find_stories_for_user_and_tag_and_newest_and_by_user(@user,
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nil, false, for_user.id)
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@heading = @title = "Newest Stories by #{for_user.username}"
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@cur_url = "/newest/#{for_user.username}"
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@newest = true
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@for_user = for_user.username
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render :action => "index"
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end
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def tagged
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@tag = Tag.where(:tag => params[:tag]).first!
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@stories = find_stories_for_user_and_tag_and_newest_and_by_user(@user,
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@tag, false, nil)
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@heading = @title = @tag.description.blank?? @tag.tag : @tag.description
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@cur_url = tag_url(@tag.tag)
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@rss_link = "<link rel=\"alternate\" type=\"application/rss+xml\" " <<
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"title=\"RSS 2.0 - Tagged #{CGI.escape(@tag.tag)} " <<
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"(#{CGI.escape(@tag.description.to_s)})\" href=\"/t/" +
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"#{CGI.escape(@tag.tag)}.rss\" />"
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respond_to do |format|
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format.html { render :action => "index" }
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format.rss { render :action => "rss", :layout => false }
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end
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end
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def privacy
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begin
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render :action => "privacy"
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rescue
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render :text => "<div class=\"box wide\">" <<
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"You apparently have no privacy." <<
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"</div>", :layout => "application"
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end
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end
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def about
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begin
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render :action => "about"
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rescue
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render :text => "<div class=\"box wide\">" <<
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"A mystery." <<
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"</div>", :layout => "application"
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end
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end
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private
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def find_stories_for_user_and_tag_and_newest_and_by_user(user, tag = nil,
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newest = false, by_user = nil)
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@page = 1
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if params[:page].to_i > 0
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@page = params[:page].to_i
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end
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# guest views have caching, but don't bother for logged-in users or dev or
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# when the user has tag filters
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if Rails.env == "development" || user || tags_filtered_by_cookie.any?
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stories, @show_more =
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_find_stories_for_user_and_tag_and_newest_and_by_user(user, tag,
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newest, by_user)
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else
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stories, @show_more = Rails.cache.fetch("stories tag:" <<
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"#{tag ? tag.tag : ""} new:#{newest} page:#{@page.to_i} by:#{by_user}",
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:expires_in => 45) do
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_find_stories_for_user_and_tag_and_newest_and_by_user(user, tag,
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newest, by_user)
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end
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end
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stories
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end
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def _find_stories_for_user_and_tag_and_newest_and_by_user(user, tag = nil,
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newest = false, by_user = nil)
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stories = Story.where(:is_expired => false)
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if user && !(newest || by_user)
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# exclude downvoted items
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stories = stories.where(
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Story.arel_table[:id].not_in(
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Vote.arel_table.where(
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Vote.arel_table[:user_id].eq(user.id)
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).where(
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Vote.arel_table[:vote].lt(0)
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).where(
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Vote.arel_table[:comment_id].eq(nil)
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).project(
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Vote.arel_table[:story_id]
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)
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)
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)
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end
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filtered_tag_ids = []
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if user
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filtered_tag_ids = @user.tag_filters.map{|tf| tf.tag_id }
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else
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# for logged-out users, filter defaults
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filtered_tag_ids = Tag.where(:filtered_by_default => true).
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map{|t| t.id } + tags_filtered_by_cookie.map{|t| t.id }
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end
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if tag
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stories = stories.where(
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Story.arel_table[:id].in(
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Tagging.arel_table.where(
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Tagging.arel_table[:tag_id].eq(tag.id)
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).project(
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Tagging.arel_table[:story_id]
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)
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)
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)
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elsif by_user
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stories = stories.where(:user_id => by_user)
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elsif filtered_tag_ids.any?
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stories = stories.where(
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Story.arel_table[:id].not_in(
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Tagging.arel_table.where(
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Tagging.arel_table[:tag_id].in(filtered_tag_ids)
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).project(
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Tagging.arel_table[:story_id]
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)
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)
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)
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end
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stories = stories.includes(
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:user, :taggings => :tag
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).limit(
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STORIES_PER_PAGE + 1
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).offset(
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(@page - 1) * STORIES_PER_PAGE
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).order(
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newest ? "stories.created_at DESC" : "hotness"
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).to_a
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show_more = false
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if stories.count > STORIES_PER_PAGE
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show_more = true
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stories.pop
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end
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# TODO: figure out a better sorting algorithm for newest, including some
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# older stories that got one or two votes
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if user
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votes = Vote.votes_by_user_for_stories_hash(user.id,
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stories.map{|s| s.id })
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stories.each do |s|
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if votes[s.id]
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s.vote = votes[s.id]
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end
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end
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end
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# eager load comment counts
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if stories.any?
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comment_counts = {}
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Keystore.where(stories.map{|s|
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"`key` = 'story:#{s.id}:comment_count'" }.join(" OR ")).each do |ks|
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comment_counts[ks.key[/\d+/].to_i] = ks.value
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end
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stories.each do |s|
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s._comment_count = comment_counts[s.id].to_i
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end
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end
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[ stories, show_more ]
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end
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end
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