mapknitter/app/controllers/feeds_controller.rb

class FeedsController < ApplicationController
  before_filter :query, only: %i(clean license)

  def all
    # (Warpable.all + Map.all).sort_by(&:created_at)
    @maps = Map.find(:all, order: 'id DESC', limit: 20,
                           conditions: { archived: false, password: '' },
                           joins: %i(user warpables),
                           group: 'maps.id')
    render layout: false, template: 'feeds/all'
    response.headers['Content-Type'] = 'application/xml; charset=utf-8'
  end

  def clean
    render layout: false, template: 'feeds/clean'
    response.headers['Content-Type'] = 'application/xml; charset=utf-8'
  end

  def license
    @maps = @maps.where(license: params[:id])
    render layout: false, template: 'feeds/license'
    response.headers['Content-Type'] = 'application/xml; charset=utf-8'
  end

  def author
    @maps = Map.find_all_by_author(params[:id],
      order: 'id DESC',
      conditions: { archived: false, password: '' },
      joins: :warpables, group: 'maps.id')
    images = []
    @maps.each do |map|
      images += map.warpables
    end
    @feed = (@maps + images).sort_by(&:created_at)
    render layout: false, template: 'feeds/author'
    response.headers['Content-Type'] = 'application/xml; charset=utf-8'
  end

  def tag
    @tag = Tag.find_by_name params[:id]
    @maps = @tag.maps.paginate(page: params[:page], per_page: 24)
    render layout: false, template: 'feeds/tag'
    response.headers['Content-Type'] = 'application/xml; charset=utf-8'
  rescue NoMethodError
    render text: "No maps with tag #{params[:id]}"
  end

  private

  def query
    @maps = Map.order(id: :desc)
               .limit(20)
               .where(archived: false, password: '')
               .joins(:warpables)
               .group('maps.id')
  end
end