Class: E9Tags::Rack::TagContextAutoCompleter

Inherits:
Object
  • Object
show all
Defined in:
lib/e9_tags/rack/tag_context_auto_completer.rb

Constant Summary collapse

DEFAULT_LIMIT = 
10

Class Method Summary collapse

Class Method Details

.call(env) ⇒ Object 



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# File 'lib/e9_tags/rack/tag_context_auto_completer.rb', line 5

def self.call(env)
  if env["PATH_INFO"] =~ /^\/autocomplete\/tag\-contexts/
    terms = []

    if @term = Rack::Request.new(env).params['term']

      taggings = ::Tagging.arel_table

      relation = taggings.
                 group(taggings[:context]).
                 where(taggings[:context].matches("#{@term}%")).
                 project(taggings[:context], taggings[:context].count.as('count')).
                 take(DEFAULT_LIMIT).
                 order('context ASC')

      # NOTE this select is stolen from Arel::SelectManager's deprecated to_a method, but since Arel has been re-written
      #      (and even before that) it'd probably be smarter here to avoid arel tables and just use AR and to_json
      #   
      terms = ::ActiveRecord::Base.connection.send(:select, relation.to_sql, 'Tag Context Autocomplete').map do |row| 
        unescaped_context = E9Tags.unescape_context(row['context'])

        { :label => "#{unescaped_context} - #{row['count']}", :value => unescaped_context, :count => row['count'] }
      end
    end

    [200, {"Content-Type" => "application/json", "Cache-Control" => "max-age=3600, must-revalidate"}, [terms.to_json]]
  else
    [404, {"Content-Type" => "text/html", "X-Cascade" => "pass"}, ["Not Found"]]
  end
end