Ruby String indexes (indices) — find all indexes in a string

Usage


"aa aaaa    aa".indexes('a') # [0, 1, 3, 4, 5, 6, 11, 12]

Code


class String
  def indexes(needle)
    found = []
    current_index = -1
    while current_index = index(needle, current_index+1)
      found << current_index
    end
    found
  end
end

Fixing corrupt position in acts_as_list

When there is no uniqueness in mysql, things can go wrong….so we fix em…


module ActsAsList
  # positions can get mixed up when users click like crazy -> reorder them if necessary
  # ActsAsList.reorder_positions!(current_user.categories)
  def self.reorder_positions!(objects)
    objects.each_with_index do |object, index|
      new_position = index + 1
      next if object.position == new_position
      object.update_attributes(:position => new_position)
    end
  end
end

sh without rake

Just built this little sh script, that can be used when rake is not installed (we use it to setup a new/clean system)


def sh(cmd)
  puts cmd
  IO.popen(cmd) do |pipe|
    while str = pipe.gets
      puts str
    end
  end
  $?.success?
end

Capistrano reuse tasks for deploy and quickfixes with current_release_or_path

current_release only works in deployment
current_path only works after deployment
latest_release only works when all servers have the same timestamp for ‘latest release’
current_release_or_path is always correct


def current_release_or_path
  exists?(:deploy_timestamped) ? current_release : current_path
end

Hash in response + purge.hash for Varnish 2.1

Varnish 2.1 made req.hash unreadable / does not store it. So purge.hash will no longer work.

Getting hash output back


sub vcl_hash{
  set req.http.X-Hash = req.http.host;
  ... more stuff ...
  set req.http.X-Hash = req.http.X-Hash "#"; # add trailing '#' to be compatible to varnish 2.0
  set req.hash += req.http.X-Hash; # store in unreadable req.hash
  return(hash);
}

sub vcl_deliver {
  ... more stuff ...
  # store hash in response for matching / testing that hashing works
  set resp.http.X-Hash = req.http.X-Hash;
  return (deliver);
}

Purging on hash


varnishadm -T 127.0.0.1:6082 'purge req.http.X-Hash ~ something'

Michael Grosser, the Blog

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