module Diffrent

Get a diff between two arbitrary versions of an ActiveRecord object.

@param [Symbol] attr the attribute you want to diff. @param [Integer] old_version the version you want to start your diff at. @param [Integer] new_version the version you want to diff to. @param [Hash] options an options hash allowing you to pass a :format. @return [String] a diff string. If :format was nil, this could be a [Diffy::Diff].

# File lib/diffrent.rb, line 10
def diff_for(attr, old_version, new_version, options={:format => :html})
  changes = self.changes_between(new_version, old_version)
  if changes.key?(attr)
    Diffy::Diff.new(changes[attr].first, changes[attr].last).to_s(options[:format])
  else
    self.send(attr)
  end
end

Are there later versions? @param [Integer] v the version number to check. @return [Boolean] whether there are any versions after version v.

# File lib/diffrent.rb, line 29
def has_versions_after?(v)
  self.versions.at(v + 1)
end

Are there previous versions? @param [Integer] v the version number to check. @return [Boolean] whether there are any versions before version v.

# File lib/diffrent.rb, line 22
def has_versions_before?(v)
  self.versions.at(v - 1)
end