Module: PaperTrailManager::ChangesHelper

Defined in:
app/helpers/paper_trail_manager/changes_helper.rb

Instance Method Summary collapse

Instance Method Details

Returns HTML link for the item stored in the version, e.g. a link to a Company record stored in the version.



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# File 'app/helpers/paper_trail_manager/changes_helper.rb', line 68

def change_item_link(version)
  if (url = change_item_url(version))
    link_to(change_title_for(version), url, class: 'change_item')
  else
    content_tag(:span, change_title_for(version), class: 'change_item')
  end
end

#change_item_types ⇒ Object 



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# File 'app/helpers/paper_trail_manager/changes_helper.rb', line 61

def change_item_types
  ActiveRecord::Base.subclasses.select do |klass|
    klass.include?(PaperTrail::Model::InstanceMethods)
  end.map(&:to_s)
end

#change_title_for(version) ⇒ Object

Returns string title for the versioned record.



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# File 'app/helpers/paper_trail_manager/changes_helper.rb', line 50

def change_title_for(version)
  if PaperTrailManager.item_name_method
    record = version_reify(version) || version.next.try(:reify) || version.item
    name = record.send(PaperTrailManager.item_name_method)
  else
    name = "#{version.item_type} #{version.item_id}"
  end

  h(name)
end

#changes_for(version) ⇒ Object

Return an hash of changes for the given PaperTrail::Version record. The resulting data structure is a hash whose keys are the names of changed columns and values containing a hash with current and previous value. E.g.,:

{
  "my_column_name" => {
    :previous => "past value",
    :current  => "current_value",
  },
  "title" => {
    :previous => "puppies",
    :current  => "kittens",
  },
  ...
}



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# File 'app/helpers/paper_trail_manager/changes_helper.rb', line 29

def changes_for(version)
  case version.event
  when 'create', 'update'
    return {} unless version.changeset

    version.changeset.inject({}) do |changes, (attr, (prev, curr))|
      changes.store(attr, { previous: prev, current: curr }) && changes
    end
  when 'destroy'
    record = version_reify(version)
    return {} unless record

    record.attributes.reject { |_k, v| v.nil? }.inject({}) do |changes, (attr, value)|
      changes.store(attr, { previous: value, current: nil }) && changes
    end
  else
    raise ArgumentError, "Unknown event: #{version.event}"
  end
end

#text_or_nil(object) ⇒ Object

Return HTML representing the object, which is either its text or a stylized “nil”.



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# File 'app/helpers/paper_trail_manager/changes_helper.rb', line 6

def text_or_nil(object)
  if object.nil?
    content_tag('em', 'nil')
  else
    h(object)
  end
end

#version_reify(version) ⇒ Object 



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# File 'app/helpers/paper_trail_manager/changes_helper.rb', line 76

def version_reify(version)
  version.reify
rescue ArgumentError
  nil
end