Module: Sequel::Plugins::Tags::InstanceMethods

Defined in:
lib/cortex_reaver/support/tags.rb

Instance Method Summary collapse

Instance Method Details

#after_save ⇒ Object

If tags have changed, make sure to update those tags’ counts.



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# File 'lib/cortex_reaver/support/tags.rb', line 42

def after_save
  return false if super == false

  if @added_tags
    @added_tags.each do |tag|
      tag.count += 1
      tag.save
    end
    @removed_tags.each do |tag|
      tag.count -= 1
      tag.save
    end
  end

  true
end

#before_destroy ⇒ Object

Remove tags on deletion



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# File 'lib/cortex_reaver/support/tags.rb', line 60

def before_destroy
  return false unless super

  tags.each do |tag|
    tag.count -= 1
    if tag.count == 0
      tag.destroy
    else
      tag.save
    end
  end
  remove_all_tags

  true
end

#related_by_tags ⇒ Object

Finds related models by tags.



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# File 'lib/cortex_reaver/support/tags.rb', line 77

def related_by_tags
  # Find map between this model and tags, e.g. pages_tags
  reflection = self.association_reflection(:tags)
  map = reflection[:join_table]
  own_id = reflection[:left_key]
  tags = self.tags.map(:id)
  self.class.filter(
    CortexReaver.db[map].filter(:tag_id => tags).group_and_count(own_id).reverse.map(:photograph_ids)
  )
end

#tags=(tags) ⇒ Object

Set tags from a string, or array of tags. Finds existing tags or creates new ones. Also updates tag counts.



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# File 'lib/cortex_reaver/support/tags.rb', line 90

def tags=(tags)
  if tags.kind_of? String
    tags = tags.squeeze(',').split(',').map do |title|
      title.strip!
      if title.blank?
        # Do nothing
        tag = nil
      else
        # Look up existing tag
        tag = CortexReaver::Tag[:title => title]
        # Or create new one
        tag ||= CortexReaver::Tag.create(:title => title, :name => CortexReaver::Tag.canonicalize(title))
        unless tag
          # Everything failed
          raise RuntimeError.new("couldn't find or create tag for #{title}")
        end
      end
      tag
    end
  end

  unless tags.respond_to? :each
    raise ArgumentError.new("Needed a string or Enumerable of Tags, got #{tags.class}")
  end

  # Get rid of empty tags
  tags.reject do |tag|
    tag.nil?
  end
  tags.uniq!

  # Find which tags to change. Their counts are updated by an after_save
  # callback.
  old_tags = self.tags
  @removed_tags = old_tags - tags
  @added_tags = tags - old_tags

  # Change own tags
  remove_all_tags
  tags.each do |tag|
    add_tag tag
  end
end