Class: Liquid::Rails::PaginateTag

Inherits:
Block
  • Object
show all
Defined in:
lib/liquid4-rails/tags/paginate_tag.rb

Constant Summary collapse

Syntax = 
/(#{::Liquid::QuotedFragment})\s*(by\s*(\d+))?/

Instance Method Summary collapse

Constructor Details

#initialize(tag_name, markup, context) ⇒ PaginateTag 



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# File 'lib/liquid4-rails/tags/paginate_tag.rb', line 16

def initialize(tag_name, markup, context)
  super

  if markup =~ Syntax
    @collection_name = $1
    @page_size = if $2
      $3.to_i
    else
      25
    end

    @attributes = { 'window_size' => 3 }
    markup.scan(Liquid::TagAttributes) do |key, value|
      @attributes[key] = value
    end
  else
    raise SyntaxError.new("Syntax Error in tag 'paginate' - Valid syntax: paginate [collection] by number")
  end
end

Instance Method Details

#render(context) ⇒ Object 



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# File 'lib/liquid4-rails/tags/paginate_tag.rb', line 36

def render(context)
  @context = context

  context.stack do
    collection = @context[@collection_name].presence || @context.environments[0][@collection_name]
    raise ::Liquid::ArgumentError.new("Cannot paginate collection '#{@collection_name}'. Not found.") if collection.nil?

    if collection.is_a? Array
      paginated_collection = Kaminari.paginate_array(collection.to_a).page(current_page).per(@page_size)
    elsif collection.respond_to?(:page)
      paginated_collection = collection.page(current_page).per(@page_size)
    end

    page_count = paginated_collection.total_pages
    pagination = {}
    pagination['collection']      = paginated_collection
    pagination['current_offset']  = (current_page-1) * @page_size
    pagination['current_page']    = current_page
    pagination['page_size']       = @page_size
    pagination['pages']           = page_count
    pagination['items']           = paginated_collection.total_count
    pagination['previous']        = link('« Previous'.html_safe, current_page-1 ) unless 1 >= current_page
    pagination['next']            = link('Next &raquo;'.html_safe, current_page+1 )     unless page_count < current_page+1
    pagination['parts']           = []

    hellip_break = false
    if page_count > 1
      1.upto(page_count) do |page|

        if current_page == page
          pagination['parts'] << no_link(page)
        elsif page == 1
          pagination['parts'] << link(page, page)
        elsif page == page_count - 1
          pagination['parts'] << link(page, page)
        elsif page <= current_page - window_size or page >= current_page + window_size
          next if hellip_break
          pagination['parts'] << no_link('&hellip;')
          hellip_break = true
          next
        else
          pagination['parts'] << link(page, page)
        end

        hellip_break = false
      end
    end
    context['paginate'] = pagination

    super
  end
end