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

Returns a new instance of PaginateTag.



16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
 
# 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 



36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
 
# 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