Class: PagedPaginator

Inherits:
JSONAPI::Paginator show all
Defined in:
lib/jsonapi/paginator.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from JSONAPI::Paginator

paginator_for

Constructor Details

#initialize(params) ⇒ PagedPaginator

Returns a new instance of PagedPaginator.


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# File 'lib/jsonapi/paginator.rb', line 125

def initialize(params)
  parse_pagination_params(params)
  verify_pagination_params
end

Instance Attribute Details

#numberObject (readonly)

Returns the value of attribute number


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# File 'lib/jsonapi/paginator.rb', line 123

def number
  @number
end

#sizeObject (readonly)

Returns the value of attribute size


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# File 'lib/jsonapi/paginator.rb', line 123

def size
  @size
end

Class Method Details

.requires_record_countObject


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# File 'lib/jsonapi/paginator.rb', line 130

def self.requires_record_count
  true
end

Instance Method Details

#apply(relation, _order_options) ⇒ Object


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# File 'lib/jsonapi/paginator.rb', line 138

def apply(relation, _order_options)
  offset = (@number - 1) * @size
  relation.offset(offset).limit(@size)
end

#calculate_page_count(record_count) ⇒ Object


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# File 'lib/jsonapi/paginator.rb', line 134

def calculate_page_count(record_count)
  (record_count / @size.to_f).ceil
end

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# File 'lib/jsonapi/paginator.rb', line 143

def links_page_params(options = {})
  record_count = options[:record_count]
  page_count = calculate_page_count(record_count)

  links_page_params = {}

  links_page_params['first'] = {
    'number' => 1,
    'size' => @size
  }

  if @number > 1
    links_page_params['prev'] = {
      'number' => @number - 1,
      'size' => @size
    }
  end

  unless @number >= page_count
    links_page_params['next'] = {
      'number' => @number + 1,
      'size' => @size
    }
  end

  if record_count
    links_page_params['last'] = {
      'number' => page_count == 0 ? 1 : page_count,
      'size' => @size
    }
  end

  links_page_params
end