Class: GearedPagination::PortionAtOffset

Inherits:
Object
  • Object
show all
Defined in:
lib/geared_pagination/portions/portion_at_offset.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(page_number: 1, per_page: Ratios.new) ⇒ PortionAtOffset

Returns a new instance of PortionAtOffset.



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# File 'lib/geared_pagination/portions/portion_at_offset.rb', line 7

def initialize(page_number: 1, per_page: Ratios.new)
  @page_number, @ratios = page_number, per_page
end

Instance Attribute Details

#page_number ⇒ Object (readonly)

Returns the value of attribute page_number.



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# File 'lib/geared_pagination/portions/portion_at_offset.rb', line 5

def page_number
  @page_number
end

#ratios ⇒ Object (readonly)

Returns the value of attribute ratios.



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# File 'lib/geared_pagination/portions/portion_at_offset.rb', line 5

def ratios
  @ratios
end

Instance Method Details

#cache_key ⇒ Object 



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# File 'lib/geared_pagination/portions/portion_at_offset.rb', line 31

def cache_key
  "#{page_number}:#{ratios.cache_key}"
end

#from(scope) ⇒ Object 



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# File 'lib/geared_pagination/portions/portion_at_offset.rb', line 11

def from(scope)
  scope.limit(limit).offset(offset)
end

#limit ⇒ Object 



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# File 'lib/geared_pagination/portions/portion_at_offset.rb', line 15

def limit
  ratios[page_number]
end

#next_param ⇒ Object 



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# File 'lib/geared_pagination/portions/portion_at_offset.rb', line 26

def next_param(*)
  page_number + 1
end

#offset ⇒ Object 



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# File 'lib/geared_pagination/portions/portion_at_offset.rb', line 19

def offset
  variable = [(page_number - 1), ratios.size - 1].min.times.sum { |index| ratios[index + 1] }
  fixed = [page_number - ratios.size, 0].max * ratios.fixed

  variable + fixed
end