Class: Pagy::Countless

Inherits:
Pagy
  • Object
show all
Includes:
CountlessOverflow
Defined in:
lib/pagy/countless.rb

Constant Summary

Constants inherited from Pagy

COUNTLESS, VARS, VERSION

Instance Attribute Summary

Attributes inherited from Pagy

#count, #from, #items, #last, #next, #offset, #page, #pages, #prev, #to, #vars

Instance Method Summary collapse

Methods inherited from Pagy

#overflow?, #responsive, root, #series, #to_h

Constructor Details

#initialize(vars = {}) ⇒ Countless

Merge and validate the options, do some simple arithmetic and set a few instance variables



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# File 'lib/pagy/countless.rb', line 8

def initialize(vars={})
  @vars ||= VARS.merge(vars.delete_if{|_,v| v.nil? || v == '' })    # default vars + cleaned vars (can be overridden)
  { items:1, outset:0, page:1 }.each do |k,min|                     # validate instance variables
    (@vars[k] && instance_variable_set(:"@#{k}", @vars[k].to_i) >= min) \
     or raise(ArgumentError, "expected :#{k} >= #{min}; got #{@vars[k].inspect}")
  end
  @offset = @items * (@page - 1) + @outset                          # pagination offset + outset (initial offset)
end

Instance Method Details

#finalize(fetched) ⇒ Object

Finalize the instance variables based on the fetched items



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# File 'lib/pagy/countless.rb', line 18

def finalize(fetched)
  fetched == 0 && @page > 1 and raise(OverflowError.new(self), "page #{@page} got no items")
  @pages = @last = (fetched > @items ? @page + 1 : @page)         # set the @pages and @last
  @items = fetched if fetched < @items && fetched > 0             # adjust items for last non-empty page
  @from  = fetched == 0 ? 0 : @offset+1 - @outset                 # page begins from item
  @to    = fetched == 0 ? 0 : @offset + @items - @outset          # page ends to item
  @prev  = (@page-1 unless @page == 1)                            # nil if no prev page
  @next  = @page == @last ? (1 if @vars[:cycle]) : @page+1        # nil if no next page, 1 if :cycle
  self
end