Class: RedBlocks::Paginator

Inherits:
Object
  • Object
show all
Defined in:
lib/red_blocks/paginator.rb

Defined Under Namespace

Classes: All

Constant Summary collapse

DEFAULT_PER = 
10
DEFAULT_PAGE = 
1

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(per: DEFAULT_PER, page: DEFAULT_PAGE, head: nil, tail: nil) ⇒ Paginator 



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# File 'lib/red_blocks/paginator.rb', line 8

def initialize(per: DEFAULT_PER, page: DEFAULT_PAGE, head: nil, tail: nil)
  if head && tail
    unless head >= 0 && tail >= 0 && head <= tail
      raise ArgumentError.new("head and tail is out of range (head=#{head}, tail=#{tail})")
    end

    @head = head
    @tail = tail
    return
  end

  @per     = per.to_i
  @page    = page.to_i

  @head = @per * (@page - 1)
  @tail = @head + @per - 1
end

Instance Attribute Details

#head ⇒ Object (readonly)

Returns the value of attribute head.



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# File 'lib/red_blocks/paginator.rb', line 6

def head
  @head
end

#page ⇒ Object (readonly)

Returns the value of attribute page.



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# File 'lib/red_blocks/paginator.rb', line 6

def page
  @page
end

#per ⇒ Object (readonly)

Returns the value of attribute per.



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# File 'lib/red_blocks/paginator.rb', line 6

def per
  @per
end

#tail ⇒ Object (readonly)

Returns the value of attribute tail.



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# File 'lib/red_blocks/paginator.rb', line 6

def tail
  @tail
end

Class Method Details

.all ⇒ Object 



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# File 'lib/red_blocks/paginator.rb', line 35

def self.all
  All.new
end

Instance Method Details

#size ⇒ Object 



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# File 'lib/red_blocks/paginator.rb', line 26

def size
  @per || (@tail - @head + 1)
end