Class: Paginator

Inherits:
Object show all
Defined in:
lib/active_scaffold/paginator.rb,
lib/active_scaffold/extensions/paginator_extensions.rb

Defined Under Namespace

Classes: ArgumentError, MissingCountError, MissingSelectError, Page

Constant Summary

VERSION =
'1.0.9'

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(count, per_page, &select) ⇒ Paginator

Instantiate a new Paginator object

Provide:

  • A total count of the number of objects to paginate

  • The number of objects in each page

  • A block that returns the array of items

    • The block is passed the item offset (and the number of items to show per page, for convenience, if the arity is 2)



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# File 'lib/active_scaffold/paginator.rb', line 22

def initialize(count, per_page, &select)
  @count, @per_page = count, per_page
  unless select
    raise MissingSelectError, "Must provide block to select data for each page"
  end
  @select = select
end

Instance Attribute Details

#countObject (readonly)

Returns the value of attribute count



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# File 'lib/active_scaffold/paginator.rb', line 11

def count
  @count
end

#per_pageObject (readonly)

Returns the value of attribute per_page



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# File 'lib/active_scaffold/paginator.rb', line 11

def per_page
  @per_page
end

Instance Method Details

#eachObject

Iterate through pages



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# File 'lib/active_scaffold/paginator.rb', line 46

def each
  each_with_index do |item, index|
    yield item
  end
end

#each_with_indexObject

Iterate through pages with indices



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# File 'lib/active_scaffold/paginator.rb', line 53

def each_with_index
  1.upto(number_of_pages) do |number|
    yield(page(number), number - 1)
  end
end

#firstObject

First page object



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# File 'lib/active_scaffold/paginator.rb', line 36

def first
  page 1
end

#infinite?Boolean

Is this an “infinite” paginator

Returns:

  • (Boolean)


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# File 'lib/active_scaffold/extensions/paginator_extensions.rb', line 12

def infinite?
  @count.nil?
end

#lastObject

Last page object



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# File 'lib/active_scaffold/paginator.rb', line 41

def last
  page number_of_pages
end

#number_of_pagesObject

Total number of pages



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# File 'lib/active_scaffold/paginator.rb', line 31

def number_of_pages
   (@count / @per_page).to_i + (@count % @per_page > 0 ? 1 : 0)
end

#number_of_pages_with_infiniteObject

Total number of pages



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# File 'lib/active_scaffold/extensions/paginator_extensions.rb', line 6

def number_of_pages_with_infinite
  number_of_pages_without_infinite if @count
end

#page(number) ⇒ Object

Retrieve page object by number



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# File 'lib/active_scaffold/paginator.rb', line 60

def page(number)
  number = (n = number.to_i) > 0 ? n : 1
  Page.new(self, number, lambda { 
    offset = (number - 1) * @per_page
    args = [offset]
    args << @per_page if @select.arity == 2
    @select.call(*args)
  })
end