Class: Webby::Paginator

Inherits:
Object
  • Object
show all
Includes:
Enumerable
Defined in:
lib/webby/stelan/paginator.rb

Defined Under Namespace

Classes: ArgumentError, MissingCountError, MissingSelectError, Page

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from Enumerable

#injecting

Constructor Details

#initialize(count, per_page, resource, &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/webby/stelan/paginator.rb', line 32

def initialize(count, per_page, resource, &select)
  @count, @per_page, @resource = count, per_page, resource
  @meta_data = @resource._meta_data.dup
  @filename = @resource.filename
  @directory = @resource.directory
  unless select
    raise MissingSelectError, "Must provide block to select data for each page"
  end
  @select = select
end

Instance Attribute Details

#count ⇒ Object (readonly)

Returns the value of attribute count.



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# File 'lib/webby/stelan/paginator.rb', line 21

def count
  @count
end

#directory ⇒ Object (readonly)

Returns the value of attribute directory.



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# File 'lib/webby/stelan/paginator.rb', line 21

def directory
  @directory
end

#filename ⇒ Object (readonly)

Returns the value of attribute filename.



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# File 'lib/webby/stelan/paginator.rb', line 21

def filename
  @filename
end

#per_page ⇒ Object (readonly)

Returns the value of attribute per_page.



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# File 'lib/webby/stelan/paginator.rb', line 21

def per_page
  @per_page
end

#resource ⇒ Object (readonly)

Returns the value of attribute resource.



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# File 'lib/webby/stelan/paginator.rb', line 21

def resource
  @resource
end

Instance Method Details

#each ⇒ Object 



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# File 'lib/webby/stelan/paginator.rb', line 58

def each
  1.upto(number_of_pages) do |number|
    yield page(number)
  end
end

#first ⇒ Object

First page object



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# File 'lib/webby/stelan/paginator.rb', line 49

def first
  page 1
end

#last ⇒ Object

Last page object



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# File 'lib/webby/stelan/paginator.rb', line 54

def last
  page number_of_pages
end

#number_of_pages ⇒ Object

Total number of pages



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# File 'lib/webby/stelan/paginator.rb', line 44

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

#page(number) ⇒ Object

Retrieve page object by number



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# File 'lib/webby/stelan/paginator.rb', line 65

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

#reset ⇒ Object

Finalizer method that should be called when the paginator is finished



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# File 'lib/webby/stelan/paginator.rb', line 76

def reset
  resource._reset(@meta_data)
end