Class: ActionController::Pagination::Paginator::Page

Inherits:
Object
  • Object
show all
Includes:
Comparable
Defined in:
lib/action_controller/pagination.rb

Overview

A class representing a single page in a paginator.

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(paginator, number) ⇒ Page

Creates a new Page for the given paginator with the index number. If number is not in the range of valid page numbers or is not a number at all, it defaults to 1.


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# File 'lib/action_controller/pagination.rb', line 290

def initialize(paginator, number)
  @paginator = paginator
  @number = number.to_i
  @number = 1 unless @paginator.has_page_number? @number
end

Instance Attribute Details

#numberObject (readonly) Also known as: to_i

Returns the value of attribute number


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# File 'lib/action_controller/pagination.rb', line 295

def number
  @number
end

#paginatorObject (readonly)

Returns the value of attribute paginator


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# File 'lib/action_controller/pagination.rb', line 295

def paginator
  @paginator
end

Instance Method Details

#<=>(page) ⇒ Object

Compares two Page objects and returns -1 if the left-hand page comes before the right-hand page, 0 if the pages are equal, and 1 if the left-hand page comes after the right-hand page. Raises ArgumentError if the pages do not belong to the same Paginator object.

Raises:

  • (ArgumentError)

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# File 'lib/action_controller/pagination.rb', line 311

def <=>(page)
  raise ArgumentError unless @paginator == page.paginator
  @number <=> page.number
end

#==(page) ⇒ Object

Compares two Page objects and returns true when they represent the same page (i.e., their paginators are the same and they have the same page number).


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# File 'lib/action_controller/pagination.rb', line 301

def ==(page)
  return false if page.nil?
  @paginator == page.paginator and 
    @number == page.number
end

#first?Boolean

Returns true if this page is the first page in the paginator.

Returns:

  • (Boolean)

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# File 'lib/action_controller/pagination.rb', line 332

def first?
  self == @paginator.first
end

#first_itemObject

Returns the number of the first item displayed.


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# File 'lib/action_controller/pagination.rb', line 322

def first_item
  offset + 1
end

#last?Boolean

Returns true if this page is the last page in the paginator.

Returns:

  • (Boolean)

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# File 'lib/action_controller/pagination.rb', line 337

def last?
  self == @paginator.last
end

#last_itemObject

Returns the number of the last item displayed.


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# File 'lib/action_controller/pagination.rb', line 327

def last_item
  [@paginator.items_per_page * @number, @paginator.item_count].min
end

#nextObject

Returns a new Page object representing the page just after this page, or nil if this is the last page.


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# File 'lib/action_controller/pagination.rb', line 349

def next
  if last? then nil else @paginator[@number + 1] end
end

#offsetObject

Returns the item offset for the first item in this page.


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# File 'lib/action_controller/pagination.rb', line 317

def offset
  @paginator.items_per_page * (@number - 1)
end

#previousObject

Returns a new Page object representing the page just before this page, or nil if this is the first page.


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# File 'lib/action_controller/pagination.rb', line 343

def previous
  if first? then nil else @paginator[@number - 1] end
end

#to_paramObject

:nodoc:


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# File 'lib/action_controller/pagination.rb', line 364

def to_param #:nodoc:
  @number.to_s
end

#to_sqlObject

Returns the limit/offset array for this page.


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# File 'lib/action_controller/pagination.rb', line 360

def to_sql
  [@paginator.items_per_page, offset]
end

#window(padding = 2) ⇒ Object

Returns a new Window object for this page with the specified padding.


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# File 'lib/action_controller/pagination.rb', line 355

def window(padding=2)
  Window.new(self, padding)
end