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module WillPaginate
# Arrays returned from paginating finds are, in fact, instances of this.
# You may think of WillPaginate::Collection as an ordinary array with some
# extra properties. Those properites are used by view helpers to generate
# correct page links.
#
class Collection < Array
attr_reader :current_page, :per_page
attr_accessor :total_entries
# These collection objects are instantiated by ActiveRecord paginating
# finders; there is no need to do it manually.
#
def initialize(page, per_page, total)
@current_page = page.to_i
@per_page = per_page.to_i
@total_entries = total.to_i
@total_pages = (@total_entries / @per_page.to_f).ceil
end
# The total number of pages.
def page_count
@total_pages
end
# Current offset of the paginated collection. If we're on the first page,
# it is always 0. If we're on the 2nd page and there are 30 entries per page,
# the offset is 30. This property is useful if you want to render ordinals
# besides your records: simply start with offset + 1.
#
def offset
(current_page - 1) * per_page
end
# current_page - 1 or nil if there is no previous page
def previous_page
current_page > 1 ? (current_page - 1) : nil
end
# current_page + 1 or nil if there is no next page
def next_page
current_page < page_count ? (current_page + 1) : nil
end
end
end
Version data entries
13 entries across 13 versions & 4 rubygems