#
# Pagination is included automatically for all controllers.
#
- # For help rendering pagination links, see
+ # For help rendering pagination links, see
# ActionView::Helpers::PaginationHelper.
#
# ==== Automatic pagination for every action in a controller
#
- # class PersonController < ApplicationController
+ # class PersonController < ApplicationController
# model :person
#
# paginate :people, :order => 'last_name, first_name',
# :per_page => 20
- #
+ #
# # ...
# end
#
# Each action in this controller now has access to a <tt>@people</tt>
# instance variable, which is an ordered collection of model objects for the
- # current page (at most 20, sorted by last name and first name), and a
+ # current page (at most 20, sorted by last name and first name), and a
# <tt>@person_pages</tt> Paginator instance. The current page is determined
# by the <tt>params[:page]</tt> variable.
#
# and <tt>@people</tt> for a single action, and uses the default of 10 items
# per page.
#
- # ==== Custom/"classic" pagination
+ # ==== Custom/"classic" pagination
#
# def list
# @person_pages = Paginator.new self, Person.count, 10, params[:page]
- # @people = Person.find :all, :order => 'last_name, first_name',
+ # @people = Person.find :all, :order => 'last_name, first_name',
# :limit => @person_pages.items_per_page,
# :offset => @person_pages.current.offset
# end
- #
- # Explicitly creates the paginator from the previous example and uses
+ #
+ # Explicitly creates the paginator from the previous example and uses
# Paginator#to_sql to retrieve <tt>@people</tt> from the model.
#
module Pagination
unless const_defined?(:OPTIONS)
# A hash holding options for controllers using macro-style pagination
OPTIONS = Hash.new
-
+
# The default options for pagination
DEFAULT_OPTIONS = {
:class_name => nil,
else
DEFAULT_OPTIONS[:group] = nil
end
-
+
def self.included(base) #:nodoc:
super
base.extend(ClassMethods)
end
-
+
def self.validate_options!(collection_id, options, in_action) #:nodoc:
options.merge!(DEFAULT_OPTIONS) {|key, old, new| old}
valid_options = DEFAULT_OPTIONS.keys
valid_options << :actions unless in_action
-
+
unknown_option_keys = options.keys - valid_options
raise ActionController::ActionControllerError,
"Unknown options: #{unknown_option_keys.join(', ')}" unless
# <tt>:singular_name</tt>:: the singular name to use, if it can't be inferred by singularizing the collection name
# <tt>:class_name</tt>:: the class name to use, if it can't be inferred by
# camelizing the singular name
- # <tt>:per_page</tt>:: the maximum number of items to include in a
+ # <tt>:per_page</tt>:: the maximum number of items to include in a
# single page. Defaults to 10
# <tt>:conditions</tt>:: optional conditions passed to Model.find(:all, *params) and
# Model.count
paginator_and_collection_for(collection_id, options)
end
- # These methods become class methods on any controller
+ # These methods become class methods on any controller
module ClassMethods
# Creates a +before_filter+ which automatically paginates an Active
# Record model for all actions in a controller (or certain actions if
# specified with the <tt>:actions</tt> option).
#
- # +options+ are the same as PaginationHelper#paginate, with the addition
+ # +options+ are the same as PaginationHelper#paginate, with the addition
# of:
# <tt>:actions</tt>:: an array of actions for which the pagination is
# active. Defaults to +nil+ (i.e., every action)
next unless options[:actions].include? action_name if
options[:actions]
- paginator, collection =
+ paginator, collection =
paginator_and_collection_for(collection_id, options)
paginator_name = "@#{options[:singular_name]}_pages"
self.instance_variable_set(paginator_name, paginator)
collection_name = "@#{collection_id.to_s}"
- self.instance_variable_set(collection_name, collection)
+ self.instance_variable_set(collection_name, collection)
end
end
-
+
# Returns the total number of items in the collection to be paginated for
# the +model+ and given +conditions+. Override this method to implement a
# custom counter.
def count_collection_for_pagination(model, options)
- model.count(:conditions => options[:conditions],
- :joins => options[:join] || options[:joins],
- :include => options[:include],
- :select => (options[:group] ? "DISTINCT #{options[:group]}" : options[:count]))
+ collection = model.joins(options[:join] || options[:joins])
+ collection = collection.where(options[:conditions])
+ collection = collection.includes(options[:include])
+
+ if options[:group]
+ collection = collection.select(options[:group]).distinct
+ elsif options[:count]
+ collection = collection.select(options[:count])
+ end
+
+ collection.count
end
-
+
# Returns a collection of items for the given +model+ and +options[conditions]+,
# ordered by +options[order]+, for the current page in the given +paginator+.
# Override this method to implement a custom finder.
def find_collection_for_pagination(model, options, paginator)
- model.find(:all, :conditions => options[:conditions],
- :order => options[:order_by] || options[:order],
- :joins => options[:join] || options[:joins], :include => options[:include],
- :select => options[:select], :limit => options[:per_page],
- :group => options[:group], :offset => paginator.current.offset)
+ collection = model.joins(options[:join] || options[:joins])
+ collection = collection.where(options[:conditions])
+ collection = collection.order(options[:order_by] || options[:order])
+ collection = collection.includes(options[:include])
+ collection = collection.group(options[:group])
+
+ if options[:select]
+ collection = collection.select(options[:select])
+ end
+
+ collection.offset(paginator.current.offset).limit(options[:per_page])
end
-
+
protected :create_paginators_and_retrieve_collections,
:count_collection_for_pagination,
:find_collection_for_pagination
count = count_collection_for_pagination(klass, options)
paginator = Paginator.new(self, count, options[:per_page], page)
collection = find_collection_for_pagination(klass, options, paginator)
-
- return paginator, collection
+
+ return paginator, collection
end
-
+
private :paginator_and_collection_for
# A class representing a paginator for an Active Record collection.
@item_count = item_count || 0
@items_per_page = items_per_page
@pages = {}
-
+
self.current_page = current_page
end
attr_reader :controller, :item_count, :items_per_page
-
+
# Sets the current page number of this paginator. If +page+ is a Page
- # object, its +number+ attribute is used as the value; if the page does
+ # object, its +number+ attribute is used as the value; if the page does
# not belong to this Paginator, an ArgumentError is raised.
def current_page=(page)
if page.is_a? Page
# Returns a new Page representing the last page in this paginator.
def last_page
- @last_page ||= self[page_count]
+ @last_page ||= self[page_count]
end
alias last :last_page
attr_reader :paginator, :number
alias to_i :number
- # Compares two Page objects and returns true when they represent the
+ # 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).
def ==(page)
return false if page.nil?
- @paginator == page.paginator and
+ @paginator == page.paginator and
@number == page.number
end
def offset
@paginator.items_per_page * (@number - 1)
end
-
+
# Returns the number of the first item displayed.
def first_item
offset + 1
end
-
+
# Returns the number of the last item displayed.
def last_item
[@paginator.items_per_page * @number, @paginator.item_count].min
if last? then nil else @paginator[@number + 1] end
end
- # Returns a new Window object for this page with the specified
+ # Returns a new Window object for this page with the specified
# +padding+.
def window(padding=2)
Window.new(self, padding)
def to_sql
[@paginator.items_per_page, offset]
end
-
+
def to_param #:nodoc:
@number.to_s
end
projects / rails.git / blobdiff