Oh, and this drove me crazy… naming the method “paginate_by_tag” won’t work, because will_paginate, being too clever for its own good, will intercept the method_missing call before it gets to the module and look for find_all_by_tag. I renamed the method to _paginate_by_tag to get around this (I know there must be a more elegant solution).

module ActiveRecord
module Acts #:nodoc:
module Taggable #:nodoc:
module SingletonMethods

def count_tagged_with(*args)
options = find_options_for_find_tagged_with(*args)
options.blank? ? 0 : count(”#{table_name}.id”, options.merge(:select => nil, :distinct => true))
end

def _paginate_tagged_with(tags, options = {})
page, per_page = wp_parse_options!(options)
offset = (page.to_i - 1) * per_page
count = count_tagged_with(tags, options)
options.merge!(:offset => offset, :limit => per_page.to_i)
items = find_tagged_with(tags, options)
returning WillPaginate::Collection.new(page, per_page, count) do |p|
p.replace items
end
end

end
end
end
end

<%= will_paginate @members %>

Result: something like
« Previous 1 2 3 4 5 6 7 8 9 10 11 Next »

Result: something like
« Previous 1 2 3 4 5 6 7 8 9 10 11 Next »

@entries = Entry.paginate_by_tag @tag.name,
:order => ‘entries.created_at DESC’,
:page => params[:page],
:per_page => 20

Now, how do I get to the next page? What’s the code in the view? Can anyone help me? Thanks!

Now I wanted the field ‘lemma’ of my database (an old german dictionary) alphabetically sorted. Following http://www.railsenvy.com/2007/2/19/acts-as-ferret-tutorial
to rebuild the index, I finally wrote in (or copied into) the Controller:

sorter = Ferret::Search::SortField.new(:lemma_for_sort, :reverse => false)
@members = Member.paginate_search params[:query],
:page => params[:page] ,
:per_page => 25,
:sort => sorter

“lemma_for_sort” (in the tutorial “title_for_sort”): a method defined in the model - see tutorial.

Oh wonder, it works! But only thanks to the great help of Geoffrey and his commentators.

module ActiveRecord
module Acts #:nodoc:
module Taggable #:nodoc:
module SingletonMethods
# paginate a call to find_tagged_with
# tag is the tag to find
# options is the option to use for pagination (:page, :per_page) and for find_tagged_with
def paginate_by_tag(tag, options = {})
page, per_page, total = wp_parse_options!(options)
if(options[:conditions].blank?)
counts = tag_counts(:conditions => sanitize_sql(”tags.name = ‘” + tag + “‘”))
else
counts = tag_counts(:conditions => sanitize_sql(options[:conditions] + ” and tags.name = ‘” + tag + “‘”))
end

count = 0
count = counts[0].count if counts.size == 1

offset = (page.to_i - 1) * per_page
options.merge!(:offset => offset, :limit => per_page.to_i)
items = find_tagged_with(tag, options)
returning WillPaginate::Collection.new(page, per_page, count) do |p|
p.replace items
end
end
end
end
end
end