Archive for August, 2006

Deprecated Finders in Rails 1.1.5

These Finders are deprecated

  • find_first [use find(:first)]
  • find_all [use find(:all)]
  • find_on_conditions [use find(:conditions)]
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August 23, 2006 at 12:40 pm Leave a comment

Ajax pagination links: Create pagination links with link_to_remote

Here is a method by mixonix to create pagination links by link_to_remote. Copy this code in your helpers/application_helper.rb


def ajax_pagination_links(paginator, options={})

options.merge!(ActionView::Helpers::PaginationHelper::DEFAULT_OPTIONS) {|key, old, new| old}
  window_pages = paginator.current.window(options[:window_size]).pages
  return if window_pages.length <= 1 unless
         options[:link_to_current_page]

first, last = paginator.first, paginator.last

returning html = '' do
    if options[:always_show_anchors] and not window_pages[0].first?
      html << link_to_remote(first.number, :update => options[:update], :url => { options[:name] => first }.update(options[:params] ))
      html << ' ... ' if window_pages[0].number - first.number > 1
      html << ' '
    end

window_pages.each do |page|
      if paginator.current == page && !options[:link_to_current_page]
        html << page.number.to_s
      else
        html << link_to_remote(page.number, :update => options[:update], :url => { options[:name] => page }.update(options[:params] ))
      end
      html << ' '
    end

if options[:always_show_anchors] && !window_pages.last.last?
      html << ' ... ' if last.number - window_pages[-1].number > 1
      html << link_to_remote(paginator.last.number, :update => options[:update], :url => { options[:name] => last }.update( options[:params]))
    end
  end
end

and use following code for creating links


        <%= ajax_pagination_links @pages, {:params => {:search_query => @params[:search_query]} } %>

August 16, 2006 at 3:35 pm 7 comments

Tab Problem in rails .rhtml files

The situation was: running Ruby 1.8.4, Rails 1.1.2, on WinXP & WEBrick server.

My application was working fine, but as I installed Rmagick my application crashed.
I got strange errors like:

compile error /script/../config/../app/views/layouts/application.rhtml:18: parse error, unexpected $, expecting kEND

if I refresh again the error actually changes(further refreshes flip back & forth between errors):

compile error

/script/../config/../app/views/layouts/application.rhtml:18: Invalid char `01′ in expression

./script/../config/../app/views/layouts/application.rhtml:19: parse error, unexpected tCONSTANT, expecting kEND

./script/../config/../app/views/layouts/application.rhtml:20: parse error, unexpected tCONSTANT, expecting kEND

./script/../config/../app/views/layouts/application.rhtml:21: Invalid char `06′ in expression

./script/../config/../app/views/layouts/application.rhtml:21: parse error, unexpected $, expecting kEND

Then my colleagues told me the root of this problem, this was because of tabs in .rhtml files. Also they told me the simple solution:

Put template = template.gsub(/\t/, ” “)  in your

\vendor\rails\actionpack\lib\action_view\base.rb file at line 496 as very first line of def compile_template
Restart webserver and you are done….

August 10, 2006 at 2:51 pm 6 comments

converting all newline characters to br tag

I was surprised as there is no function in ruby to convert all newline characters to <br>.

Here is a php nl2br equivalent method to convert all newline characters (\n) to break tag (<br>) in a string.

 def nl2br(s)
     s.gsub(/\n/, '<br>')
 end

August 7, 2006 at 10:48 am 15 comments


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