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Introduction

This is a helper plugin to generate ajax based tree structure (two level). It can be used for two models having n:m or 1:n relationships. A leaf from any branch can be dragged and dropped in another branch. A scaffolding arrangement is also done to create a new branch, add leaf etc.

For example:

class Category < ActiveRecord::Base has_many :articles validates_presence_of :name end class Article < ActiveRecord::Base belongs_to :categories validates_presence_of :name end

Installation:

ruby script/plugin install http://ajax-tree.googlecode.com/svn/trunk/ajax_tree/

Here we take the previous example of Category and Article models. Generate the ajax controller for the two models.

Usage

ruby script/generate controller model1 model2

Example

ruby script/generate home category article

Copy static files

Copy add.png, delete.png from /vendor/plugins/ajax_tree/ directory to /public/images directory.

Copy ajax_tree.css file from /vendor/plugins/ajax_tree/ directory to /public/stylesheets/ directory.
Include css in your application layout

< %= stylesheet_link_tag 'ajax_tree' %>

Call the helpers

Specify model names for branch model and leaf model in /views/home/_show_ajax_tree.rhtml partial.

< %= ajax_tree(@branches,{:branch => 'category',:leaf => 'article'})%>

Then, call this partial in any rhtml, where you want to display the ajax tree. In this case, we have done it in /views/home/index.rhtml

home_controller.rb (Generated automatically)

class HomeController < ApplicationController def index @branches = Category.find(:all) end : : : end

index.rhtml

<%= render :partial => 'show_ajax_tree' %>

Contributions:

This project is hosted at http://code.google.com/p/ajax-tree/. Please leave your feedback.

:credits => { :developers => [Ripan Kumar, Sylvain Bonfils, Vincent Spehner, Anup Narkhede], : at => "www.thinkdry.com" }

Last week I was working on a code to make my video files embedding (flv) available for external webpages. There are many ways to implement this and I have documented a simple way to achieve it.

I am using a Video model with file_column plugin to store the flv file. The path of stored flv files is /public/video/file_path/[id]/[filename.flv] in my application. I am using ffmpeg to convert files to flv format but I am not including this module here.

Here is the controller to access the video files from server filesystem.

class VideoController < ApplicationController def index video = Video.find(params[:id]) path = video.file_path filename = path.split('/').last send_data File.open(path).read, :filename => video.id.to_s+".flv", :type => "flv" end def show redirect_to_url "#{SERVER_URL}flvplayer.swf?movieUrl= #{SERVER_URL}video/index/#{params[:id]}" end end

To make this url http://server.com/video/index/[id] to something DRY like http://server.com/v/[id], add this mapping to your routes.rb file.
map.connect ‘v/:id’, :controller => ‘video’, :action => ’show’

The Video model with embed_code method looks as follows:

class Video < ActiveRecord::Base file_column :video_file validates_filesize_of :video_file, :in => 0..1.megabytes validates_file_format_of :video_file, :in => ["mov", "avi", "flv", "wmv"] def embed_code code = "<object width=\"425\" height=\"355\">" code += "<param name=\"movie\" value=\"#{SERVER_URL}/v/#{self.id}\"></param>" code += "<param name=\"wmode\" value=\"transparent\"></param>" code += "<embed src=\"#{SERVER_URL}/v/#{self.id}\" type=\"application/x-shockwave-flash\" wmode=\"transparent\" width=\"425\" height=\"355\"></embed>" code += "</object>" end end

Finally, @video.embed_code gives the code to embed a video as a swf object in external html page.

<object width="425" height="355"> <param name="movie" value="http://server.com/v/1"></param> <param name="wmode" value="transparent"></param> <embed src="http://server.com/v/1" type="application/x-shockwave-flash" wmode="transparent" width="425" height="355"> </embed> </object>