ruby: no such file to load — gem name (LoadError)

admin — Fri, 30 Mar 2007 14:11:27 +0000

If you are trying to run a script that uses a gem library and you are getting a “LoadError” like this…

ruby: no such file to load — rubyzip (LoadError)

 

…make sure that you have “required” rubygems and also the gem itself, like this:

require ‘rubygems’

require ‘zip/zipfilesystem’

Modifying Plugins - A warning.

admin — Wed, 21 Mar 2007 14:00:06 +0000

I’m just throwing this out there to all rails newbies and anybody who might have forgotten how things work. In either case, I’m sure you might be banging your head against the wall wondering why your modifications to a ruby on rails plugin is not working and most likely doing nothing at all.

If that is the case, it is probably because you MUST restart WEBrick after each change!

The plugins are loaded initially and the code is stored and not accessed again until the server is restarted.

A single form for acts_as_attachment

admin — Tue, 20 Mar 2007 12:50:04 +0000

When I first downloaded the Ruby on Rails plugin acts_as_attachment, I couldn’t understand why the only tutorials I could find did not show how to update the model and the attachment model in the same form. After all, why would you want to put your user through two actions when one would suffice?

I will expand on the DVD Cover example. Some of the code below is blatantly stolen from that tutorial.

Intall the plugin:

> script/plugin source http://svn.techno-weenie.net/projects/plugins

> script/plugin install acts_as_attachment

> rake test_plugins PLUGIN=acts_as_attachment

Generate the Models:

> script/generate model dvd

> script/generate attachment_model dvd_cover

Update your Database:

   create_table :dvd do |t|

      t.column"name", :string

      t.column"studio", :string

      t.column"producer", :string
end
   create_table :dvd_covers do |t|

      t.column "dvd_id", :integer

      t.column "content_type", :string

      t.column "filename", :string

      t.column "size", :integer
      # The following fields are not mandatory.

      t.column "parent_id",  :integer

      t.column "thumbnail", :string

      t.column "width", :integer

      t.column "height", :integer

    end

Edit the Models:

class Dvd < ActiveRecord::Base

  has_one :dvd_cover

end

class DvdCover < ActiveRecord::Base

  belongs_to :dvd

  acts_as_attachment :storage => :file_system

  validates_as_attachment

end

The Controller:

class DvdController < ApplicationController
  def index

    @dvd = Dvd.find(:all)

  end
  def new_dvd

    @dvd = params[:id].nil? ? Dvd.new : Dvd.find(params[:id])

    @dvd_cover = DvdCover.new(params[:dvd_cover])
    if request.post?

      @dvd.attributes = params[:dvd]

      @dvd_cover.attributes = params[:dvd_cover]
      def save_dvd

        Dvd.transaction do

          @dvd.save!

          @dvd_cover.dvd_id = @dvd.id

          @dvd_cover.save!

        end

      end
      redirect_to(:action => "index") and return if save_dvd

    end

  rescue ActiveRecord::RecordInvalid

  end
end

The View:
(app/views/new_dvd.rhtml)

<%= error_messages_for :dvd %>

<%= error_messages_for :dvd_cover %>
<%= form_tag({:action => "new_dvd"}, { :multipart=>true }) %>
for="name">Name:
<%= text_field("dvd", "name", "size" => 50, "maxlength" => 50) %>
for="name">Studio:
<%= text_field("dvd", "studio", "size" => 50, "maxlength" => 50) %>
for="name">Producer:
<%= text_field("dvd", "producer", "size" => 50, "maxlength" => 50) %>
for="name">DVD Cover:
<%= file_field("dvd_cover", "uploaded_data") %>
<%= submit_tag ‘Create DVD’ %>
<%= end_form_tag %>

This will give you 1 form to create the DVD and upload the DVD Cover.

McGinTech

ruby: no such file to load — *gem name* (LoadError)

Modifying Plugins - A warning.

A single form for acts_as_attachment

ruby: no such file to load — gem name (LoadError)