Re: [dragonfly-users] newbie question on dragonfly

[Mark Evans]

Hi

you need to do "rake db:migrate" to add the cover_image_uid= method

however… you said you don't have a physical database?

in that case, you don't need to use models.

You can use fetch_file instead (see http://markevans.github.com/dragonfly/file.GeneralUsage.html)… though this isn't available in 0.6 so you should try to upgrade if you can

On 26 Sep 2012, at 18:22, olegy wrote:

Hello, I'm a complete newbie in Ruby on Rails (.NET person, but have to support Ruby apps for a while).

I've been given a task to display dynamically resized  images from the file system on the web page.

After some reading I decided to use dragonfly.

Due to the current setup, version 0.6 works, the upper ones - blow the server ( not sure from which version it starts crashing)

And Ruby version is 1.8.6-p287 and I cannot change it.

By reading some articles that what I did

Added to the environment.rb

config.gem 'rmagick',    :lib => 'RMagick'

config.gem 'rack-cache', :lib => 'rack/cache'

config.gem 'dragonfly',  :lib => 'dragonfly/rails/images', :source => 'http://gemcutter.org'

Created a class Album in models

class Album < ActiveRecord::Base

  image_accessor :cover_image

end

int the home_controller,rb:

class HomeController < ApplicationController

  def index

    @album = Album.new

    @album.cover_image = File.new('public/images/test.jpg')

  end

end

In the index.html.eb:

<h1>Home</h1>

<br/>

<%= image_tag @album.cover_image.url('400x200') %>

However when I try to display the page. I'm getting

NoMethodError in HomeController#index

undefined method `cover_image_uid=' for #<Album >

 

Thinking it has something to do with Migrations,

I added a class in db folder:

class Album < ActiveRecord::Migration

  def self.up

    add_column :albums, :cover_image_uid, :string  

  end

  def self.down

    remove_column :albums, :cover_image_uid   

  end

end

But the error is still the same.

What I did wrong? There is no physical database, all I need is to read images from the file system

Any help will be appreciated.

Thanks.