I fixed it using old ways, changed migration file as shown
class AddImageColumnsToPicture < ActiveRecord::Migration
def self.up
add_column :pictures, :image_file_name, :string
add_column :pictures, :image_content_type, :string
add_column :pictures, :image_file_size, :integer
add_column :pictures, :image_updated_at, :datetime
end
def self.down
remove_column :pictures, :image_file_name
remove_column :pictures, :image_content_type
remove_column :pictures, :image_file_size
remove_column :pictures, :image_updated_at
end
end
It looks bulky, but works. i must upgrade to newest gem and see if the
short version works.
On Jan 13, 7:26 pm, Walter Lee Davis <[email protected]> wrote:
> On Jan 13, 2012, at 4:44 AM, Karthikeyan wrote:
>
>
>
>
>
>
>
>
>
> > Hello people,
>
> > I installed paperclip gem with these following lines in gem file
>
> > gem 'rmagick'
> > gem "paperclip", "~> 2.0"
> > gem 'aws-s3'
>
> > I am using amazon S3.
>
> > the problem came when I ran the migration which had the following
> > migration code
>
> > class AddImageColumnsToPicture < ActiveRecord::Migration
> > def self.up
> > change_table :pictures do |t|
> > t.has_attached_file :image
> > end
> > end
>
> > def self.down
> > drop_attached_file :pictures, :image
> > end
> > end
>
> > It gave the following error:
>
> > An error has occurred, this and all later migrations canceled:
>
> > undefined method `has_attached_file' for
> > #<ActiveRecord::ConnectionAdapters::Table:0xb414d98>
>
> > Any one knows how to fix it?
>
> See if updating to the newest gem fixes it. (2.4.5 at the moment). I don't
> recall seeing that helpful migration method the last time I used Paperclip,
> so it may be newer than your gem.
>
> Walter
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