habtm association failure to save in join table with after_create callback.

Can you provide a sample example with complete information so that I could reproduce the problem on my side.

For example look at the way the author of this ticket has given a very clear cut way of reproducing the problem. #4329 has_many through association does not link models on association save

Thanks

Sorry, I do not have a real test case for it yet. (I am new to rails and TDD in general.)

You can recreate the scenario by creating these simplified files:

attachment.rb

(attacment model)

class Attachment < ActiveRecord::Base
  attr_accessor :temp_file
  after_create :save_file

  has_and_belongs_to_many :tags, :uniq => true

  upload_dir
    "/some/path/to/upload/dir/"
  end
  
  # virtual file fields (loaded by controller.)
  # *not actually a column in table.
  def file
    self.temp_file
  end
  def file=(file_field)
    self.file_name = file_field.original_filename
    self.mime_type = file_field.content_type.chomp
    self.file_size = file_field.size.to_i
    # store the file field in temp_file for later processing.
    self.temp_file = file_field
  end

  protected
  # after_create callback.
  def save_file
    self.file_path = "#{upload_dir}/#{self.id}_#{self.file_name}"
    FileUtils.copy self.file.local_path, self.file_path
    self.save!
  end
end

tag.rb

• (Tag model) *

  class Tag < ActiveRecord::Base
  has_and_belongs_to_many :attachments, :uniq => true
  end
  

migration file

class CreateTables < ActiveRecord::Migration
  def self.up
    create_table :attachments do |t|
      t.string :name
      t.string :mime_type
      t.string :file_path
      t.string :file_name
      t.integer :file_size
      t.timestamps
    end
    create_table :tags do |t|
      t.string :name
    end
    create_table :attachments_tags, :id => false do |t|
      t.references :attachment
      t.references :tag
    end
  end
  # add self down code here
end

Now, I am not going to post the view code, but here are the params that I am posting up:

attachment[name] = testfile
attachment[file] = <standard file from file field in view>
attachment[tag_ids][] = 1
attachment[tag_ids][] = 2

Assuming my attachments controller has a create method like this:

def create
  @attachment = Attachment.new params[:attachment]
  if @attachment.save

flash[:notice] = 'Attachment saved.'
redirect_to some_restful_path()

  else

flash.now[:warning] = 'Attachment failed to save.'
render :new

  end
end

You would expect to look in your database after performing this action and see this table:
[attachments_tags]

| attachment_id | tag_id |
|             1 |      1 |
|             1 |      2 |

But you don't. Its empty.
* the model saves the file, and updates the record in the {attachments} table correctly. But the tag_ids are completely ignored.

omega watch