Ruby on rails - model missing required attr_accessor for [RAILS]

Question

I'm using ruby on rails and I have some problem with it !

I tried to create a database but it seems not to work ! I generated a model and a database file thank's to the command:

rails g model photos

And here my codes

photos_controller.rb :

class PhotosController < ApplicationController


  # POST /photos
  # POST /photos.json
  def create
    @photo = Photo.new(photo_params)


photo_controller.rb

    respond_to do |format|
      if @photo.save
        format.html { redirect_to @photo, notice: 'Photo was successfully created.' }
        format.json { render action: 'show', status: :created, location: @photo }
      else
        format.html { render action: 'new' }
        format.json { render json: @photo.errors, status: :unprocessable_entity }
      end
    end
  end

# Never trust parameters from the scary internet, only allow the white list through.
    def photo_params
      params.require(:photo).permit(:image)
    end
end

in the model photo.rb :

class Photo < ActiveRecord::Base
    has_attached_file :image
end

in the file 2011234116731_create_photos.rb :

class CreatePhotos < ActiveRecord::Migration

     def self.up
         add_column :photos, :image_file_name, :string
         add_column :photos, :image_content_type, :string
         add_column :photos, :image_file_size, :string
         add_column :photos, :image_update_at, :string
     end

     def self.down
         remove_column :photos, :image_file_name, :string
         remove_column :photos, :image_content_type, :string
         remove_column :photos, :image_file_size, :string
         remove_column :photos, :image_update_at, :string
     end

end

But when I try to load a page which use an element "image" of the model, I ha the following error :

Photo model missing required attr_accessor for 'image_file_name' Extracted source (around line #27):

POST /photos.json

def create @photo = Photo.new(photo_params) respond_to do |format| if @photo.save

I noticed that the migration seems not to work because in my scheme.rb : ( I've done the rake db:migrate command )

ActiveRecord::Schema.define(version: 20131124183207) do

  create_table "photos", force: true do |t|
    t.datetime "created_at"
    t.datetime "updated_at"
  end

end

DiegoSalazar DiegoSalazar · Accepted Answer · 2013-11-25T16:52:38

Doesn't seem like the migration ran correctly. And it also doesn't look like a migration that would get generated by the rails g model command. It's missing the create_table method. It looks like you previously created the Photo model and then created another migration to add the image fields.

My first hunch would be to try rolling the migration back:

rake db:migrate:down VERSION=2011234116731

Then running rake db:migrate again and check your schema file to make sure all the columns are there.

Ruby on rails - model missing required attr_accessor for [RAILS]

POST /photos.json

1 Answers