How to save dynamic number of images using carrierwave

问题

I'm using gem Carrierwave with fog to upload my images to AWS S3.

Right now, I have static memories like this.

class CreateImagePosts < ActiveRecord::Migration
  def change
    create_table :image_posts do |t|
      t.string :img1
      t.string :img2
      t.string :img3
      t.string :img4
      t.string :img5
      t.string :img6
      t.string :img7
      t.string :img8

      t.timestamps null: false
    end
  end
end

But I want to make it possible to upload dynamic numbers of images not like present setting(limited in number of images).

My model looks like this.

class ImagePost < ActiveRecord::Base   

    mount_uploader :img1, S3uploaderUploader
    mount_uploader :img2, S3uploaderUploader
    mount_uploader :img3, S3uploaderUploader
    mount_uploader :img4, S3uploaderUploader
    mount_uploader :img5, S3uploaderUploader
    mount_uploader :img6, S3uploaderUploader
    mount_uploader :img7, S3uploaderUploader
    mount_uploader :img8, S3uploaderUploader

end

Any suggestions or documents that I can read? Thanks.

回答1:

Create model Attachment with has_many relation:

class ImagePost < ActiveRecord::Base
  has_many :attachments
end

class Attachment < ActiveRecord::Base
  belongs_to :image_post
  mount_uploader :img, S3uploaderUploader
end

Migrations:

class CreateAttachments < ActiveRecord::Migration
  def change
    create_table :attachments do |t|
      t.integer :image_post_id
      t.string :img
    end
    add_index :attachments, :image_post_id
  end
end

Now you can create any number of images:

image_post = ImagePost.create
images.each do |image|
  image_post.attachments.create(img: image)
end

来源：https://stackoverflow.com/questions/34471165/how-to-save-dynamic-number-of-images-using-carrierwave

标签

ruby-on-rails-4

carrierwave

dynamic-data