Attaching multiple images to Arc.Ecto model about arc

[secretfader]

@nav301186 In your User model, add:

schema "users" do
  has_many :images, LoginService.UserImage
end

This is a normal one-to-many relationship in Ecto. Nothing fancy. Then, in the Avatar model:

schema "user_images" do
  belongs_to :user, LoginService.User
  field :avatar, LoginService.Avatar.Type
end

Obviously, you'll need to create a table for user_images. This will allow you to attach many different UserImages to a given User, and manage the relationship just like you normally would in Ecto. If you're using Phoenix, you can add the relationship via a generator, like so: mix phoenix.gen.model UserImage user_images user_id:references:user avatar:string.

It might be possible to use embedded schemas (rather than a separate table), but I'm not sure Arc supports this method.

@stavro I assume we can close this now. I hope the above was correct and helpful.

[MikeAndrianov]

Same thing 😢

[stavro]

In general, when you have a one-to-many (one user can have many images) type of relationship, the images should be extracted into their own model. In this way, you'll create a first class Image (or Attachment) model, which has a user_id and a file attribute. Each image record will have it's own scoped image.

And since these new records are meaningless without their saved attachment, I would also recommend using a UUID type of identifier for the file name.

Approximately how many images will you have scoped to each model? There are a few different ways of doing this, and I can possibly help put together a demo for it.

[naveen-negi]

Thanks, I need to use 4-5 images per user. Demo would be great !!!

[Morganjackson]

@nicholaswyoung Thanks for this example! I

I Was able to get a single image saving, but I cant figure out how to get it to work with <%= file_input df, :image, multiple: true %>

Do you know if I need to adjust my controller to handle multiple files?

This is my create action:

def create(conn, %{"post" => post_params}) do
  changeset = Post.changeset(%Post{}, post_params)

  case Repo.insert(changeset) do
    {:ok, _post} ->
      conn
      |> put_flash(:info, "Post created successfully.")
      |> redirect(to: admin_post_path(conn, :index))
    {:error, changeset} ->
      render(conn, "new.html", changeset: changeset)
  end
end

Which works fine without multiple: true but I get the following when attempting to upload multiple images:

Request: POST /admin/posts ** (exit) an exception was raised: ** (FunctionClauseError) no function clause matching in Arc.Actions.Store.store/2 lib/arc/actions/store.ex:8: Arc.Actions.Store.store(Ap.BlogPost, [%Plug.Upload{content_type: "image/png", filename: "demo-1920x1200.png", path: "/var/folders/3l/j0tny20n2qg0n5zd6rwx8whr0000gn/T//plug-1482/multipart-557305-982633-1"}, %Plug.Upload{content_type: "image/jpeg", filename: "photo-1461611034385-e082102d5c75.jpeg", path: "/var/folders/3l/j0tny20n2qg0n5zd6rwx8whr0000gn/T//plug-1482/multipart-557305-999697-1"}, %Plug.Upload{content_type: "image/jpeg", filename: "photo.JPG", path: "/var/folders/3l/j0tny20n2qg0n5zd6rwx8whr0000gn/T//plug-1482/multipart-557306-7062-1"}])

[sc0ttman]

@Morganjackson Were you ever able to get it working with file_input ... multiple: true?