Simple relationship managing with liveview

Phoenix Forum Questions / Help
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1

I’m warry of getting involved with Ash due to the abstraction it represents, but i wanted to give it a chance since it seems cool and interesting.

I have a couple of small side projects i manage and wanted to try to duplicate one of the simple ones (basically just CRUD with real time updates, a search function, and some user roles stuff). I’m getting stuck on the basics of managing relationships, I’m not sure how much “magic” to expect or what i need to be doing myself but i can’t seem to get the right incantation to get everything working. Granted, I haven’t been able to put much time into this, but I’ve been running through the docs and feel like i’m stuck in a loop.

I have two resources Contacts and Partners. Partners has a one to many with Contacts.

defmodule AshRevenueGenerator.Partners.Contact do
...
actions do
    defaults [:read, :destroy, update: :*]

    create :create do
      primary? true
      accept [:created_by_user_id]

      change relate_actor(:created_by_user)
    end
  end

...

relationships do
    belongs_to :partner, AshRevenueGenerator.Partners.Partner do
      allow_nil? false
      attribute_writable? true
      public? true
    end

    belongs_to :created_by_user, AshRevenueGenerator.Accounts.User do
      allow_nil? false
      attribute_writable? true
    end
  end
...
end

And for the form, I’m just using the one from the generator, with an added select input for the Partner. The public? true on the attributes and the relationship got me for a while, kind of annoying, would be nice if there was a short hand for it (might be, i haven’t be able to find it though). I’ve tried set_attribute in the action and adding the partner_id to the accepts, i’ve tried manage_relationship(:partner, :partner_id) but didn’t stick with that long. I can’t seem to get all the attributes to save for a contact and then to also be able to set the partner from the form at the same time. Current error the form is giving me is that partner is required (which is true but i’m passing in params with a partner_id set)

Long winded, but is there some sort of guide, or tutorial, or documentation I’m missing for this? is there a kind of convention for this simple CRUD or is it more just do whatever feels right? Also, apologies if this has already been asked or solved, i’ve been looking everywhere for a way to solve this and haven’t seen something on this basic level but this was kinda close

2

You only accept the created_by_user_id at the moment, you also need to accept the partner_id and you probably don’t need to accept the created_by_user_id attribute because you don’t pass that directly but use the actor to set the value.

accept [:created_by_user_id, :partner_id]

You don’t need manage_relationship if you set the ids directly.

There is a section in the getting started guide that shows this, it’s using an update action but otherwise it works the same way Get Started — ash v3.4.43

There is also this section about using manage_relationship Relationships — ash v3.4.43

You can also do everything manage_relationship and more using before/after action hooks.

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3

Ah yeah, definitely remember reading those, that works just fine thank you!

Am I still able to use that :* trick in the accept parameters for an action, or the default_accept? It was handy to have but since my create/update actions handle a relationship i don’t think i can do the defaults [:read, :destroy, create: :*, update: :*]

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4

I think it should work. :* stands for all public attributes, and the belongs_to definition adds a public attribute if the relationship is public.

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