AE
Ash Elixir•2w ago
Failz

receiving an Ash Error and don't understand why

question about this error. I'm trying to setup something similar in my app that the Tunez book does. Following an artist, but I'm wanting to like a post. Here's the code 
# post.ex (resource)
has_many :like_relationships, App.Elevate.PostLike

    many_to_many :likes, App.Accounts.User do
      join_relationship :like_relationships
      destination_attribute_on_join_resource :user_id
    end

# post_like.ex (resource)
belongs_to :post, App.Elevate.Post do
      allow_nil? false
      primary_key? true
    end

    belongs_to :user, App.Accounts.User do
      allow_nil? false
      primary_key? true
    end

# user.ex (resource)

has_many :like_relationships, App.Elevate.PostLike do
      destination_attribute :user_id
    end

    many_to_many :liked_posts, App.Elevate.Post do
      join_relationship :like_relationships
      source_attribute_on_join_resource :user_id
    end
# post.ex (resource)
has_many :like_relationships, App.Elevate.PostLike

    many_to_many :likes, App.Accounts.User do
      join_relationship :like_relationships
      destination_attribute_on_join_resource :user_id
    end

# post_like.ex (resource)
belongs_to :post, App.Elevate.Post do
      allow_nil? false
      primary_key? true
    end

    belongs_to :user, App.Accounts.User do
      allow_nil? false
      primary_key? true
    end

# user.ex (resource)

has_many :like_relationships, App.Elevate.PostLike do
      destination_attribute :user_id
    end

    many_to_many :liked_posts, App.Elevate.Post do
      join_relationship :like_relationships
      source_attribute_on_join_resource :user_id
    end
The attached message shows the queries to start to fire off but then runs into an Ash exception.

message.txt

2 Replies
ZachDaniel
ZachDaniel•2w ago
Hummmmm At first glance that looks right to me Maybe silly, but try replacing :user_id with :something_random one at a time until it shows up in the error message, then you know which one is the problem 🙂
ken-kost
ken-kost•2w ago
@Failz try maybe this 👀 
# post.ex (resource)
    has_many :post_likes, App.Elevate.PostLike

    many_to_many :likes, App.Accounts.User do
      through App.Elevate.PostLike
      source_attribute_on_join_resource: :post_id
      destination_attribute_on_join_resource :user_id
    end

# post_like.ex (resource)
    belongs_to :post, App.Elevate.Post do
      allow_nil? false
      primary_key? true
    end

    belongs_to :user, App.Accounts.User do
      allow_nil? false
      primary_key? true
    end

# user.ex (resource)
    has_many :post_likes, App.Elevate.PostLike

    many_to_many :liked_posts, App.Elevate.Post do
      through App.Elevate.PostLike
      source_attribute_on_join_resource :user_id
      destination_attribute_on_join_resource: :post_id
    end
# post.ex (resource)
    has_many :post_likes, App.Elevate.PostLike

    many_to_many :likes, App.Accounts.User do
      through App.Elevate.PostLike
      source_attribute_on_join_resource: :post_id
      destination_attribute_on_join_resource :user_id
    end

# post_like.ex (resource)
    belongs_to :post, App.Elevate.Post do
      allow_nil? false
      primary_key? true
    end

    belongs_to :user, App.Accounts.User do
      allow_nil? false
      primary_key? true
    end

# user.ex (resource)
    has_many :post_likes, App.Elevate.PostLike

    many_to_many :liked_posts, App.Elevate.Post do
      through App.Elevate.PostLike
      source_attribute_on_join_resource :user_id
      destination_attribute_on_join_resource: :post_id
    end
I think :liked_posts used like_relationships destination attribute :user_id which made App.Elevate.Post that it doesn't know that reference

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