What is behind this macro?
Does it defines something like belongs_to :category, has_many :categories ?
kokolegorille
ibarch
Maybe something like this would work?
defmodule WordSolverDal.Categories.Category do
schema "categories" do
has_many :descendant_categories, __MODULE__, foreign_key: :parent_id
end
end
def delete_category(category) do
category
|> Ecto.Changeset.change()
|> Ecto.Changeset.no_assoc_constraint(:descendant_categories,
name: "categories_parent_id_fkey",
message: "there is descendant categor[y|ies] associated with this one"
)
|> Repo.delete()
end
3
kokolegorille
Ok, it’s a plugin from here…
https://github.com/coryodaniel/arbor
You need to define something like this…
schema "categories" do
...
belongs_to :parent, __MODULE__
has_many :categories, __MODULE__
timestamps
end
otherwise it doesn’t know what categories are
=> and add foreign key, as @ibarch said
1
