I have this modules where I'm trying to define a struct:
defmodule A do
defmodule B do
defstruct :id, :name
end
end
Why error?
undefined function defstruct/2
Why is this error?
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2 Answers
Elixir interprets defstruct :id, :name as calling defstruct with 2 arguments, that's the /2 part in undefined function defstruct/2.
What you want to do is pass a single argument to defstruct, a list of field names:
defmodule A do
defmodule B do
defstruct [:id, :name]
end
end
Comments
Just check the official documentation in that matter.
You can use notation without square brackets, but you have be explicit and provide a keyword list. In example there are default values provided.
In your case :id, :name won't be keyword list and that's why compiler throw an error that you put there two arguments.
If you would do:
defmodule A do
defstruct id: nil, name: nil
end
It would works perfectly fine.
Otherwise use explicitly list.
