cblavier
Struct pattern matching
Hey there 
I have the 2 following structs.
defmodule Variation do
@enforce_keys [:id, :attributes]
defstruct [:id, :description, :attributes, :slots, :block]
end
defmodule VariationGroup do
@enforce_keys [:id, :variations]
defstruct [:id, :description, :variations]
end
I would like to pattern match both structs at once, based on the fact they share similar attributes: :id and :description.
Is this achievable through behaviors?
Marked As Solved
fuelen
Another options:
def test(%module{}) when module in [Variation, VariationGroup], do: ...
def test(term) when is_struct(term, Variation) or is_struct(term, VariationGroup), do: ...
Also Liked
JohnnyCurran
Just treat them as maps:
def my_func(%{id: id, attributes: attributes}) do
# work
end
And if you need to access the underlying module:
def my_func(%{id: id, attributes: attributes} = entity) do
entity.__struct__
end
michallepicki
If you want to share the implementation of a function from a protocol, you can move it to a different module and delegate there from all separate protocol implementations. Or you can create a separate protocol for the shared parts and pass a list of struct modules (or primitive types if applicable) to defimpl.
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