Thanks for the tip Wojtek
Aliasing __MODULE__ should work in my case
As far as I understand this pattern isn't used too often(at least projects
like Plug or Ecto don't use it), so I guess it is not really considered as
idiomatic
I just feel that if you are inside a module there should be a shortcut
built-in in the language(like when you call other functions from the module
you don't specify the full path) but it might be just old instincts from
other languages
пʼятниця, 21 січня 2022 р. о 10:58:56 UTC Wojtek Mach пише:
> Neither `%_{}` nor `%self{}` can be supported because they already have a
> meaning in pattern matches. The former means _any_ struct and the latter
> binds the matched struct name to the variable `self`.
>
> You can give `__MODULE__` another name with an alias:
>
> alias __MODULE__, as: Struct
>
> def connect(%Struct{} = channel)
>
>
> On January 21, 2022, "gmail.com" <ins...@gmail.com> wrote:
>
> It is common to define a struct together with various functions that
> access that struct in the module:
>
> defmodule Chat.Channel do
> defstruct name: "", public?: true
>
> def new do
> %Chat.Channel{name: "Untitled"}
> end
>
> def connect(%Chat.Channel{} = channel) do
> IO.inspect(channel)
> end
> end
>
> It is also common to alias the struct for easier access
>
> defmodule Chat.Channel do
> defstruct name: "", public?: true
>
> alias Chat.Channel
>
> # ...
> end
>
> But, say, renaming the module would require manually replacing all struct
> occurrences with the new module name. Aliasing can help, but if the last
> bit should be updated too(say Chat.Channel should be updated to Chat.Room)
> it would still require to manually replace everything.
>
> There is a workaround to use __MODULE__, but IMO the code looks a bit ugly
>
> defmodule Chat.Channel do
> defstruct name: "", public?: true
>
> def new do
> %__MODEUL__{name: "Untitled"}
> end
>
> def connect(%__MODEUL__{} = channel) do
> IO.inspect(channel)
> end
> end
>
> I think It would be great to have some kind of shortcut(syntactic sugar)
> to access the struct within the module.
> First I thought about something like %_(%%, %. etc) but this way it looks
> a bit cryptic
>
> def connect(%_{} = channel) do
>
> So maybe something like %self would work
>
> defmodule Chat.Channel do
> defstruct name: "", public?: true
>
> def new do
> %self{name: "Untitled"}
> end
>
> def connect(%self{} = channel) do
> IO.inspect(channel)
> end
> end
>
> What do you think?
>
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